Sample Assessment Material
Edexcel Level 1/Level 2 Certificate in Biology (KBI0)
Edexcel Level 1/Level 2 Certificate in Chemistry (KCH0)
Edexcel Level 1/Level 2 Certificate in Physics (KPH0)
Edexcel Level 1/Level 2 Certificate in Science
(Double Award) (KSC0)
First examination June 2012
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Prepared by Jo Harland
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All the material in this publication is copyright © Pearson Education Limited 2012
Level 1/Level2 Certificate
Biology (KBI0)
Sample Assessment Material
First examination June 2012
Contents
Paper 1B
Sample Assessment Material
Sample Mark Scheme
3
33
Paper 2B
Sample Assessment Material
Sample Mark Scheme
Edexcel Certificate in Biology
45
61
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1
General Marking Guidance
x
All candidates must receive the same treatment. Examiners must
mark the first candidate in exactly the same way as they mark the
last.
x
Mark schemes should be applied positively. Candidates must be
rewarded for what they have shown they can do rather than
penalised for omissions.
x
Examiners should mark according to the mark scheme not according
to their perception of where the grade boundaries may lie.
x
There is no ceiling on achievement. All marks on the mark scheme
should be used appropriately.
x
All the marks on the mark scheme are designed to be awarded.
Examiners should always award full marks if deserved, ie if the
answer matches the mark scheme. Examiners should also be
prepared to award zero marks if the candidate’s response is not
worthy of credit according to the mark scheme.
x
Where some judgement is required, mark schemes will provide the
principles by which marks will be awarded and exemplification may
be limited.
x
When examiners are in doubt regarding the application of the mark
scheme to a candidate’s response, the team leader must be
consulted.
x
Crossed out work should be marked UNLESS the candidate has
replaced it with an alternative response.
Biology Marking notation:
eq = equivalent
Compare i.e. range of values / variable present or absent
Organism i.e. same species / size / age / sex
Replication i.e. more than one reading
Measure i.e. the time between readings / time delay AND units / what is
measured
Same i.e. variables controlled to ensure fair test e.g. temperature /
light intensity
2
Edexcel Certificate in Biology
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Write your name here
Surname
Other names
Edexcel
Certificate
Centre Number
Candidate Number
Biology
Paper: 1B
Sample Assessment Material
Time: 2 hours
Paper Reference
KBI0/1B
You must have:
Ruler
Total Marks
Instructions
black ink or ball-point pen.
t Use
in the boxes at the top of this page with your name,
t Fill
centre number and candidate number.
all questions.
t Answer
the questions in the spaces provided
t Answer
– there may be more space than you need.
t Show all the steps in any calculations and state the units.
Information
total mark for this paper is 120.
t The
marks for each question are shown in brackets
t The
– use this as a guide as to how much time to spend on each question.
Advice
Read each question carefully before you start to answer it.
t Keep
on the time.
t Write anyoureyeanswers
and in good English.
t Try to answer everyneatly
t Check your answersquestion.
if you have time at the end.
t
Turn over
S41083A
©2011 Edexcel Limited.
Edexcel Certificate in Biology
*S41083A0129*
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3
Answer ALL questions.
1 Organisms can be classified into groups, depending on some of their features.
(a) Some scientists were working in the rainforest in Indonesia.
They found two organisms living in the water in a pond.
Organism A was visible by eye, had fins for swimming and a mouth for feeding.
Organism B was a single-celled organism. This cell had a nucleus but no chitin
cell wall.
animals
bacteria
fungi
plants
protoctists
viruses
Use a word from the box to complete each of the following sentences.
(i)
Organism A belongs to the group called .................................................................................................
(1)
(ii) Organism B belongs to the group called .................................................................................................
(1)
(b) Give three structural differences between plant cells and animal cells.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) Explain how fungi obtain their food.
(3)
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(Total for Question 1 = 8 marks)
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2 The animal cell below has a diploid number of eight. The cell is dividing by mitosis.
A
B
C
(a) Name the parts labelled A, B and C.
(3)
A
. . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ . . . . . . . . . . . . . . . . . .
B
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C
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(b) A student wrote this passage describing mitosis. There are two mistakes.
The diploid number of this cell is 8. It will divide into
four daughter cells, each with a diploid number of 8.
Mitosis is a very important type of cell division for
growth, repair, cloning and sexual reproduction.
Identify the two mistakes in the passage.
(2)
1
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2
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(c) What is the diploid number in a human body cell?
(1)
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(Total for Question 2 = 6 marks)
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3 A student carried out an investigation to find out how temperature affects movement
in beetles. The student placed a beetle in a plastic dish, which was allowed to float on
water in a water bath. The water bath was set at a temperature of 15qC.
The apparatus the student used is shown in the diagram below.
sheet of glass
plastic dish
beetle
water bath
water
The student wanted to measure the distance moved in cm by the beetle in one
minute. To do this, the student looked down from the top and recorded the
movement of the beetle on the sheet of glass using a pen. The student did this four
times (trials).
The whole procedure was carried out at five different temperatures using the same
beetle.
The diagrams show the pen recordings for the beetle’s movement during one minute
at 25qC.
6
Trial 1
Trial 2
Trial 3
Trial 4
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(a) Table 1 shows the results obtained for all trials at 15 qC, 20 qC, 30 qC and 35 qC.
(i)
Measure the distance moved in cm by the beetle during trial 4 at 25 qC.
Write your answer in the empty box in Table 1.
(1)
Table 1
Distance moved in cm in one minute
Temperature
in qC
Trial 1
Trial 2
Trial 3
Trial 4
15
2.4
2.1
1.8
1.7
20
4.3
4.1
4.4
4.0
25
6.2
6.0
6.0
30
7.0
6.7
6.9
6.6
35
8.3
8.4
8.1
8.0
(ii) Calculate the average distance moved in cm by the beetle at 35qC.
Show your working.
(2)
Answer ..................................................................... cm
(b) Describe and explain the results shown in the table.
(2)
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(c) (i) Suggest how you could adapt this apparatus to obtain results at a
temperature of 5qC.
(1)
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(ii) Suggest one reason why the student should not collect results above 35 qC.
(1)
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(d) Suggest one way in which the student could modify the investigation to improve
the accuracy of the results.
(1)
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(Total for Question 3 = 8 marks)
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4 Many endurance athletes train at high altitude (height above sea level) before a major
sporting event. They do this because they think that training at high altitude changes
the number of red blood cells in their body.
Describe an investigation to find out if training at high altitude does change the
number of red blood cells in the human body.
(6)
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(Total for Question 4 = 6 marks)
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5 The diagram shows a food web from a grassland ecosystem.
Hawk
Sparrow
Rabbit
Snake
Spider
Toad
Mouse
Grasshopper
Praying mantis
Grass
(a) From the food web, name an organism that is
(i)
a producer
(1)
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(ii) a primary consumer
(1)
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(iii) a tertiary consumer
(1)
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(b) How many different organisms feed on the grasshopper in the food web?
(1)
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(c) From the food web, draw a food chain that contains 5 levels and includes the
spider.
(2)
(d) A land owner wanted to reduce the number of rabbits feeding on his grass, so he
killed a large number of rabbits.
Suggest an explanation for the effect this would have on the hawk population.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 5 = 8 marks)
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6 As part of an investigation into biological cycles, Ome buried a dead mouse in some
soil outside her classroom.
Explain what would happen to the body of the mouse over the next six months.
(5)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 6 = 5 marks)
12
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7 The kidney contains many nephrons and is involved in excretion.
(a) Ultrafiltration occurs at the glomerulus. Describe how the blood leaving the
glomerulus will differ from blood entering the glomerulus.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) In part of the nephron, selective reabsorption occurs.
What is meant by the term selective reabsorption?
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) The following passage describes part of the role of the kidney. Complete the
sentences in the passage by writing a suitable word or words on each dotted line.
(5)
The amount of water returning to the blood is controlled by the hormone
............................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
which is released from the .............................................................................. gland.
The solution containing waste products from the kidney is called
............................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
and passes down a tube called the ............................................................... . . . . . . . . . . . . . . .
It is stored in the . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............................. before being passed from the body down
the urethra.
(Total for Question 7 = 10 marks)
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13
8 A student investigated how much gas was given off under different conditions in the
production of beer. The diagram shows the apparatus she used.
Test tubes A and B each contained the same volume of yeast mixed with glucose solution.
Test tube C contained yeast in water, but no glucose.
Test tube D contained glucose solution, but no yeast.
Test tube A was placed in room temperature at 20qC. The other test tubes were
placed in a warm water bath at 35qC. A balloon was put over the opening of each
tube.
balloon
A
B
C
D
water at 35qC
yeast and
glucose solution
yeast
in water
glucose
(no yeast)
The table describes the appearance of the balloons after 15 minutes.
Some inflate (fill up with gas), others do not.
Tube
Appearance of balloon
after 15 minutes
A
slightly inflated
B
very inflated
C
no change
D
14
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(a) (i)
Explain why the balloons on tubes A and B inflated.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(ii) Explain why being in a higher temperature caused the balloon on tube B to
inflate more than the balloon on tube A.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) Why did the balloon on tube C not show any change?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) Describe the appearance you would expect the balloon on tube D to have at the
end of the experiment.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 8 = 6 marks)
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9 Lipase is an enzyme that breaks down lipids (fats) to fatty acids and glycerol. Lipase is
produced in the pancreas and acts in the small intestine.
(a) On the diagram, label the pancreas and the small intestine.
(2)
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(b) The graph shows the relative amount of lipid broken down by lipase under
different conditions.
Relative amount
of lipid broken
down in a
minute
Lipase in
acidic solution
(i)
Lipase in
alkaline solution
Lipase and
bile
Describe and explain the results shown by the graph.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Name the three chemical elements present in lipids.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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17
(c) Describe how the structure of the small intestine is adapted for the efficient
absorption of the products of digestion.
(5)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 9 = 12 marks)
18
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10 Nicola investigated the digestion of lactose, a substance found in milk.
The diagram shows the apparatus she used.
milk
containing
lactose
beads
clamp
milk containing
glucose
beaker
The beads contained an enzyme called lactase. This enzyme digests lactose into two
sugars called glucose and galactose.
The outer coat of the beads allows milk to enter and sugars to leave. The outer coat
also prevents the enzyme from leaving.
An experiment was carried out in which milk was allowed to flow through the
apparatus at different speeds. The speed of flow was changed using the clamp on the
exit tube.
The milk collected in the beaker was tested for the concentration of glucose it
contained at each flow speed. The graph shows the results.
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19
160
140
Glucose concentration in mmol per litre
120
100
80
60
40
20
0
0
10
20
30
40
Speed of milk flow in cm3 per minute
20
Speed of milk flow through
apparatus in cm3 per minute
Glucose concentration in beaker
milk in mmol per litre
4
156
6
132
10
100
18
55
32
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(a) (i)
Describe the relationship between the speed of flow and the concentration of
glucose.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Suggest an explanation for the relationship between the speed of flow and
the concentration of glucose.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) The investigation was carried out at 20 qC.
(i)
Name two variables, apart from temperature, that need to be kept the same
during this investigation.
(2)
1
. . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ . . . . . . . . . . . . . . . . . .
2
. . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ . . . . . . . . . . . . . . . . .
(ii) Suggest how the results would be different if the investigations had been
carried out at 25 qC.
Explain your answer.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) How would the concentration of glucose in the beaker be different if the beads
used were bigger in size?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(d) Give one way in which the results in this investigation could be made more
reliable.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 10 = 9 marks)
22
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11 Angela carried out an experiment to investigate how breathing rate changes during
exercise.
She worked with a partner who counted the number of breaths she took during
Ɣ
three periods of 20 seconds at rest
Ɣ
three periods of 20 seconds immediately after 5 minutes of exercise
Ɣ
three periods of 20 seconds immediately after 10 minutes of exercise.
The results that Angela collected from her experiment are given in the table.
Situation when
breaths counted
At rest
After 5 minutes
of exercise
After 10 minutes
of exercise
Number of
breaths
in 20 seconds
1st period
Number of
breaths
in 20 seconds
2nd period
Number of
breaths
in 20 seconds
3rd period
Average
breathing rate
in breaths per
minute
5
6
5
16
15
16
14
45
18
20
18
56
(a) Give two variables that Angela should have controlled in her experiment. For
each variable describe how she could control it.
(4)
Variable 1 .................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....................................... ...................................................................................................... . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
Variable 2
................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................ .................................................................................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) (i)
State how Angela’s breathing rate changed with exercise.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
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(ii) Explain why Angela’s breathing rate changed during exercise.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 11 = 9 marks)
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12 The oil seed plant is an important crop plant grown by farmers.
(a) The stages below are used to insert a gene for herbicide resistance into crops such
as oil seed plant.
Place the stages in the correct order by writing the order (1, 2, 3, 4 and 5) in the
table.
(4)
Stage
Order
Recombinant DNA inserted into the crop plant cell
using a vector.
Desired gene for herbicide resistance inserted into recipient
DNA using an enzyme.
Desired gene for herbicide resistance removed from
donor cell using an enzyme.
The plant is herbicide resistant.
Desired gene for herbicide resistance identified.
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(b) Give one example of a vector used in genetic modification.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) State the role of restriction enzymes and ligase enzymes in genetic modification.
(2)
restriction enzymes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................................................................. .......................................................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
ligase enzymes ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...................................................... ...................................................................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) (i)
What is meant by the term herbicide?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Give a reason why a farmer would want his crop plants to be resistant to a
herbicide.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(e) Suggest why some people are concerned about genetically modified (GM) crops.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 12 = 11 marks)
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13 The table shows data taken from dairy farms in the UK. It shows changes in milk yield
and dairy herd size (number of cows) between the years 2000 and 2008.
Year
Average milk yield
in dm3 per cow
per year
Average size of
dairy herd
in thousands
2000
6,048
2,330
2001
6,449
2,229
2002
6,450
2,224
2003
6,631
2,185
2004
6,886
2,060
2005
6,999
2,003
2006
6,963
1,989
2007
6,924
1,961
2008
6,945
1,902
(a) On the grid, plot the data to show how average milk yield changed during the
years 2000 to 2008. Join your points using straight lines.
(5)
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(b) Describe how the average milk yield per cow changes over the time period.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) Suggest why the average size of dairy herds changed between 2000 and 2008.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) Describe how a selective breeding programme could be used to produce an
improvement in milk yield.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
28
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
(e) Improvement in milk yield can be affected by factors other than selective
breeding.
Suggest two factors that a farmer may change that could lead to an improvement
in milk yield. For each factor, give a reason why it would improve milk yield.
(4)
Factor 1
....................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................................... ......................................................................................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
Reason
......................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
Factor 2
....................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................................... ......................................................................................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
Reason
......................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 13 = 15 marks)
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
29
14 Batten’s disease is caused by a recessive allele. Symptoms include loss of vision,
epilepsy and difficulty in walking and talking.
The mutation causes lipofuscins to build-up in the body’s tissues. Lipofuscins consist
of fats and proteins and form distinctive deposits that cause the symptoms.
(a) Name one system in the body affected by Batten’s disease.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Two adults who had never shown any symptoms married and had a child who
developed Batten’s disease.
Deduce the genotypes of the parents and show how the gametes formed by these
parents can give rise to a child who has the genotype and phenotype for Batten’s
disease.
Use B to show the normal allele and b to show the recessive allele responsible for
Batten’s disease.
(4)
30
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
(c) Recessive conditions, like Batten’s disease, are usually very rare in populations.
However, if someone who comes from a family with a history of the disease
marries a cousin then the likelihood of inheriting the condition changes.
Suggest why this is the case.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 14 = 7 marks)
TOTAL FOR PAPER = 120 MARKS
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
31
32
Edexcel Certificate in Biology
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© Edexcel Limited 2011
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
33
An explanation linking three of the following points:
x mycelium / hyphae
x feed on dead material / saprophytic
x secrete extracellular enzymes onto food / eq
x which breaks it down / digest
x so that breakdown products can be absorbed by fungus
(c)
protoctists
(i)
Any three of the following statements about plant cells:
x plant cells have a (cellulose) cell wall
x plants cells contain chloroplasts
x plant cells store carbohydrate as starch (or sucrose)
x plant cells contain a vacuole
animals
(i)
Answer
(b)
1 (a)
Question
number
Paper 1B
Sample Mark Scheme
ACCEPT converse statements about
the animal cell
ACCEPT fish
Notes
Total: 8
3
3
1
1
Marks
34
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
any modification that forces movement in a straight line
cruel / unethical / cause harm / kill beetle / eq
IGNORE denatured
(ii)
(d)
ice
(i)
(c)
(8.3 + 8.4 + 8.1 + 8.0) ÷ 4
= 8.2
(ii)
increase in temperature leads to an increase in distance moved
enzymes work better / more energy / more respiration
5.8
(i)
(b)
3 (a)
Answer
46
(c)
Question
number
not four cells / two daughter cells
not sexual / asexual
A = cytoplasm
B = chromosome / DNA
C = cell membrane
Answer
(b)
2 (a)
Question
number
ACCEPT beetle moves too quickly to
trace its path accurately
IGNORE fridge
ALLOW 1 in working for division by 4
ALLOW ±1 mm
Notes
ACCEPT either a correction or an
identification of a wrong statement
Notes
Total: 8
1
1
1
2
2
1
Marks
Total: 6
1
2
3
Marks
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
35
5
grass --> grasshopper --> spider --> snake --> hawk
OR
grass --> grasshopper --> spider --> sparrow --> hawk
An explanation linking the following points:
x hawk numbers decrease / drop / go down
x (because) less food / rabbits for them to eat
(c)
(d)
grass
rabbit/grasshopper
hawk/snake/sparrow
Answer
C : two or more altitudes
O : same person / people / gender / age
R : repeat at each altitude / several samples
M1 : count (number of red blood cells)
M2 : use microscope
S1 : same diet
S2 : other controlled variable eg training intensity
Answer
(b)
(i)
(ii)
(iii)
Question
number
5 (a)
4
Question
number
ACCEPT could stay the same,
as hawks eat more of other (named)
prey instead
1 mark for 5 organisms including
spider
1 mark for correct arrows
Notes
Notes
Total: 8
2
2
1
1
1
1
Marks
Total: 6
6 max
Marks
36
Edexcel Certificate in Biology
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© Edexcel Limited 2011
6
Question
number
An explanation linking five of the following:
x bacteria / fungi / decomposers / a named example
x digest / break down
x body tissue / proteins / compounds / eq
x (because they contain) enzymes
x (leading to) loss of mass / dead mouse getting smaller / decays
x release of carbon dioxide / water
x release of mineral ions / named mineral ion
x ref to speed depending on environmental temperature / season
Answer
ACCEPT reference to
insects/invertebrates/scavenger
Notes
Total: 5
5
Marks
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
37
Answer
some substances / eq
absorbed/eq into the blood
ADH
pituitary
urine
ureter
bladder
(c)
A description including three of the following:
x less glucose
x less water
x fewer amino acids
x less urea
x fewer ions
(b)
7 (a)
Question
number
ACCEPT converse arguments for
blood entering the glomerulus
Notes
Total: 10
5
2
3
Marks
38
Edexcel Certificate in Biology
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© Edexcel Limited 2011
no change / same as C / does not inflate
(c)
An explanation linking the following points:
x increased enzyme/yeast activity / eq
x increased chemical reactions / kinetic energy / eq
(ii)
no glucose / eq
An explanation linking the following points:
x respiration (of the yeast)
x (produces) carbon dioxide (gas)
(i)
Answer
(b)
8 (a)
Question
number
IGNORE no respiration
ACCEPT no gas/carbon dioxide
produced
ACCEPT warmer gas takes up larger
volume
Notes
Total: 6
1
1
2
2
Marks
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
39
(c)
(b)
9 (a)
carbon, hydrogen and oxygen
(ii)
A description including five of the following:
x villi
x microvilli
x (have a) large surface area
x (and have) thin walls / epithelium
x (rich) capillary network
x (to allow maximum rate of) diffusion
x to carry away molecules / maintain gradient
x (into) lacteals
x named product of digestion
An explanation linking four of the following points:
x lipase works best with bile
x (and works) least well in acidic / better in alkaline
x bile is alkaline / neutralises (stomach acid) / optimum pH /eq
x bile emulsifies lipid
x (therefore) larger surface area (for lipase)
both correctly labelled
Answer
(i)
Question
number
Allow C, H, O
Notes
Total :12
5 max
1
4 max
2
Marks
40
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
10
more experiments / eq
(d)
An explanation linking two of the following:
x more glucose / more digestion
x (because) faster enzyme activity / optimum temperature
x (and) higher kinetic energy / more collisions / eq
(ii)
lower / less glucose
Any two from:
x concentration of enzyme/lactase
x type of milk
x size of beads
x number of beads
An explanation linking the following:
x if speed of flow high, then less time in bead
x (so less time) to digest / in contact with enzyme/lactase
(ii)
(i)
faster flow, lower glucose concentration / less glucose
Answer
(i)
(c)
(b)
(a)
Question
number
ACCEPT
less glucose
milk flows faster (at a higher temp)
less time in contact with enzyme
ACCEPT converse argument
Notes
Total: 9
1
1
2 max
2 max
2
1
Marks
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
41
11
(b)
(a)
increases
An explanation linking four of the following:
x muscles
x (need) more oxygen
x (because of) increased respiration
x (to provide) more energy
x (increase breathing also) removes more CO2
x (as) waste product of respiration
(ii)
temperature of room
(controlled by) using thermostat / air conditioning
amount of exercise / type of exercise
(controlled by having) same number of exercise type
Answer
(i)
Question
number
ACCEPT ref to heat
ACCEPT other reasonable controls
Notes
Total: 9
max 4
1
4
Marks
42
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
12
(e)
(d)
restriction enzyme: to cut DNA / chop DNA
(c)
to spray / kill weeds without killing crop
(ii)
Any two from:
x crops could alter food chains/webs
x lack of control on gene transfer
x GM crops could take over ecosystems
x might be effects on health
(substance that) kills plants
(i)
ligase enzymes: to join / stick DNA
virus / plasmid / gene gun
Stage
Recombinant DNA inserted into the crop plant
cell using a vector
Desired gene for herbicide resistance inserted
into recipient DNA using an enzyme
Desired gene for herbicide resistance removed
from donor cell using an enzyme
The plant is herbicide resistant
Desired gene for herbicide resistance identified
Answer
(b)
(a)
Question
number
5
1
2
3
Order
4
ACCEPT
gene gets into wild plants/weeds
(so) weeds now resistant to herbicide
/ herbicide now non-functional
1 mark for 1st statement correct
1 mark for last statement correct
1 marks for statement 2 before
statement 3
1 mark for statement 3 before
statement 4
Accept
Total: 11
max 2
1
1
2
1
4
Marks
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
43
13
A description that includes the following:
x increases
x up to 2005 / then levels off / plateaus
each cow producing more milk, so fewer cows needed / total yield for
the herd stays constant / less demand from consumers for milk
A description that includes three of:
x select bulls
x that produce female calves with high milk yield / eq
x choose high milk-yielding cows
x and then repeat with offspring
Any two from:
nutrition / eq
greater fat/lipid in diet to increase milk yield / eq
(b)
(c)
(d)
(e)
sex hormones
larger udders to increase milk production
keep indoors
(so) more energy available for milk production
size suitable ;
line joining points ;
axes correct way round and labelled ;
points correctly plotted ;;
Answer
(a)
Question
number
ALLOW any other suitable answers
ACCEPT due to diversification
ACCEPT by 897 dm3 per cow
Note: 2 marks for points, penalise 1
mark for each incorrect plot
Accept
Total: 15
4
max 3
1
2
5
Marks
44
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
14
(c)
parents: Bb
(b)
(BB
Bb
b
bb
b
(therefore) increased chance of these combining / reference to
inbreeding
cousin may (also) carry recessive allele / they share a common
ancestor
normal normal) affected
Bb)
B
Answer
Bb
phenotype of children: (normal
genotype of children:
gametes of parents: B
nervous system
(a)
Question
number
ALLOW only bb shown as Batten’s
phenotype
ALLOW Bb appearing once
ACCEPT skeletal system
Notes
Total: 7
2
4
1
Marks
Write your name here
Surname
Other names
Edexcel
Certificate
Centre Number
Candidate Number
Biology
Paper: 2B
Sample Assessment Material
Time: 1 hour
Paper Reference
KBI0/2B
You do not need any other materials.
Total Marks
Instructions
black ink or ball-point pen.
t Use
in the boxes at the top of this page with your name,
t Fill
centre number and candidate number.
all questions.
t Answer
the questions in the spaces provided
t Answer
– there may be more space than you need.
t Show all the steps in any calculations and state the units.
Information
total mark for this paper is 60.
t The
marks for each question are shown in brackets
t The
– use this as a guide as to how much time to spend on each question.
Advice
Read each question carefully before you start to answer it.
t Keep
on the time.
t Write anyoureyeanswers
and in good English.
t Try to answer everyneatly
t Check your answersquestion.
if you have time at the end.
t
Turn over
S41082A
©2011 Edexcel Limited.
Edexcel Certificate in Biology
*S41082A0116*
SAMs
© Edexcel Limited 2011
45
Answer ALL questions.
1 Read the passage below. Use the information in the passage and your own
knowledge to answer the questions that follow.
The harlequin ladybird threaten native species
Scientists have warned that the harlequin ladybird is likely to threaten more than
1000 of Britain’s native species. It has spread from the south of Britain to the north
in only four years and is now one of the fastest spreading non-native species in
Europe, as well as the most invasive ladybird on Earth. The negative impact on
biodiversity in Britain could be far-reaching and disruptive. In the United States,
where the harlequin ladybird arrived over 20 years ago, it has been associated
with severe declines in native species.
5
The harlequin ladybird, native to Asia, was introduced to the United States and
continental Europe as a biological control agent because it eats more pest insects
than any other ladybirds. Unfortunately, harlequin ladybirds will also eat non-pest
and beneficial insects, including the larvae of other ladybirds and the eggs and
larvae of butterflies and moths. Britain’s 46 species of native ladybird and these
other insects play a key role in our ecosystems, but the harlequin ladybird has the
potential to put many of them at risk.
10
15
The first recorded sighting of the harlequin ladybird in Britain was in 2004. The
scientists’ first step has been to understand its subsequent rapid spread. The
public has played a key role in monitoring the invasion through the Harlequin
Ladybird Survey website, which was launched in 2005 and has since received
more than 30 000 online records.
20
Invasive species are one of the greatest threats to global biodiversity. Using data
from the Harlequin Ladybird Survey, scientists have a unique opportunity to study
the early establishment, spread and adaptation of an invasive species.
The research team are now exploring how the few native enemies of the
harlequin ladybird that do exist could be used to control the invasion. One idea
is to use a sexually transmitted mite, which makes some ladybirds infertile. If
the transmission of these mites could be encouraged, the harlequin ladybird
population could be reduced.
25
46
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
(a) What is meant by the term biological control (line 9)?
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Using the passage and your own knowledge, give two different ways in which the
harlequin ladybird could affect native species.
(2)
1
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
2
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) Suggest what is meant by the term global biodiversity (line 20).
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) State why the harlequin ladybird was deliberately introduced into the United
States (line 8).
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(e) Suggest two possible ways that the harlequin ladybird may have reached Britain.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(f ) Explain why the harlequin ladybird may not be welcomed by farmers.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(g) Explain the benefits of involving the public in monitoring the spread of the
harlequin ladybird.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 1 = 13 marks)
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2 The diagram shows a section through the human eye with different parts labelled A
to E.
C
B
A
D
E
(a) The table describes the function of some parts of the eye.
Complete the table by writing the correct label letter in the box provided. The first
one has been done for you.
(2)
Description of function
Label letter
protects the surface of the eye
C
changes diameter in response to light intensity
sends nerve impulses to the brain
(b) Describe how the different structures in the eye bring about changes that allow a
person to see an object held near to the eye clearly.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) The cornea is transparent and does not contain any blood vessels.
How do the cells in the cornea obtain the oxygen they need?
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) The passage describes a reflex action involving the eye.
Use suitable words to complete the sentences in the passage.
(4)
John blinked when he saw an object approaching his eye. This reflex action
protected his eye from being damaged.
Receptor cells in the light sensitive part of his eye called the .......................................................
detected the object. Nerve impulses were then sent to the central nervous
system. The message then passed across a tiny gap called a ....................................................... to
another neurone called the . . . . . . . . . . . . . . . . . . . . . . ................................. neurone.
Eventually the impulse passed along a motor neurone to effector cells called
............................. . . . . . . . . . . . . . . . . . . . . . . . . . .
. These cells contracted to make him blink.
(Total for Question 2 = 11 marks)
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3 Lactobacillus bulgaricus and Streptococcus thermophilus are two organisms that can be
used to make yoghurt.
Milk is pasteurised by heating to 95 qC for 20 minutes. The milk is cooled to 43 qC and
then the organisms are added. The mixture is incubated at a temperature of 43qC
for 4 to 6 hours. During incubation, lactose is converted into lactic acid and other
substances that add flavour. Once the yoghurt is made it is cooled and kept at 5 qC.
The table shows the concentration of lactic acid produced when these organisms are
used on their own or used together.
Incubation time
in hours
(a) (i)
Lactic acid concentration
in arbitrary units
Lactobacillus
alone
Streptococcus
alone
Lactobacillus
and
Streptococcus
0
24
24
24
2
26
30
50
4
28
50
84
6
36
62
100
8
50
70
140
Name the group of organisms that Lactobacillus belong to.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Give two structural features that are characteristic of this group.
(2)
1
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................. . . . . . . . . . . . . . . . . .
2 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
(b) Using data in the table, suggest how best to use these organisms to make yoghurt.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) Calculate the percentage increase in lactic acid concentration in yoghurt over
eight hours when Streptococcus is used alone. Show your working.
(2)
Answer ........................................................................................... %
(d) Suggest one variable that needs to be controlled so that a valid comparison can
be made between the concentrations of lactic acid produced when the organisms
are used alone or when used together.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(e) Different temperatures are used in different parts of the yoghurt-making process.
The table explains why two of these temperatures are used.
Complete the table by writing the correct temperature next to the correct
explanation.
(2)
Explanation
Temperature in °C
optimum temperature for enzymes
reduces growth of living organisms
(Total for Question 3 = 10 marks)
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4 Scientists in the United States carried out a study to compare the effects of two
different diets on body mass in two groups of healthy women. One group followed a
low fat diet and the other group followed a low carbohydrate diet.
Mean body
mass in kg
low fat diet
low carbohydrate diet
92
88
84
80
0
1
2
3
4
5
6
7
8
9
10
11
12
Time in weeks
(a) (i)
For the low carbohydrate group, calculate the rate of mass loss in kg per week
for the weeks 0 to 12.
(2)
Answer ............................................................... kg per week
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(ii) Describe the results shown in the graph.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iii) Suggest an explanation for the results shown in the graph.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) For the results of the investigation to be valid it is important that certain variables
should be the same for both groups of healthy women.
For example, the women should all be of the same body size.
(i)
Explain how different body sizes could affect loss in mass.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(ii) Suggest two other variables that should be the same for both groups of
healthy women.
(2)
1 . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............. .............................................................................................................................. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
2 . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............. .............................................................................................................................. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 4 = 12 marks)
Edexcel Certificate in Biology
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55
5 Jagdeep carried out an investigation into the conditions necessary for germination in
pea seeds.
She set up 8 tubes with 10 seeds in each tube.
A
B
C
D
E
F
G
H
The conditions for each tube are shown below.
x
x
x
x
Tubes A and B contained dry cotton wool and were kept at 16 qC.
Tubes C and D contained wet cotton wool and were kept at 16 qC.
Tubes E and F contained wet cotton wool and were kept at 4 qC.
Tubes G and H contained dry cotton wool and were kept at 4 qC.
She left all the tubes for 14 days and recorded the number of seeds that had
germinated in each tube.
(a) What would Jagdeep observe to confirm that the seeds had germinated?
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
56
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(b) Jagdeep counted the number of seeds that germinated after 14 days in each tube
and put her results in a table. However, she put two of her numbers in the wrong
places. Her table is shown below.
Tube
Number of seeds germinated
A
1
B
8
C
9
D
2
E
2
F
1
G
0
H
0
Which two tubes have the wrong numbers written beside them? Give a biological
explanation for your answer.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) After the seeds have germinated the seedlings must be exposed to light or they
will not grow well and their leaves will be yellow.
Explain why.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 5 = 7 marks)
58
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6 To test the quality of water, a sample is collected and kept in a sealed container in the
dark. After five days, the biological oxygen demand or BOD is found by measuring
how much oxygen in the water has been used up by microorganisms breaking down
organic matter.
BOD is measured in mg per dm3.
(a) Suggest why the sealed samples are kept in the dark.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Farm waste contains organic matter and, by law, farms are not allowed to release
waste that produces a BOD greater than 25 mg of oxygen per dm3.
The table below gives readings for the BOD in the waste produced by four farms.
(i)
BOD in mg
per dm3
Farm
Volume of waste produced
per week in dm3
A
180
28
B
30
20
C
20
115
D
134
76
Which of these farms are breaking the law?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(ii) Which farm causes the greatest BOD problem?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
Edexcel Certificate in Biology
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(c) Explain the possible effects on a river of releasing waste with a high BOD.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 6 = 7 marks)
TOTAL FOR PAPER = 60 MARKS
60
Edexcel Certificate in Biology
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Edexcel Certificate in Biology
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© Edexcel Limited 2011
61
(g)
An explanation linking the following points:
x increase size of sample / extend data / eq
x (therefore) better reliability / eq
An explanation linking the following points:
x kills beneficial species
x which could pollinate flowers
(f)
because it eats more pests than native species / eq
(d)
Any two from:
x flew
x brought by winds
x carried on crop plants
x brought in (with cargo) by transport
number of species
in the world
(c)
(e)
competition for food / eq
eat / prey on them
using one organism / predator
to kill another pest organism
Answer
(b)
1 (a)
Question
number
Paper 2B
Sample Mark Scheme
ACCEPT
increase geographic area of study
(therefore) more complete picture /
better coverage
ACCEPT named species e.g. other
ladybirds / butterflies
ACCEPT resources
Notes
Total: 13
2
2
max 2
1
2
2
2
Marks
62
Edexcel Certificate in Biology
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© Edexcel Limited 2011
diffusion
(from) air / aqueous humour
retina
synapse
relay
muscles
(c)
(d)
A
sends nerve impulses to the brain
A description including three of the following:
x lens
x more curved / eq
x ciliary muscles contract
x (so) sharp/focused image is presented on retina
Label letter
(C)
D
Description of function of part
protects the surface of the eye
changes diameter in response to
light intensity
Answer
(b)
2 (a)
Question
number
ACCEPT becomes more convex
Notes
Total: 11
4
2
max 3
2
Marks
Edexcel Certificate in Biology
SAMs
© Edexcel Limited 2011
63
(e)
(d)
(c)
(b)
3 (a)
Any two from
x plasmids
x circular chromosome / DNA
x flagellum
x capsule
x slime layer
(ii)
Explanation
optimum temperature for enzymes
reduces growth of living organisms
Temperature in °C
43
5
number of bacteria in starter culture / same milk / same initial pH
= 192(%)
(70 – 24) ÷ 24 x 100%
incubate for 8 hours / incubate for longer time
use both bacteria together
bacteria
Answer
(i)
Question
number
ALLOW any other valid variable
ACCEPT 191.7, 191.666 etc
ALLOW 1 mark for 70 - 24 or 46
ACCEPT no nucleus
Notes
Total: 10
2
1
2
2
max 2
1
Marks
64
Edexcel Certificate in Biology
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(b)
4 (a)
An explanation linking three of the following:
x small people have large surface area to volume ratio
x (therefore) more heat loss
x respiration (to replace heat lost)
x maintain body temperature
x uses more carbohydrate / fat
Any two from:
x exercise
x state of health
x pregnant or not
x age
(ii)
An explanation linking two of the following:
x less carbohydrate / less energy available from food
x (but) body still requires energy for metabolic processes
x (therefore) fat stores respired / broken down to release energy
(iii)
(i)
A description including any three from:
x loss in mass with both diets
x low carbohydrate falls more than low fat
x greatest rate of fall for both between week 1 and 2 / linear
fall after 7 weeks in low fat diet
x starting mean mass is different / eq
x correct manipulation of data
ALLOW any other acceptable variable
ALLOW converse arguments
ACCEPT conseq on week 12 figure
= 0.71
ACCEPT 0.708 or more figures
ACCEPT 84 or 83 as week 12 figure
Notes
(92 – 83.5) ÷ 12
Answer
(ii)
(i)
Question
number
Total: 12
max 2
max 3
max 2
max 3
2
Marks
Edexcel Certificate in Biology
SAMs
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65
B and D
AND
B should be lower / same as A
B (warm but)too dry / eq
OR
D should be higher / same as C
D wet and warm
An explanation linking two of the following:
x (light needed for) photosynthesis
x (to stop) food reserves running out
x to produce chlorophyll
(c)
Any two from:
x growth of root / radical
x growth of shoot / plumule /cotyledons
x testa splitting / eq
Answer
(b)
5 (a)
Question
number
Notes
Total: 7
max 2
3
max 2
Marks
66
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6
(c)
(b)
(a)
D
(ii)
Answer
An explanation linking three of the following:
x bacteria / decomposers increase
x (therefore) less oxygen
x (and less) respiration
x (leading to) death (of plants / animals in river)
x eutrophication
A, C and D / all except B
(which produces oxygen)
prevent photosynthesis
(i)
Question
number
Notes
Total: 7
max 3
1
1
2
Marks
Level 1/Level2 Certificate
Chemistry (KCH0)
Sample Assessment Material
First examination June 2012
Contents
Paper 1C
Sample Assessment Material
Sample Mark Scheme
3
31
Paper 2C
Sample Assessment Material
Sample Mark Scheme
Edexcel Certificate in Chemistry
43
59
SAMs
© Edexcel Limited 2011
1
General Marking Guidance
2
x
All candidates must receive the same treatment. Examiners must
mark the first candidate in exactly the same way as they mark the
last.
x
Mark schemes should be applied positively. Candidates must be
rewarded for what they have shown they can do rather than
penalised for omissions.
x
Examiners should mark according to the mark scheme not according
to their perception of where the grade boundaries may lie.
x
There is no ceiling on achievement. All marks on the mark scheme
should be used appropriately.
x
All the marks on the mark scheme are designed to be awarded.
Examiners should always award full marks if deserved, ie if the
answer matches the mark scheme. Examiners should also be
prepared to award zero marks if the candidate’s response is not
worthy of credit according to the mark scheme.
x
Where some judgement is required, mark schemes will provide the
principles by which marks will be awarded and exemplification may
be limited.
x
When examiners are in doubt regarding the application of the mark
scheme to a candidate’s response, the team leader must be
consulted.
x
Crossed out work should be marked UNLESS the candidate has
replaced it with an alternative response.
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
Write your name here
Surname
Other names
Edexcel
Certificate
Centre Number
Candidate Number
Chemistry
Paper: 1C
Sample Assessment Material
Time: 2 hours
Paper Reference
KCH0/1C
You must have:
Ruler
Candidates may use a calculator.
Total Marks
Instructions
black ink or ball-point pen.
t Use
in the boxes at the top of this page with your name,
t Fill
centre number and candidate number.
all questions.
t Answer
the questions in the spaces provided
t Answer
– there may be more space than you need.
t Show all the steps in any calculations and state the units.
Information
total mark for this paper is 120.
t The
marks for each question are shown in brackets
t The
– use this as a guide as to how much time to spend on each question.
Advice
Read each question carefully before you start to answer it.
t Keep
on the time.
t Write anyoureyeanswers
and in good English.
t Try to answer everyneatly
t Check your answersquestion.
if you have time at the end.
t
Turn over
S41079A
©2011 Edexcel Limited.
Edexcel Certificate in Chemistry
*S41079A0128*
SAMs
© Edexcel Limited 2011
3
4
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
Answer ALL questions.
1 The table shows the properties of four substances.
Use the information in the table to answer the following questions.
Melting point
in °C
Boiling point
in °C
A
1650
B
Substance
Conducts electricity when
solid
liquid
2230
no
no
1538
2862
yes
yes
C
–7
59
no
no
D
801
1413
no
yes
Place a cross ( ) in the appropriate box to indicate your answer.
Choose from A to D a substance that could be:
(5)
(a) a metal
A
B
C
D
C
D
C
D
C
D
C
D
(b) a giant covalent structure
A
B
(c) an ionic compound
A
B
(d) a liquid at 25 °C
A
B
(e) a solid at 1600 °C
A
B
(Total for Question 1 = 5 marks)
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
5
2 A student investigated what happened when a sample of wax was heated using a
Bunsen burner.
He set up the apparatus as shown in the diagram.
solid wax
HEAT
The student heated the solid wax strongly with a Bunsen burner until it turned into a
liquid.
(a) Give the name of the process that occurs when a solid turns into a liquid.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Explain one change needed to make the experiment safer.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) Describe the changes in arrangement, movement and energy of the particles
when the liquid wax cools to become a solid.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 2 = 6 marks)
6
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3 The diagram represents an atom of an element.
A
B
C
(a) The diagram shows that there are equal numbers of particles A and C.
(i)
State the name of each of the particles A and B.
(2)
A . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................. ........................................................................................................................... . . . . . . . . . . . . . . . . . .
B
. . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ........................................................................................................................... . . . . . . . . . . . . . . . . . .
(ii) State the atomic number and mass number of this atom.
(2)
Atomic number
Mass number
(b) (i)
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....................................................... .................................................................................... . . . . . . . . . . . . . . . . . .
......... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .................................................. .......................................................................................... . . . . . . . . . . . . . . . . . .
State the name of this element.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) State the electronic configuration of this element.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 3 = 6 marks)
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7
4 A student wanted to find out how easily different metal carbonates decomposed on
heating.
She placed a sample of a metal carbonate into a test tube and heated it, passing the
gas given off through limewater using the apparatus shown in the diagram.
metal
carbonate
limewater
HEAT
She heated three other metal carbonates in turn and measured the time taken for the
limewater to turn milky.
Her results are given in the table.
Time taken
in seconds
Metal carbonate
8
copper(II) carbonate
5
magnesium carbonate
25
lead(II) carbonate
15
sodium carbonate
does not turn milky
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(a) State the name of the gas that causes the limewater to turn milky.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Use the results to identify, with a reason, which metal carbonate decomposed
most easily.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) What do the results suggest about the effect of heat on sodium carbonate?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) State two things that the student must do to make sure the experiment is valid
(a fair test).
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
2 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(Total for Question 4 = 6 marks)
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5 Fractional distillation is an important process in the oil industry.
In this process, the crude oil is separated into a number of fractions. Each fraction is a
mixture of hydrocarbons.
The diagram shows the column used for fractional distillation.
heated
crude oil
(a) What is meant by the term hydrocarbon?
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Bitumen, diesel, gasoline and refinery gases are three of the fractions obtained
from crude oil.
(i)
Which one of these three fractions has the lowest boiling point?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Which one of these three fractions is the most viscous?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
10
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(c) Explain how the separation of crude oil into fractions takes place in the
fractionating column.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 5 = 8 marks)
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6 (a) Isomers are compounds that have the same molecular formula but different
displayed formulae.
The molecular formula C4H8 represents several isomers.
The displayed formulae and names for two of these isomers are
H
H
H
H
H H
C=C C
H
C=C
C H
H
H H
H
H
H
but-1-ene
(i)
C
C
H
H
methylpropene
Draw the displayed formula and give the name for another alkene with the
molecular formula C4H8
(2)
Name .........................................................................
(ii) The displayed formula of another isomer of C4H8 is
H
H
H
C
C
H
H
C
C
H
H
H
cyclobutane
The general formula of cyclobutane is also CnH2n
State why cyclobutane is not an alkene.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
12
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(iii) Cyclobutane can be distinguished from but-1-ene by adding bromine water
and shaking. Bromine water is orange.
State what you would see when bromine water is shaken separately with each
compound.
(2)
Observation with cyclobutane
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
Observation with but-1-ene
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Cracking is used to break long alkane molecules into shorter alkanes and alkenes.
Explain why this process is of such importance in the petrochemical industry.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) Cracking can be carried out in the laboratory by passing the vapour of an alkane
over a heated catalyst using the apparatus shown.
decane soaked into
mineral wool
catalyst
ethene
HEAT
liquid alkane
water
When decane (C10H22) is cracked, a shorter chain alkane and ethene (C2H4) can be
produced.
(i)
Write a chemical equation for the cracking of decane.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) The alkane produced can be used as a fuel for cars.
When this fuel is burned in a car engine, some incomplete combustion occurs.
This produces carbon monoxide, which is dangerous to humans.
Explain why carbon monoxide is dangerous to humans.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 6 = 11 marks)
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7 Copper chloride is a soluble ionic compound. Solid copper chloride is green.
(a) A crystal of copper chloride was placed in a beaker containing water. It was left
for several days.
copper chloride
crystal
water
Explain how the appearance of the liquid in the beaker changes after several days.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) A chemist electrolyses a sample of molten copper chloride, CuCl2.
+–
lamp
cathode
anode
molten copper chloride
Name the products formed at the electrodes.
(2)
Anode ............................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................. . . . . . . . . . . . . . . . . .
Cathode ...................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .................................... ........................................................................................................ . . . . . . . . . . . . . . . . . .
(c) Write an equation to show the formation of the product at the negative electrode.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 7 = 6 marks)
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8 Equal masses of iron, magnesium and zinc were placed in separate beakers, each
containing 50 cm3 of copper(II) sulfate solution.
The mass of copper displaced in each case was found and each experiment was
performed three times. The results obtained are given in the table.
Mass of copper produced in grams
Metal
Experiment 1
Experiment 2
Experiment 3
iron
1.1
1.3
1.2
magnesium
2.3
3.2
2.2
zinc
0.9
0.8
1.10
(a) How can you tell that one of the results has been recorded to a greater precision
than the others?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Write a chemical equation for the reaction taking place between magnesium and
copper(II) sulfate.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) (i)
State, in terms of electrons, what happens when a copper ion becomes a
copper atom.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) What name is given to the type of change occurring in (c)(i)?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iii) State two observations you would expect to make when magnesium is added
to copper(II) sulfate solution.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 8 = 7 marks)
16
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9 (a) An aqueous solution of hydrogen peroxide (H2O2) decomposes very slowly into
water (H2O) and oxygen (O2) according to the following equation:
2H2O2(aq) → 2H2O(l) + O2(g)
The reaction is faster when manganese(IV) oxide (MnO2) is added. The
manganese(IV) oxide remains chemically unchanged at the end of the reaction.
A student investigated the reaction in the presence of manganese(IV) oxide. He
collected the oxygen gas produced and recorded its volume every five minutes.
His results are shown in the table.
(i)
Time
in minutes
0
5
10
15
20
25
30
35
40
Volume
in cm3
0
20
32
42
50
55
58
60
60
The volume of gas given off between 5 and 10 minutes is 12 cm3.
Calculate the volume of gas given off between 30 and 35 minutes.
(1)
Answer ......................................................................... cm3
(ii) Explain, in terms of the changes in the rate of the reaction and collisions
between particles, why your calculated volume is less than 12 cm3.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
(iii) After how many minutes did the reaction finish?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(b) What type of substance is manganese(IV) oxide in this experiment?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
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17
(c) Some of the graphs A to F below could represent changes occuring during the
decomposition of hydrogen peroxide.
A
B
Mass
Mass
0
0
Time
C
D
Mass
Mass
0
0
Time
E
Time
F
Mass
Mass
0
18
Time
0
Time
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Answer the questions below by placing a cross ( ) in the appropriate box to
indicate your answer.
Which graph could represent
(i)
the total mass of oxygen given off as the experiment in (a) proceeds?
(1)
A
B
C
D
E
F
(ii) the mass of hydrogen peroxide remaining as the experiment in (a) proceeds?
(1)
A
B
C
D
E
F
(iii) the mass of the manganese(IV) oxide as the experiment in (a) proceeds?
(1)
A
B
C
D
E
F
(Total for Question 9 = 9 marks)
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19
10 When potassium iodide solution is mixed with lead(II) nitrate solution, a reaction
occurs to form the insoluble salt, lead(II) iodide.
The equation for this reaction is:
2KI(aq) + Pb(NO3)2(aq) o PbI2(s) + 2KNO3(aq)
A student carried out an investigation to find how much precipitate was formed with
different volumes of lead(II) nitrate solution.
x He used a measuring cylinder to transfer 15 cm3 of potassium iodide solution into
a clean boiling tube.
x Using a different measuring cylinder, he measured out 2 cm3 of lead(II) nitrate
solution and added this to the potassium iodide solution in the boiling tube.
x A yellow precipitate formed in the tube and was allowed to settle.
x The student then measured the height (in cm) of the precipitate using a ruler.
He repeated the experiment using different volumes of lead(II) nitrate solution.
In each experiment, the potassium iodide solution and lead(II) nitrate solution he
used were of the same concentration.
The graph shows the results he obtained.
Height of precipitate in cm
4
3
2
1
0
0
2
4
6
8
10
12
14
16
Volume of lead(II) nitrate solution added in cm3
(a) Explain why the line on the graph rises to a maximum level, but then does not
change.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
20
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(b) (i)
On the graph, circle the point which seems to be anomalous.
(1)
(ii) Explain two things that the student may have done in the experiment to give
this anomalous result.
(4)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
2 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(c) The diagram shows a result of an identical experiment.
8
solution of
soluble salts
7
6
5
4
3
precipitate of
solid lead(II) iodide
2
1
(i)
How much precipitate has been made in the tube?
(1)
cm
................................................................
(ii) Use the graph to find the voume of lead(II) nitrate solution needed to make
this amount of precipitate.
(1)
................................................................
cm3
(Total for Question 10 = 9 marks)
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21
11 Fluorine and chlorine are two elements in Group 7 of the Periodic Table.
Fluorine reacts with most elements in the Periodic Table, but it does not react with
neon.
Neon is in Group 0 of the Periodic Table.
(a) Explain, in terms of the arrangement of electrons in its atoms, why neon is very
unreactive.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) The diagram on the left shows the arrangement of the electrons in a fluorine
atom.
Use the Periodic Table to help you to complete the diagram on the right to show
the arrangement of electrons in a chlorine atom.
(2)
F
22
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(c) When chlorine gas is bubbled into an aqueous solution of potassium iodide, the
colourless solution turns brown.
(i)
Complete the following ionic equation for the reaction that takes place.
(2)
Cl2(g) + . . . . . . . . . . . . . I−(aq) →
. . . . . . . . . ....................
(aq) +
.............................
(aq)
(ii) What is the name given to this type of reaction?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iii) Why does the solution turn brown?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) When chlorine reacts with concentrated sodium hydroxide solution, a compound
is formed that contains 21.6% by mass of sodium and 33.3% by mass of chlorine.
The rest is oxygen.
Calculate the empirical formula of this compound.
(4)
. . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 11 = 12 marks)
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23
12 Hydrogen can be prepared in the laboratory by reacting zinc with dilute sulfuric acid
using the apparatus shown.
dilute
sulfuric acid
hydrogen
water
zinc
The equation for the reaction is:
Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)
The reaction is fairly slow but, when copper(II) sulfate solution is added, bubbles of
hydrogen form much more quickly.
A student decided to investigate how copper(II) sulfate solution increased the rate of
this reaction.
She set up the apparatus as shown, without copper(II) sulfate present, and counted
the number of bubbles of hydrogen produced every 15 seconds.
She then repeated the experiment with copper(II) sulfate present.
(a) Explain why her method of counting the number of bubbles of hydrogen might
not give accurate results in her second experiment, with copper(II) sulfate present.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
24
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(b) Describe how she should change the experiment to allow the collection of more
precise results.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
The student then decided that she wanted to show that the gas collected was
hydrogen. She burned a sample in oxygen and collected the colourless liquid that
formed on cooling. If the gas were hydrogen then the colourless liquid should be
pure water.
(c) Describe a physical test that she could perform to show that the colourless liquid
is pure water.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
The student’s teacher said that even if the colourless liquid were pure water then it
does not necessarily mean that the gas was hydrogen.
(d) Suggest the name of another gas that produces water when it is burned in
oxygen.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 12 = 7 marks)
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25
13 Ammonia (NH3) is manufactured in the exothermic reaction between nitrogen gas (N2)
and hydrogen gas (H2) in the presence of an iron catalyst.
N2(g) + 3H2(g) `
_ 2NH3(g)
ΔH = –92 kJ/mol
The nitrogen and hydrogen mixture is passed into a reaction chamber at a pressure of
200 atmospheres and a temperature of 450qC.
The reaction is reversible and, if left for long enough, can reach a position of dynamic
equilibrium.
(a) Why is a catalyst needed in this reaction?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) What is meant by the term dynamic equilibrium?
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) A scientist working in the factory making ammonia suggested changing the
reaction conditions to a pressure of 1000 atmospheres and a temperature of
250qC.
Use your knowledge of equilibrium reactions and reaction rates to explain
whether the scientist’s suggestion was a good one.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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26
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
(d) The mixture of gases leaving the reaction chamber contains unreacted nitrogen
and hydrogen as well as ammonia.
(i) Explain how the ammonia can be separated from the unreacted nitrogen and
hydrogen after the mixture has left the reaction chamber.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(ii) What happens to the unreacted nitrogen and hydrogen after it has been
separated from the ammonia?
(1)
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(e) Ammonia is used to make the fertiliser ammonium nitrate (NH4NO3) by reacting
ammonia with nitric acid.
Write a chemical equation for the reaction between ammonia and nitric acid.
(1)
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(f ) Describe a chemical test that you could perform to show that ammonium nitrate
contains ammonium ions.
(3)
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(Total for Question 13 = 14 marks)
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
27
14 Zinc phosphide (Zn3P2) is found in some rat poisons. It is an ionic compound
manufactured by heating zinc and phosphorus together.
(a) (i)
The formula of the zinc ion is Zn2+.
Deduce the formula of the phosphide ion.
(1)
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(ii) Explain why zinc phosphide does not conduct electricity when solid, but
does when molten.
(2)
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(b) Calculate the relative formula mass (Mr) of zinc phosphide.
(2)
Relative formula mass = .........................................................................
28
Edexcel Certificate in Chemistry
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(c) A bag containing 51.4 kg (51400 g) of zinc phosphide stored in a factory
warehouse was accidentally contaminated with water.
Zinc phosphide reacts with water to form zinc hydroxide and phosphine gas, PH3.
The equation for the reaction is:
Zn3P2(s) + 6H2O(l) → 3Zn(OH)2(s) + 2PH3(g)
(i)
Calculate the minimum mass of water, in kg, needed to react with all of the
zinc phosphide in the bag.
(3)
Mass of water needed = ......................................................................... kg
(ii) The factory was evacuated because phosphine can burst into flames
immediately when it comes into contact with oxygen in the air.
What does this suggest about the activation energy for the reaction between
phosphine and oxygen?
(1)
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(iii) Is the reaction between phosphine and oxygen endothermic or exothermic?
Use information from part (ii) to justify your answer.
(1)
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Edexcel Certificate in Chemistry
SAMs
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29
(d) (i)
Phosphine is similar to ammonia (NH3) in the way its atoms are bonded.
Draw a dot and cross diagram to show the arrangement of electrons in a
molecule of phosphine. You should show only the outer electrons of each
atom.
(2)
(ii) Explain why phosphine has a low boiling point.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 14 = 14 marks)
TOTAL FOR PAPER = 120 MARKS
30
Edexcel Certificate in Chemistry
SAMs
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Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
31
D
C
A
(c)
(d)
(e)
An explanation linking the following :
x heat with electric heater / in water bath / sand bath
x because wax may catch fire / prevent liquid wax boiling over
or spitting
A description including the following:
x (becomes) regular arrangement / pattern (of particles)
x particles slow down / vibrate (in fixed positions)
x particles lose (kinetic) energy
(c)
Answer
Answer
(b)
2 (a)
melting
A
(b)
Question
number
B
1 (a)
Question
number
Paper 1C
Sample Mark Scheme
ACCEPT stop moving around (freely)
ACCEPT closer together
ACCEPT
x use test tube holder / clamp
x to prevent being burned by hot
test tube
Notes
Notes
Total: 6
3
2
1
Marks
Total: 5
1
1
1
1
1
Marks
32
Edexcel Certificate in Chemistry
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(b)
3 (a)
boron
2, 3
(ii)
mass number = 11
atomic number = 5
B = neutron(s)
A = proton(s)
(i)
(ii)
(i)
Question
number
Answer
ACCEPT any other punctuation marks,
such as ‘.’ ‘/’ ‘-‘ or no punctuation
No mark for two numbers transposed
Award 1 mark for two correct
particles in the wrong order
Notes
Total: 6
1
1
2
2
Marks
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
33
ACCEPT:
x same amount of limewater
x same temperature / Bunsen
setting
x same mass of solid
Any two from:
x same volume / concentration of limewater
x same flame e.g. “always roaring flame”
x same amount of solid
x same distance of flame to tube
x same form / state of division of solid e.g. “all powders”
(d)
Total: 6
max 2
1
ALLOW no carbon dioxide / gas given
off
(sodium carbonate / it) does not decompose
1
Marks
(c)
ALLOW CO2
Notes
2
copper(II) / copper (carbonate)
carbon dioxide
Answer
(because) limewater turned milky in least time / most quickly
(b)
4 (a)
Question
number
34
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
(c)
(b)
5 (a)
Answer
bitumen
(ii)
An explanation linking any four of the following:
x crude oil / vapour rises through the (fractionating) column
x idea of temperature gradient in column e.g. hotter at the
bottom than the top
x different fractions have different boiling point
x condense when they get to part of the column that has lower
temperature than their boiling point
x vapour passes through bubble caps / one-way valves OR idea
that liquid fractions cannot trickle back down because of
bubble caps
refinery gases
only
compounds / substances containing hydrogen and carbon
(i)
Question
number
ALLOW vaporising point / condensing
temperature
DO NOT ACCEPT atoms/elements in
place of compounds/substances
Notes
Total: 8
max 4
1
1
2
Marks
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SAMs
© Edexcel Limited 2011
35
(ii)
C10H22 ń C8H18 + C2H4
(c)
An explanation linking the following points:
x toxic / poisonous
x (because) it restricts blood carrying oxygen
1 mark for correct formula for alkane
1 mark for balanced equation
An explanation linking the following points:
x crude oil contains too many long chain hydrocarbons
x which are economically less useful / need converting to more
economically useful smaller hydrocarbons
(i)
cyclobutane: no change / remains orange
(iii)
but-1-ene: (bromine) turns (from orange to) colourless / decolourised
no double bond / saturated
but-2-ene
(ii)
(i)
Answer
(b)
6 (a)
Question
number
ACCEPT comments about binding to
haemoglobin / forming
carboxyhaemoglobin
ALLOW equations which finish:
ń C6H14 + 2C2H4
ń C4H10 + 3C2H4
ń C2H6 + 4C2H4
ACCEPT
x alkenes need in polymer
industry
x to make useful plastics
IGNORE starting colour of bromine
1 mark for formula
1 mark for name
Notes
Total: 11
2
2
2
2
1
2
Marks
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Edexcel Certificate in Chemistry
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Answer
Mg + CuSO4 Æ MgSO4 + Cu
gains (two) electrons
reduction
Any two from:
x (blue) colour of solution fades /solution turns colourless
x brown/pink/pink(y)-brown solid forms
x gets warm/hot
(i)
(ii)
(iii)
(c)
extra decimal place / trailing zero / to 0.01 g
1 mark for correct species
1 mark for balance
2Cl¯ ˆ Cl2 + 2e
Cathode = chlorine
Anode = copper
An explanation linking the following points:
x green colour spreads throughout liquid
x (because of) diffusion
Answer
(b)
8 (a)
Question
number
(c)
(b)
7 (a)
Question
number
NOT solution turns clear
ALLOW precipitate
ALLOW fizzing / bubbles
1 mark for reactants
1 mark for products
Notes
ALLOW 2Cl¯ - 2e ˆ Cl2
Award 1 mark for both correct
products, but at incorrect electrodes
ACCEPT dark green at bottom and
light green at top
Notes
Total: 7
max 2
1
1
2
1
Marks
Total: 6
2
2
2
Marks
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
37
A
E
(ii)
(iii)
C
(i)
35 (minutes)
(iii)
(c)
An explanation linking the following points:
x reaction rate slows down
x (because there are) fewer hydrogen peroxide particles
x (therefore) less frequent collisions/fewer collisions per
second
(ii)
catalyst
2 (cm3)
Answer
(i)
(b)
9 (a)
Question
number
ACCEPT any number between 30 and
35
ACCEPT hydrogen peroxide is less
concentrated
Notes
Total: 9
1
1
1
1
1
3
1
Marks
38
Edexcel Certificate in Chemistry
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© Edexcel Limited 2011
(c)
(b)
10 (a)
ACCEPT 0.8 cm (for candidates who
use their own ruler)
ALLOW consequential on answer to
(c)(i)
1.5 ± 0.1 (cm)
3.7 – 3.8 (cm3)
(i)
(ii)
Total: 9
1
1
max 4
Any two of the following pairs of statements:
x not left long enough
x therefore precipitate / solid not fully settled
OR
x too much potassium iodide added
x so more precipitate made
OR
x tube not vertical when precipitate was settling
x so precipitate not level in the tube
(ii)
ACCEPT reasonable alternatives, as
long as they explain why the height is
too high
1
correct point circled (at 12cm3 of lead(II) nitrate added)
Marks
(i)
ACCEPT any way in which this point is
indicated
Notes
2
Answer
An explanation linking the following points:
x more precipitate as more lead(II) nitrate present (to react
with potassium iodide)
x but eventually all potassium iodide used up / lead(II) nitrate
becomes in excess / the reaction finishes
Question
number
Edexcel Certificate in Chemistry
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© Edexcel Limited 2011
39
(d)
(c)
(b)
11 (a)
translating this ratio to a formula = NaClO3
simplest whole number ratio = 1:1:3
dividing by Ar values: Na 21.6/23
Cl = 33.3/35.5
iodine (formed, and it is brown in solution)
(iii)
calculation of % O = 45.1
displacement / redox
(ii)
2 Clî + I2
2(I–) and
7 electrons in outer shell
8 electrons in middle shell
An explanation linking the following points:
x 8 electrons in outer(most) shell
x does not easily/readily gain or lose electrons
Answer
(i)
Question
number
O = 45.1/16
Final answer consequential on slips in
calculation above
If division by atomic number, neither
2nd nor 3rd mark can be scored –
although 4th mark can (probably
NaClO3 or Na8Cl8O23)
I2
ACCEPT oxidation and reduction
1 mark – correct formulae
1 mark – correct balancing
ACCEPT dots, circles, crosses or e to
represent electrons
ACCEPT full outer(most) shell
ACCEPT argument based on energy
required
Notes
Total: 12
4
1
1
2
2
2
Marks
40
Edexcel Certificate in Chemistry
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© Edexcel Limited 2011
(d)
measure the boiling point / freezing point
(c)
any named gas that burns in oxygen to form water as a product
e.g. methane, ethane
100°C / 0°C
A description linking the following points:
x measure the volume of gas produced
x using a graduated test-tube / gas syringe / inverted measuring
cylinder
An explanation linking the following points:
x reaction rate is faster
x (therefore) counting bubbles is more difficult / bubbles may
form continuous stream
Answer
(b)
12 (a)
Question
number
ACCEPT correct formula for gas
boils at 100°C OR freezes at 0°C are
worth 2 marks
ACCEPT:
answers which lead to decreased rate
to allow bubble counting to work
e.g.
x reduced concentration of acid
/ larger pieces of zinc
x to slow rate / make bubbles
smaller
ACCEPT:
x bubbles may be different size
x so not valid / poor comparison
with first experiment
Notes
Total: 7
1
2
2
2
Marks
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
41
A description linking the following points:
x add aqueous sodium hydroxide (and warm)
x gas / ammonia (given off)
x turns (damp) red litmus blue
(f)
recirculated / recycled / re-used / returned to reaction chamber /
used to make more ammonia
(ii)
NH3 + HNO3 ń NH4NO3
An explanation linking the following points:
x ammonia has low boiling point / liquefies
x (therefore) mixture is cooled
(i)
(e)
(d)
An explanation linking four of the following points:
x increased pressure favours forward reaction / increases yield
x increased pressure also increases rate
x decreased temperature favours forward reaction / increases
yield
x decreased temperature decreases rate
x concluding comment e.g. greater yield, but probably at
reduced rate / increase in rate due to pressure cancels
decrease in rate due to temperature change
(c)
Concluding comment must be present to score full 4 marks, but can
be agreement or disagreement with scientist’s idea.
forward and reverse reactions are occurring
at same rate/speed
to speed up the reaction OR
to allow a lower temperature to be used but still have a reasonably /
acceptably fast reaction
Answer
(b)
13 (a)
Question
number
ACCEPT forms white smoke with HCl
ACCEPT good idea but increased
pressure increases cost
ACCEPT moves equilibrium to right
ACCEPT moves equilibrium to right
ACCEPT amounts of reactants /
products / macroscopic properties
remain constant
ACCEPT to lower the activation
energy / achieve a better balance of
yield and rate
Notes
Total: 14
3
1
1
2
max 4
2
1
Marks
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Edexcel Certificate in Chemistry
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(d)
(c)
(b)
14 (a)
(ii)
(i)
An explanation linking any two of the following points:
x small molecules
x weak (attractive) forces between molecules
x (therefore) little energy required to overcome forces /
separate molecules
exothermic, because it burst into flames
6 × 18 = 108
257 / 108 = 51.4 / mass water
mass water = 21.6 kg
(iii)
x
x
x
moles phosphine = 51400 / 257
moles water = moles phosphine × 6
mass water = moles water × 18 = 21600 g / 21.6 kg
low / small
OR
x
x
x
(65 × 3) + (31 × 2)
= 257
An explanation linking the following points:
x ions are not free to move in solid (IGNORE ref to electrons)
x (however) ions are free to move when molten
P3î
Answer
(ii)
(i)
(ii)
(i)
Question
number
Total: 14
max 2
2
1 mark for 3 bonding pairs
1 mark for non-bonding pair
ACCEPT “weak bonds”, but not
“weak covalent bonds”
1
1
3
2
2
1
Marks
NOT just ‘exothermic’
ACCEPT answer in g or kg, as long as
unit matches value
Mark consequentially on (b)
Award 1 mark for correct use of Mr of
Zn and P
REJECT any mention of electron
movement
ACCEPT Pî3
Notes
Write your name here
Surname
Other names
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S41078A
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Edexcel Certificate in Chemistry
*S41078A0115*
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43
44
Edexcel Certificate in Chemistry
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Answer ALL questions.
1 Lithium sulfate (Li2SO4) is used in some medicines. The presence of lithium sulfate in
a medicine can be shown by two tests.
(a) A flame test can be used to show that the medicine contains lithium ions.
State the colour that lithium ions produce in a flame.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) A sample of a medicine containing lithium sulfate is dissolved in water.
(i)
Describe how you would test the solution for the presence of sulfate ions.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(ii) Write a chemical equation for the reaction occurring in (b)(i).
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 1 = 6 marks)
Edexcel Certificate in Chemistry
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45
2 Ethanol can be manufactured by two different methods. The table gives some
information about these two methods.
Raw material
Quality of ethanol
produced
Method A
crude oil
pure
Method B
sugar cane
impure
(a) In method A, ethanol is formed in the final step.
(i)
Identify the two compounds that react together to form ethanol.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............
and
................................................................................................................ . . . . . . . . . . . . . . . . .
(ii) State two conditions used in this reaction.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) The equation for the reaction that occurs in method B is
C6H12O6 o 2C2H5OH + 2CO2
(i)
Name the compound with the formula C6H12O6.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(ii) Identify the main impurity in the ethanol formed in this reaction.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
46
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(c) Some of the ethanol produced by method B is converted into ethene by heating it
with a catalyst.
(i)
Name the catalyst used in this reaction.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Name the type of reaction.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iii) Write the chemical equation for this reaction.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) Some of the ethanol produced by method B is used as a fuel. Balance the
chemical equation for the complete combustion of ethanol.
(1)
C2H5OH +
……. . . . . . . . ….
O2 o … … ........… . CO2 +
… … ........… .
H2 O
(Total for Question 2 = 10 marks)
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47
3 Margaret goes on holiday to the seaside.
She notices some iron railings on the beach that are often in contact with the
seawater. They are very rusty.
The iron railings in front of her hotel, some distance from the sea, are much less rusty.
Margaret predicts that seawater makes iron rust faster than rain water.
(a) Describe an experiment that Margaret could carry out to test her prediction.
(5)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Why is rusting described as an oxidation reaction?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 3 = 6 marks)
48
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4 The gas hydrogen chloride, HCl, dissolves in water. The solution in water turns blue
litmus paper red.
(a) (i) This solution of hydrogen chloride in water contains two ions.
Give the formula of each ion.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..............
and ................................................................................................................ . . . . . . . . . . . . . . . . . .
(ii) What is the name given to a solution of hydrogen chloride in water?
(1)
(b) Hydrogen chloride gas also dissolves in methylbenzene. This solution has no
effect on blue litmus paper.
A student sets up two test tubes, one containing a solution of hydrogen
chloride in water and the other containing a solution of hydrogen chloride in
methylbenzene.
He adds a piece of magnesium ribbon to each test tube.
Compare the results that he would observe in both test tubes.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 4 = 6 marks)
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5 Polymers can be classified as addition polymers or condensation polymers.
(a) An addition polymer can be formed from the monomer C3H6
(i)
Name this monomer and the addition polymer it forms.
(1)
Monomer
.................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....................................... ..................................................................................................... . . . . . . . . . . . . . . . . .
Polymer ........................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ . . . . . . . . . . . . . . . . . .
(ii) Explain why there are problems with the disposal of addition polymers.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Superglues are liquid adhesives that easily form addition polymers, giving a solid
that sticks objects together firmly. The repeat unit of a superglue polymer is
shown below.
H CN
C
C
H COOCH3
Draw the structure of the monomer used to make this polymer.
(1)
50
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(c) Nylon is an example of a condensation polymer.
Describe one difference between a condensation polymer and an addition
polymer.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 5 = 6 marks)
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51
6 Potassium chloride is a soluble salt. It can be prepared by reacting together solutions
of potassium hydroxide and hydrochloric acid.
(a) A student did a titration to find the volume of hydrochloric acid needed to react
with 25.0 cm3 of potassium hydroxide solution, KOH.
Exactly 25.0 cm3 of potassium hydroxide solution and a few drops of methyl
orange indicator were added to a conical flask.
Hydrochloric acid was then added until a colour change was seen.
(i)
State the type of reaction occurring between potassium hydroxide and
hydrochloric acid.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Write a chemical equation for this reaction.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iii) State the final colour of methyl orange in the titration.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iv) The diagrams show the readings on the burette at the start and at the end of
a titration.
End
Start
1
28
2
29
3
30
Use these diagrams to complete the table, entering all values to the nearest
0.05 cm3.
(3)
Burette reading at end in cm3
Burette reading at start in cm3
Volume of acid added in cm3
52
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
(b) Another student did the titration and recorded these results.
Burette reading at end in cm3
27.35
28.50
27.30
29.15
Burette reading at start in cm3
0.20
1.80
1.20
2.65
Volume of acid added in cm3
27.15
26.70
26.10
26.50
Titration results to be used (9)
(i)
Concordant results are those that differ from each other by 0.20 cm3 or less.
Identify the concordant results by placing ticks (9) in the table as shown.
(1)
(ii) Use your ticked results to calculate the average volume of acid added.
(2)
Average volume =
Edexcel Certificate in Chemistry
SAMs
........................................................
cm3
© Edexcel Limited 2011
53
(c) A student was asked to suggest a method of obtaining pure, dry crystals of
potassium chloride from the dilute solution of potassium chloride formed in the
titration.
This is her suggested method.
Ɣ
Pour the neutral potassium chloride solution from the conical flask into an
evaporating basin.
Ɣ
Heat the solution until it has been bubbling for a few minutes.
Ɣ
Stop heating and leave it until crystals start to form.
Ɣ
Pour the liquid away so the crystals are left behind.
Ɣ
Scrape the crystals onto some blotting paper and to dry them.
Identify two problems with the student’s method. For each problem, suggest an
improvement to the method to overcome the problem.
You may assume that the student is working safely.
(4)
Problem 1................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....................................... ...................................................................................................... . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
Improvement .......... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................................................ ............................................................................................ . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
Problem 2................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....................................... ...................................................................................................... . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
Improvement ......... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .................................................. .......................................................................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
54
Edexcel Certificate in Chemistry
SAMs
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(d) In another titration, some potassium hydroxide solution was neutralised by
sulfuric acid. The equation for the reaction is
2KOH + H2SO4 o K2SO4 + 2H2O
A 25.0 cm3 sample of 0.200 mol/dm3 potassium hydroxide was neutralised by
28.40 cm3 of sulfuric acid.
(i)
Calculate the amount, in moles, of potassium hydroxide used.
(2)
(ii) Calculate the amount, in moles, of sulfuric acid used.
(1)
(iii) Calculate the concentration, in mol/dm3, of the sulfuric acid.
(2)
(Total for Question 6 = 18 marks)
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
55
7 Lansfordite is the common name for a form of hydrated magnesium carbonate,
MgCO3.xH2O.
This formula shows that lansfordite contains water of crystallisation. When a sample
of lansfordite is heated gently, the water of crystallisation is given off and eventually
anhydrous magnesium carbonate is left.
A teacher gave 5.0 g samples of powdered lansfordite to some students and told each
student to heat the sample, then to let it cool and reweigh it.
The students heated the samples for different times. The teacher recorded their
results in a table.
Length of time heated in min
0.0
1.0
3.0
3.5
4.0
4.5
6.0
Mass of sample after heating in g
5.0
4.4
3.3
3.0
2.7
2.4
2.4
(a) Plot a graph of these results on the grid. The last two results have been plotted for
you.
Draw a straight line of best fit through the points you have plotted.
5.0 –
4.0 –
Mass of sample
after heating
in g
3.0 –
–
–
–
–
–
–
–
2.0 –
0
1
2
3
4
5
6
Length of time heated in min
(3)
(b) Use your graph to predict the mass of a sample after heating for 2.0 minutes.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
56
Edexcel Certificate in Chemistry
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(c) Suggest why the masses of the samples after heating for 4.5 minutes and after
heating for 6.0 minutes were the same.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) The teacher told one of the students that the amount of hydrated salt in a sample
of lansfordite was 0.030 mol, and that the amount of water lost on heating was
0.15 mol.
Calculate the value of x in the formula MgCO3.xH2O
(1)
(e) When anhydrous magnesium carbonate is heated strongly it decomposes. The
equation for the reaction is:
MgCO3(s) o MgO(s) + CO2(g)
Calculate the volume, in dm3, of carbon dioxide formed when 0.030 mol of
anhydrous magnesium carbonate is completely decomposed.
(You may assume that the molar volume of a gas is 24 dm3)
(2)
(Total for Question 7 = 8 marks)
TOTAL FOR PAPER = 60 MARKS
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
57
58
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
59
(b)
1 (a)
barium chloride / barium nitrate (solution)
(dilute) hydrochloric acid / nitric acid
white precipitate
BaCl2 + Li2SO4 ĺ BaSO4 + 2LiCl
(ii)
red
Answer
(i)
Question
number
Paper 2C
Sample Mark Scheme
1 mark for formula of BaSO4
1 mark for rest of equation
ACCEPT correct ionic equation
ACCEPT solid / suspension / ppt(e)
ACCEPT correct formulae
IGNORE qualifiers such as pale / dark
NOT ‘brick red’
Notes
Total: 6
2
3
1
Marks
60
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
(d)
(c)
(b)
2 (a)
C2H5OH ĺ C2H4 + H2O
(iii)
3 O2 AND 2 CO2 AND 3H2O
dehydration
(ii)
aluminium oxide
water / H2O
(ii)
(i)
glucose
Any two from:
300 ºC (+/– 50 ºC)
60 – 70 atm
phosphoric acid (catalyst)
(ii)
(i)
ethene / C2H4
water / steam / H2O
(i)
Question
number
Answer
ACCEPT multiples
ACCEPT porous pot / conc. sulfuric
acid / conc. phosphoric acid
NOT sugar
ACCEPT in either order
Notes
Total: 10
1
1
1
1
1
1
max 2
2
Marks
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
61
(b)
3 (a)
Question
number
involves gain / addition of oxygen
A description linking five of the following points:
x set up tubes containing iron (nail) in rainwater and iron (nail)
in seawater
x control tube / tube with iron (nail) and no water
x same mass of iron (nail) / same volume of water
x leave tubes for same length of time / stated time interval
x method to measure rusting e.g. colour change / mass change
x repeat experiment / more than one set of tubes set up
Answer
ACCEPT involves loss of electrons /
increase in oxidation number
Notes
Total: 6
1
max 5
Marks
62
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
(b)
4 (a)
hydrochloric acid
(ii)
Answer
hydrogen chloride in water:
any two from:
bubbles / fizzing / gas produced
magnesium ribbon gets smaller / reacts away / disappears
test tube becomes warm
hydrogen chloride in methylbenzene:
no reaction / no bubbles / magnesium does nothing
H+ / H3O+
Clî
(i)
Question
number
NOT ‘hydrogen produced’
NOT ‘magnesium dissolves’
NOTE candidates can only score full
marks by giving observations for
BOTH tubes
ACCEPT in either order
Notes
Total: 6
max 3
1
2
Marks
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
63
(c)
(b)
5 (a)
An explanation linking any two from:
x not biodegradable
x (because) they are inert
x (because) they have strong C-C / C-H bonds
(ii)
Any valid comparison e.g.
Addition: only one type of monomer reacts with itself
Condensation: two different monomers
OR
Addition: only one product formed
Condensation: forms another product / water / hydrogen chloride
H CN
| |
C=C
| |
H COOCH3
monomer = propene / propylene
AND
polymer = poly(propene) / polypropylene
Answer
(i)
Question
number
REJECT:
comparison of uses
ACCEPT:
differences in properties e.g.
Addition: inert
Condensation: may be hydrolysed /
broken down
IGNORE the geometry of the
molecule
Both must be correct for 1 mark
Notes
Total: 6
2
1
max 2
1
Marks
64
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
(b)
6 (a)
= 26.6(0)
26.70 + 26.50
2
28.75
2.20
26.55
(iv)
(ii)
orange
(iii)
ticks under 26.70 and 26.50
KOH + HCl ĺ KCl + H2O
(ii)
(i)
neutralisation
(i)
Question
number
Answer
2nd mark consequential on 1st
consequential on ticked results
NOT 2.2
3rd mark consequential on other two
ACCEPT red
ACCEPT exothermic
Notes
2
1
3
1
1
1
Marks
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
65
(d)
(c)
2nd mark consequential on 1st
IGNORE units and sig figs
ACCEPT correct answer from
incorrect (d)(ii)
0.0025 × 1000
28.4
(iii)
= 0.088(0)
ACCEPT answer from (d)(i) ÷ 2
2nd mark consequential on 1st
IGNORE units
0.0025
= 0.005(00)
0.200 × 25.0
1000
In each case, 1 mark for identifying
the problem; and 1 mark for a
correct suggestion for that problem
(ii)
(i)
P: blotting paper may not dry crystals completely
I: place crystals in (warm) oven to dry
P: crystals lost when solution poured off
I: filter / centrifuge / decant carefully to obtain crystals
P: liquid poured off when crystals start to form
I: leave to cool until crystallisation complete
P: solution heated for too little / too long a time
I: evaporate until crystallisation point / check solution with glass rod
Any two from the following:
P: initial solution contaminated with indicator
I: repeat titration / mix same volumes with no indicator / add
charcoal and filter (to remove indicator)
Total: 18
2
1
2
max 4
66
Edexcel Certificate in Chemistry
SAMs
© Edexcel Limited 2011
all water lost / same amount of water lost
5
24 × 0.03(0)
(c)
(d)
(e)
= 0.72 (dm3)
Answer in range 3.8 - 3.9 (g)
all points plotted correctly to nearest gridline
straight line through first 5 points
Answer
(b)
7 (a)
Question
number
Units not needed, but award max 1 if
incorrect units
ACCEPT reactions/decompositions
complete
Units not needed, but do not award
mark if incorrect units given
Consequential on candidate's line
Deduct 1 mark for each error
Notes
Total: 8
2
1
1
1
2
1
Marks
Level 1/Level2 Certificate
Physics (KPH0)
Sample Assessment Material
First examination June 2012
Contents
Paper 1P
Sample Assessment Material
Sample Mark Scheme
3
33
Paper 2P
Sample Assessment Material
Sample Mark Scheme
Edexcel Certificate in Physics
47
61
SAMs
© Edexcel Limited 2011
1
General Marking Guidance
x
All candidates must receive the same treatment. Examiners must mark the
first candidate in exactly the same way as they mark the last.
x
Mark schemes should be applied positively. Candidates must be rewarded for
what they have shown they can do rather than penalised for omissions.
x
Examiners should mark according to the mark scheme not according to their
perception of where the grade boundaries may lie.
x
There is no ceiling on achievement. All marks on the mark scheme should be
used appropriately.
x
All the marks on the mark scheme are designed to be awarded. Examiners
should always award full marks if deserved, ie if the answer matches the
mark scheme. Examiners should also be prepared to award zero marks if the
candidate’s response is not worthy of credit according to the mark scheme.
x
Where some judgement is required, mark schemes will provide the principles
by which marks will be awarded and exemplification may be limited.
x
When examiners are in doubt regarding the application of the mark scheme
to a candidate’s response, the team leader must be consulted.
x
Crossed out work should be marked UNLESS the candidate has replaced it
with an alternative response.
Codes:
ecf = error carried forward
2
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
Write your name here
Surname
Other names
Edexcel
Certificate
Centre Number
Candidate Number
Physics
Paper: 1P
Sample Assessment Material
Time: 2 hours
Paper Reference
KPH0/1P
You must have:
Ruler, protractor, calculator
Total Marks
Instructions
black ink or ball-point pen.
t Use
in the boxes at the top of this page with your name,
t Fill
centre number and candidate number.
all questions.
t Answer
the questions in the spaces provided
t Answer
– there may be more space than you need.
t Show all the steps in any calculations and state the units.
Information
total mark for this paper is 120.
t The
marks for each question are shown in brackets
t The
– use this as a guide as to how much time to spend on each question.
Advice
Read each question carefully before you start to answer it.
t Keep
on the time.
t Write anyoureyeanswers
and in good English.
t Try to answer everyneatly
t Check your answersquestion.
if you have time at the end.
t
Turn over
S41080A
©2011 Edexcel Limited.
Edexcel Certificate in Physics
*S41080A0130*
SAMs
© Edexcel Limited 2011
3
EQUATIONS
You may find the following equations useful.
energy transferred = current × voltage × time
E=I×V×t
pressure × volume = constant
p1 × V 1 = p 2 × V 2
pressure
= constant
kelvin temperature
p1 p2
=
T1 T2
frequency =
1
time period
f =
1
T
power =
work done
time taken
P=
W
t
power =
energy transferred
time taken
P=
W
t
v=
2 ×π × r
T
orbital speed =
2π × orbital radius
time period
Where necessary, assume the acceleration of free fall, g = 10 m/s2.
4
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
Answer ALL questions.
1 The Solar System contains planets, comets and satellites.
(a) Answer the following questions by placing a cross ( ) in the appropriate box.
(i)
When one object goes around another in space, it follows a path called
(1)
A a circle
B an equator
C an orbit
D an oval
(ii) Which force is responsible for planets following their paths around the Sun?
(1)
A friction
B gravity
C magnetism
D upthrust
(iii) Which force is responsible for artificial satellites following their paths around
the Earth?
(1)
A friction
B gravity
C magnetism
D upthrust
(iv) Moons are natural satellites of
(1)
A asteroids
B comets
C planets
D stars
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
5
(b) State one similarity in the movement of planets and comets.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) State one difference between the movement of planets and comets.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) Explain how the speed of a comet changes as it moves.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 1 = 8 marks)
6
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
2 A student is investigating how the extension of a spring varies when she changes the
force stretching it.
The photograph shows how she sets up her experiment.
spring
hanging
mass
100 g
masses
The student has a ruler marked in centimetres.
Each mass is marked ‘100 g’.
The student writes the following plan:
x
x
x
x
I will hang 100 g on the spring.
I will hold the ruler next to the spring and measure the length of the spring.
I will add another mass and measure the length again.
I will repeat this process until I have enough measurements.
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
7
(a) Explain how the student could improve her plan to make her measurements more
accurate.
(5)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) State, with a reason, a suitable safety precaution the student should take when
carrying out her experiment.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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8
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(c) Describe how the student should convert her measurements of mass into forces.
(2)
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(d) The student plots a graph of force against extension.
She finds that the spring obeys Hooke’s law.
On the axes below, sketch the line she gets.
(2)
Force in N
0
Extension in cm
(Total for Question 2 = 10 marks)
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9
3 A triathlon race has three parts: swimming, riding a bicycle and running.
(a) The diagram shows the force responsible for the forward movement of an athlete
in the swimming part of the race.
Label the diagram to show two other forces acting on the athlete.
(2)
(b) The table shows the distance of each part of a triathlon race and the time an
athlete takes for each part.
Part of race
Distance in m
Time in s
1 500
1 200
riding a bicycle
40 000
3 600
running
10 000
2 000
swimming
(i)
Calculate the athlete’s average speed for the whole race.
(2)
Average speed =
10
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............................................................
m/s
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(ii) The graph shows how the distance varied with time for the running part of
the race.
10000
9000
8000
7000
6000
distance in m
5000
4000
3000
2000
1000
0
0
500
1000
time in s
1500
2000
Describe how the athlete’s speed changed during this part of the race.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 3 = 7 marks)
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11
4 Using mains electricity can be dangerous.
(a) Suggest two safety precautions you should take when putting a plug into a mains
socket.
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
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2 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
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(b) Mains electricity provides an alternating current (a.c.)
A battery provides direct current (d.c.)
Describe the difference between a.c. and d.c.
(2)
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(c) The photograph shows two mains plugs.
mains plug A
mains plug B
Mains plug A has a connection for an earth wire.
Mains plug B does not have an earth connection.
(i)
Describe how the earth wire can act together with a fuse as a safety device.
(2)
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(ii) Explain why mains plug B can be safe to use even though it has no earth
connection.
(2)
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(d) A fuse is rated at 13 A.
The mains voltage is 230 V.
Calculate the maximum power that can be supplied using this fuse.
State the correct unit in your answer.
(3)
Maximum power = .................................................. Unit
............................... . . . . . . . . . . . . . . . . . . .
(Total for Question 4 = 11 marks)
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13
5 Two students notice some small objects falling from a tree.
The objects have wings that make them spin around and fall slowly.
seed
wing
The students find out that this is the way that the tree spreads its seeds.
They decide to use these ‘winged seeds’ for an investigation.
They drop several seeds from a window and collect the data shown in the table.
Average mass of a winged seed
0.25 g
Vertical distance fallen
5m
Average time taken for a winged seed to fall
12 s
(a) Explain why it is a good idea to use a distance of 5 m in this experiment.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) Describe how the students should find the average mass of a winged seed.
(2)
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) (i)
State the equation linking gravitational potential energy, mass, g and height.
(1)
(ii) Calculate the average gravitational potential energy lost by one winged seed
as it falls a vertical distance of 5 m.
(2)
Gravitational potential energy =
..............................................
J
(iii) Describe what happens to this energy.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 5 = 9 marks)
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6 Electromagnetic waves called T-rays (short for tera-rays) are used in some airport
security scanners.
T-rays:
x pass through clothes
x bounce off the human body
x do not pass through or bounce off metal.
(a) Put a cross (8) in the appropriate box to indicate the correct ending for each
sentence.
(i)
T-rays are absorbed by
(1)
clothes
the human body
metal
(ii) T-rays are reflected by
(1)
clothes
the human body
metal
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(b) (i)
State the equation linking wave speed, frequency and wavelength.
(1)
(ii) T-rays have a wavelength of 3 × 10–4 m and travel at a speed of 3 × 108 m/s.
Calculate the frequency of T-rays.
State the correct unit in your answer.
(3)
Frequency = .................................................. Unit
............................... . . . . . . . . . . . . . . . . . . .
(iii) The table shows data for some waves in the electromagnetic spectrum.
Type of wave
Typical wavelength
Radio waves
Microwaves
T-rays
Infrared waves
30 m
3 × 10–2 m
3 × 10–4 m
3 × 10–6 m
A student concludes:
I think that the airport scanners are safe to use because
T-rays have a long wavelength.
Evaluate the student’s conclusion.
(2)
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(Total for Question 6 = 8 marks)
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17
7 Radioactive materials emit different types of ionising radiation.
(a) Complete this table for ionising radiations.
(3)
Type of radiation
alpha
Nature of radiation
Charge
two neutrons and
two protons
beta
negative
an electromagnetic wave
zero
(b) A nucleus decays and emits an alpha particle.
State the result of this decay on the atomic (proton) number and mass (nucleon)
number of the nucleus.
(2)
atomic (proton) number
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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mass (nucleon) number
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(c) Describe how radioactivity can be used to estimate the age of archaeological
discoveries such as wooden boats and animal bones.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 7 = 9 marks)
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19
8 A student is investigating the relationship between voltage and current.
(a) State the equation linking voltage, current and resistance.
(1)
(b) The meters show the current in a resistor and the voltage across it.
Current in mA
(i)
Voltage in V
Complete this table by recording the readings shown on the meters.
Give your values to an appropriate precision.
(1)
20
Current
in mA
0.20
0.60
1.01
1.14
1.81
2.22
Voltage
in V
1.0
3.0
5.0
7.0
9.0
11.0
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(ii) Use the data in the table to draw a graph of current against voltage.
(5)
(iii) Circle the anomalous point on the graph.
(1)
(iv) How did you decide that this point was anomalous?
(1)
............................................................................................................................... ....................................................
............................................................................................................................... ....................................................
............................................................................................................................... ....................................................
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21
(v) Use your graph, or the table, to find the resistance of the resistor that the
student used.
(2)
Resistance = .................................................. Ω
(c) The student wants to investigate the effect of changing light intensity on a circuit.
The student sets up equipment outside in a garden for an experiment lasting 24 hours.
The student uses the circuit shown below.
A
X
V
(i)
Give the name of the component labelled X.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(ii) List the variables that the student should measure.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(iii) Explain why the student might need help to take all the readings for this
investigation.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(iv) The graph below shows some results of the student’s investigation.
Label both axes with appropriate quantities and units.
(2)
600
500
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . .
400
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . .
300
200
100
0
0.00
6.00
12.00
18.00
24.00
. . . . . . . . . . . . . . . . . . . . . . . . . ..................................................................................................... ................................
(Total for Question 8 = 18 marks)
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23
9 Energy can be transferred by radiation, conduction or convection.
(a) Compare the processes of transferring energy by conduction and transferring
energy by convection.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) Convection was used in the past to ensure that miners who worked underground
had a fresh air supply to breathe.
The diagram shows a mine. A fire has been lit in a furnace at the bottom of one
shaft.
furnace
(i)
Explain how lighting a fire in this way helped to keep a supply of fresh air
moving through the mine.
You may draw on the diagram above to help illustrate your answer.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(ii) In an earlier system, the fire was lit at the surface of the mine.
chimney
fire in a furnace
This system was less effective at keeping fresh air moving through the mine.
Suggest why.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 9 = 8 marks)
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25
10 A student compares two electric lamps.
The lamps have the same brightness.
Type of lamp
Electrical energy
transferred
in J/s
Useful light energy
emitted
in J/s
filament lamp
energy-saving lamp
100
20
5
5
(a) Both lamps waste energy.
(i)
How much energy does the filament lamp waste each second?
(1)
...........................................................
J
(ii) Describe what happens to the energy wasted by the filament lamp.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
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(b) (i)
Calculate the efficiency of the energy-saving lamp.
(2)
Efficiency =
..............................................................
(ii) Sketch a labelled Sankey diagram to show the energy transfers in the energysaving lamp.
(3)
(c) The lamps in the student’s house are connected in parallel.
State two benefits of connecting lamps in parallel.
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
2 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(Total for Question 10 = 10 marks)
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27
11 A student investigates electromagnetic effects.
(a) Firstly, he tests this circuit.
magnet
switch
two horizontally
clamped copper rods
thick
copper
wire
battery
When he presses the switch, the thick copper wire rolls along the clamped
copper rods, away from the magnet.
(i)
Explain why this happens.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(ii) On the diagram, draw an arrow to show the direction of the current in the
circuit when the switch is pressed.
(1)
(iii) State two changes the student could make so that the copper wire moved
away more quickly when he pressed the switch.
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
2 . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............. .............................................................................................................................. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
28
Edexcel Certificate in Physics
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(b) The student investigates another effect using a coil of wire, a sensitive meter and a
magnet.
motion
meter
When he moves the magnet towards the coil, the meter gives a reading to the
right.
(i)
What is the name of this effect?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) State two changes the student could make so that the meter gives a larger
reading to the right.
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
2 . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............. .............................................................................................................................. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iii) How could the student make the meter give a reading to the left?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 11 = 10 marks)
Edexcel Certificate in Physics
SAMs
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29
12 The human eye contains liquid.
The liquid exerts a pressure on the inside of the eye.
This pressure is higher than atmospheric pressure from the air on the outside of the
eye.
(a) Explain, in terms of molecular motion, how the air exerts a pressure on the outside
of the eye.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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Edexcel Certificate in Physics
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(b) A doctor uses a tonometer to measure the excess pressure (how much higher the
pressure is than atmospheric pressure) of the liquid in the eye.
The tonometer pushes on the person’s eye with a very small force.
tonometer
eye
direction
of small
force
The tonometer pushes on the eye with a force of 0.015 N.
The tonometer touches an area of 7.35 × 10–6 m2.
Show that the pressure that the tonometer exerts is about 2 kPa.
(3)
Edexcel Certificate in Physics
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31
(c) Doctors think that a healthy excess pressure in the eye is ‘about 15 mm Hg’.
This equals the pressure difference produced by a 0.015 m column of mercury.
The density of mercury is 13 600 kg/m3.
Explain whether or not the excess pressure of 2 kPa in part (b) is healthy for the
eye.
Use a suitable calculation to support your answer.
(5)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 12 = 12 marks)
TOTAL FOR PAPER = 120 MARKS
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Edexcel Certificate in Physics
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Edexcel Certificate in Physics
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© Edexcel Limited 2011
33
C
(iv)
(d)
Answer
An explanation linking the following:
x the comet travels faster when it is nearer the Sun / the comet
is travelling at 2›r/T
x (because) the gravitation attraction from the Sun is stronger
when the comet is close / the force of gravity from the Sun is
stronger when the comet is closer
shape of orbit
B
(iii)
(c)
B
(ii)
both orbit Sun
C
(i)
(b)
1 (a)
Question
number
Paper 1P
Sample Mark Scheme
ACCEPT a reasonable alternative
ACCEPT period of orbit
Notes
Total: 8
2
1
1
1
1
1
1
Marks
34
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
wear eye protection
(as there is a) risk of spring 'flying back' into face
OR
care against tipping over / clamp the stand (with a G clamp)
(as there is a) risk of falling onto feet /sending spring flying
OR
protection on floor/desk / use as low a height as possible
(as there is a) risk of damage to feet
the force she needs is the weight of the masses
and W = mg
OR
convert mass to kg
multiply by g
straight line
through the origin
(c)
(d)
An explanation linking five of the following:
x check each mass on scales/balance
x use a ruler marked in mm / smaller division
x fix ruler in clamp (next to the spring), with the zero next to
start of the spring
x check the ruler is vertical with a suitable device eg set square
x attach marker/pin to top/bottom of spring
x measure at eye level to avoid parallax
Answer
(b)
2 (a)
Question
number
REJECT “multiply by 10” unless it is
clear that this is g
Reason given must match the
precaution
Precaution must be relevant to the
experiment
Notes
Total: 10
2
2
1
max 5
Marks
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
35
(ii)
A description including three from:
x starts with constant speed
x slows down
x speeds up again
x correct ref to slope
x correct ref to coordinates
51500 y 6800 = 7.57 (m/s)
total distance (51 500) and total time (6800) seen
(b)
(i)
Any two forces correctly shown on diagram from:
x drag
x gravity
x upthrust
Answer
3 (a)
Question
number
ACCEPT 7.6 (m/s)
Each force arrow must be in the
correct direction
Notes
Total: 7
max 3
2
max 2
Marks
36
Edexcel Certificate in Physics
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© Edexcel Limited 2011
(d)
(c)
(b)
4 (a)
(ii)
(i)
Question
number
ACCEPT 2.99 kW / 3000 W / 3 kW
Unit mark independent of answer
unit (W or J/s)
ALLOW:
turn socket off
keep metal objects away from pins
Notes
answer = 2990
statement of P = IV or 13 × 230 seen
An explanation linking two of the following:
x term double insulation (applied to plug, cable or appliance)
x idea that insulation stops current / does not conduct
x idea that electric shocks are currents
x idea of a second insulation layer in case the first fails
A description including two from:
x large current in earth wire / charge flows to earth
x large current in fuse
x fuse melts / blows / breaks circuit
x stopping electrocution
a.c. – electron/current motion reverses (regularly)
d.c. – electrons/current motion only in one direction
Any two of:
x beware of frayed cable
x beware of damaged plug
x beware of water
Answer
Total: 11
3
max 2
max 2
2
max 2
Marks
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
37
(transferred to) thermal (heat) energy in the surroundings
ACCEPT sound
answer = 0.0125 (J)
(transferred to) kinetic energy (of the seed)
ALLOW 1 mark if 0.25g used, giving
12.5J
substitution (0.00025 × 10 × 5)
(ii)
(iii)
ecf on equation in (i)
GPE = m × g × h
(i)
(c)
if left blank, can credit correct
statement of equation seen in (ii)
Notes
A description including:
x method of measuring mass e.g. scales / balance
x with EITHER idea of őn OR idea of repeated readings
An explanation linking the following:
x improves accuracy / reduces % uncertainty
x (because) allows longer time measurement / reduces impact of
reaction time
Answer
(b)
5 (a)
Question
number
Total: 9
2
2
1
2
2
Marks
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Edexcel Certificate in Physics
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© Edexcel Limited 2011
(b)
6 (a)
(iii)
rearrangement / substitution : f = 3 × 108 ÷ 3 × 10-4
(ii)
Agreement with the conclusion:
x T-rays do not penetrate the human body
x (because) T-rays are reflected / bounce off
Disagreement with the conclusion:
x T-rays have shorter wavelength / higher frequency / more
energy (than radio / microwave) or appropriate correct
reference to wavelengths
x (likely to) cause increase of named detrimental effect (e.g. skin
burns)
OR
An explanation linking the following:
unit = Hz / s-1
answer = 1 x 1012
v=fũ
the human body
(ii)
Answer
(i)
metal
(i)
Question
number
NB there is no mark for stating
agreement / disagreement with the
conclusion
Unit mark independent of answer
if left blank, can credit correct
statement of equation seen in (ii)
ecf for omitted equation in (i)
Notes
Total: 8
2
3
1
1
1
Marks
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
39
(c)
(b)
7 (a)
Question
number
electron / e
Nature of
radiation
positive
Charge
A description including any four from:
x (living things contain) carbon (14)
x C14 is a radioactive isotope / beta emitter
x (radio)activity decreases (over time)
x (estimate) half-lives (since material was alive)
x compare activity (of sample now with living tissue) / ratio of
C14 to C12 is fixed in living material
mass number: decreases by four
atomic number: decreases by two
gamma / J
Type of
radiation
Answer
ACCEPT +ve / 2+ / +2
Notes
Total: 9
max 4
2
3
Marks
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Edexcel Certificate in Physics
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© Edexcel Limited 2011
(b)
8 (a)
2.62 and 13.0
suitable scale chosen (>50% of grid used) ;
line of best fit acceptable ;
axes labelled with scales and units ;
plotting to nearest half square (minus one for each error) ;;
1.14, 7.0 identified / circled
does not fit with the pattern of the others / well away from the line
conversion of reading from graph from mA to A
answer = 4950 ± 50 (ö)
(ii)
(iii)
(iv)
(v)
voltage = current × resistance
Answer
(i)
Question
number
4.95 (± 0.05) scores 2nd mark only
4.95 (± 0.05) kö scores both marks
deduct 1 mark for each incorrect plot
NOT 13.00
ACCEPT V = IR or rearrangement
Notes
2
1
1
1
1
1
2
1
1
Marks
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
41
(c)
light dependent resistor
time
voltage and current
An explanation linking two of the following:
x difficulty in taking readings over long time
x difficulty in taking two or more readings simultaneously
x appropriate named simultaneous readings (e.g. time and
resistance; voltage and current; time, voltage and current)
x idea that second person / datalogger could assist with above
resistance in ohms
time in hours / time of day / clock time
(i)
(ii)
(iii)
(iv)
both quantities but no units – 1 mark,
both units but no quantities – 1 mark
2
ACCEPT “time of day” for time
ACCEPT resistance
Total: 18
2
max 2
1
ACCEPT LDR
42
Edexcel Certificate in Physics
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© Edexcel Limited 2011
(b)
9 (a)
heated air only rises from surface
(ii)
air in shaft only 'drawn up', not rising itself
OR convection currents are not set up as efficiently
A explanation linking the following:
x heated air expands / becomes less dense
x (therefore) rises (up the shaft)
x (this) sets up convection current so fresh air moves down other
shaft
CONVECTION:
x particles able to move
x transfer the energy by their movement / kinetic energy
CONDUCTION:
x from particle to particle
x by collision
Any three from:
Answer
(i)
Question
number
Notes
Total: 8
2
3
max 3
Marks
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
43
(c)
(b)
10 (a)
(ii)
failure of one allows others to continue working
independent control
at least 2 correct labels
widths of arrows in proportion
recognisable Sankey diagram
answer = 0.25
equation / substitution of values = 5 ÷ 20
A description including two from:
x converted / transformed
x into thermal energy
x dissipated to surroundings
(ii)
(i)
95 (J)
Answer
(i)
Question
number
ALLOW reverse arguments based on
problems with series connection
Points in either order, and could be
explained with a diagram
ALLOW 25 %
ALLOW heat for thermal energy
Notes
Total: 10
2
3
2
max 2
1
Marks
44
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
11
(b)
(a)
Any two from:
x stronger magnet
x more turns (on coil)
x move faster (towards coil)
x lower resistance wire
move magnet away from coil / turn the magnet round / reverse
connections on the meter
(ii)
(iii)
Any two from:
x higher current / higher voltage
x lower resistance wires
x stronger magnet
(iii)
electromagnetic induction
arrow indicating anticlockwise direction somewhere in or near the
electric circuit
(ii)
(i)
An explanation linking three of the following:
x current in the (thick) copper wire
x sets up a magnetic field (around it)
x which interacts (OWTTE) with the field of the magnet
x there is a force on the wire
Answer
(i)
Question
number
NOT bigger magnet
NOT more coils
ALLOW generator effect
NOT bigger magnet
Notes
Total: 10
1
max 2
1
max 2
1
max 3
Marks
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
45
(c)
(b)
12 (a)
Question
number
An explanation linking the following:
x uses formula : P = hŬg
x conversion of 15mm into m i.e. 0.015 m
x substitution : 0.015 u 13600 u 10
x answer = 2040 Pa
x appropriate comment about pressure being healthy
conversion to 2 kPa
answer = 2041 Pa
equation (pressure = force ÷ area) / substitution = 0.015 ÷ 7.35 u 10-6
An explanation linking four of the following:
x random motion (or air molecules)
x (create( impact(s) on outside of eye
x (particle’s) momentum/direction changes
x (therefore) force produced
x on the area outside (the eye)
x reference to pressure = force/area
Answer
ACCEPT similar reverse argument:
x uses formula : P = hŬg
x substitution : 2000 = h u 13600 u
10
x answer : h = 0.0147 m
x conversion of answer to mm i.e.
14.7 mm
x appropriate comment about
pressure being healthy
Notes
Total: 12
5
3
max 4
Marks
46
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
Write your name here
Surname
Other names
Edexcel
Certificate
Centre Number
Candidate Number
Physics
Paper: 2P
Sample Assessment Material
Time: 1 hour
Paper Reference
KPH0/2P
You must have:
Ruler, protractor, calculator
Total Marks
Instructions
black ink or ball-point pen.
t Use
in the boxes at the top of this page with your name,
t Fill
centre number and candidate number.
all questions.
t Answer
the questions in the spaces provided
t Answer
– there may be more space than you need.
t Show all the steps in any calculations and state the units.
Information
total mark for this paper is 60.
t The
marks for each question are shown in brackets
t The
– use this as a guide as to how much time to spend on each question.
Advice
Read each question carefully before you start to answer it.
t Keep
on the time.
t Write anyoureyeanswers
and in good English.
t Try to answer everyneatly
t Check your answersquestion.
if you have time at the end.
t
Turn over
S41081A
©2011 Edexcel Limited.
Edexcel Certificate in Physics
*S41081A0114*
SAMs
© Edexcel Limited 2011
47
EQUATIONS
You may find the following equations useful.
energy transferred = current × voltage × time
E=I×V×t
pressure × volume = constant
p1 × V 1 = p 2 × V 2
pressure
= constant
kelvin temperature
p1 p2
=
T1 T2
frequency =
1
time period
f =
1
T
power =
work done
time taken
P=
W
t
power =
energy transferred
time taken
P=
W
t
v=
2 ×π × r
T
orbital speed =
2π × orbital radius
time period
Where necessary, assume the acceleration of free fall, g = 10 m/s2.
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Answer ALL questions.
1 The bar chart shows the energy sources used by a country.
45
40
35
Percentage of
energy (%)
30
25
20
15
10
5
0
coal
oil
gas
nuclear
wind
solar
tidal
Energy source
(a) Give the name of one of the renewable energy sources shown in the chart.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Give the name of one of the fossil fuels shown in the chart.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) Calculate the total percentage of energy supplied by all the fossil fuels shown in
the chart.
(1)
Percentage supplied = ..................................... %
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(d) Describe the advantages and the disadvantages of using fossil fuels as energy
sources.
(5)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 1 = 8 marks)
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2 A student investigates how well three different materials conduct heat.
She places some ice on the material she is testing and measures the time taken for
the ice to melt.
She carries out the test three times for each material and calculates the average time.
ice
metal
(a) (i)
State two variables that the student should keep the same throughout her
investigation.
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
2 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
(ii) Why is it important that she keeps these variables the same?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) The student collects the results shown in the table.
Time for ice to melt in s
1st test
2nd test
3rd test
Average
time for ice
to melt in s
wood
338
325
303
322
plastic
372
770
388
510
metal
93
83
88
88
Material
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(i)
Give a reason why she tests each material more than once.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(ii) The time of 770s for plastic is an anomalous result.
Suggest how the student should deal with this.
(2)
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(c) Describe how the arrangement and motion of the particles in the ice change as
the ice melts.
You may draw diagrams to help your description.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 2 = 9 marks)
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3 In some countries, drivers and passengers in cars are required by law to wear seat
belts.
Seat belts are designed to reduce the risk of injury during a collision.
(a) Use ideas about momentum to explain how seat belts reduce the risk of injury
during a collision.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) Some people disagree with laws making the wearing of seat belts compulsory.
They agree that wearing seat belts reduces the risk of injury to people in the car.
However they say that the risk to other road users might be increased.
Suggest why it would be difficult to collect evidence to test this idea.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 3 = 5 marks)
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4 A student investigates total internal reflection of light inside semicircular blocks.
The photograph shows the path followed by a ray of light in a plastic block.
(a) The student draws this diagram of the apparatus.
plastic block
normal
(i)
On the diagram, mark and name the two angles that the student should
measure.
(2)
(ii) Describe how the student should measure and record the angles.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(iii) State how these two angles are related.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) The student repeats the experiment with a glass block instead of the plastic one.
The light emerges from the block in a different place.
42º
glass block
normal
(i)
What name is given to the angle marked 42º in the diagram?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Calculate the refractive index of the glass.
(sin 42º = 0.6691)
(3)
Refractive index = .........................................................................
(Total for Question 4 = 10 marks)
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5 A student rubs a plastic rod with a cloth.
(a) (i)
The plastic rod gains a negative charge.
Explain why.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(ii) Describe experiments the student could do to show that there are two types
of electric charge.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) The teacher uses a Van de Graaff generator to give another student a negative
charge.
Use ideas about electric charge to explain why the student’s hair stands on end.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 5 = 9 marks)
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6 Astra is a communication satellite in orbit around the Earth.
(Courtesy of NASA)
(a) The satellite sends a digital signal.
State two advantages of sending a digital signal instead of an analogue signal.
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
2 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(b) The signal is sent using microwaves. Microwaves are transverse waves.
Describe the difference between transverse waves and longitudinal waves.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
Edexcel Certificate in Physics
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57
(c) Astra’s orbital speed is 3054 m/s and the radius of its orbit is 42000 km.
(i) Calculate the time it takes for Astra to orbit the Earth once.
State an appropriate unit.
(3)
time = ............................................................................................ . . . . . . . . . . . . . . . . .
(ii) Use your answer to (i) to suggest why Astra follows this particular orbit.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 6 = 10 marks)
58
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7 The diagram shows a step-down transformer.
230 V
V
600 turns
6 turns
(a) On the diagram, label the primary coil and the secondary coil.
(1)
(b) (i)
State the equation linking the numbers of turns on each coil and the voltages
across each coil.
(1)
(ii) Calculate the voltage across the secondary coil.
(2)
Secondary voltage = ......................................................................... V
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
59
(c) Step-up transformers are used at power stations to provide high voltages for
electricity transmission.
Explain the advantage of transmitting electrical energy using high voltage cables.
(5)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 7 = 9 marks)
TOTAL FOR PAPER = 60 MARKS
60
Edexcel Certificate in Physics
SAMs
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Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
61
80 (%)
A description which includes some of the following:
(c)
(d)
Disadvantages:
x non-renewable/running out
x specific pollutant (e.g. CO2, SO2)
x correct consequence of specific pollutant (e.g. global warming,
acid rain)
Advantages:
x large amount of energy produced
x reliable source
x existing infrastructure/cost-effective
coal / oil / gas
wind / solar / tidal
Answer
(b)
1 (a)
Question
number
Paper 2P
Sample Mark Scheme
IGNORE ‘pollution’ unless qualified
max 3 marks for each of advantages
or disadvantages
If more than one answer given, all
must be correct to score mark
If more than one answer given, all
must be correct to score mark
Notes
Total: 8
max 5
1
1
1
Marks
62
Edexcel Certificate in Physics
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© Edexcel Limited 2011
(changing these variables) could also affect the time taken (for the
ice to melt)
(ii)
(c)
(ii)
A description including any three from:
x (close-packed) regular arrangement in ice
x (particles) vibrating in (fixed) position in ice
x increase in kinetic energy
x (close-packed) irregular arrangement in water
x (particles in) random motion in water
Any two from:
x ignore the anomalous result
x repeat the experiment / take a further reading for plastic
x then recalculate the average
to make it more reliable / to spot anomalous results
Any two from:
x area of material
x thickness of material
x amount / mass of ice
x surface area of ice
x starting temperature of ice
x room temperature
Answer
(i)
(b) (i)
2 (a)
Question
number
ACCEPT clear evidence from
diagrams given in support of written
answer
NOT “to calculate an average”
ACCEPT control (to make it a fair
test)
NOT just “fair test” unqualified
Notes
Total: 9
max 3
max 2
1
1
max 2
Marks
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
63
An explanation linking any three from:
x (seat belts) increase the time it takes (driver) to stop
x (and) momentum change in the stop is fixed
x reference to force = change in momentum/time
x so the force is reduced
x (and) smaller forces lead to less severe injuries
Any two suggestions from:
x need evidence from before and after law was in force
x need to collect large quantity of data
x cannot be sure that conditions remained the same
x there are many types of other road users
(b)
Answer
3 (a)
Question
number
NB answer must refer to momentum
to score 3
Notes
Total: 5
max 2
max 3
Marks
64
Edexcel Certificate in Physics
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© Edexcel Limited 2011
(b)
4 (a)
(ii)
1
)
n
(n = 1.49)
calculation
1
)
0.6991
(n =
rearrangement
substitution / correct equation
(0.6991 =
angles are equal /same
(iii)
critical (angle)
A description including:
x mark position of rays and block (on paper)
x use a protractor (or similar) to measure angles
x tabulated results
(ii)
(i)
angle of incidence labelled
angle of reflection labelled
Answer
(i)
Question
number
IF any unit given, remove 1 mark
ACCEPT substitution and
rearrangement in either order
i=r
i
r
Notes
Total: 10
3
1
1
3
2
Marks
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
65
(b)
5 (a)
A description including:
x charge different materials/plastics/rods
x ‘suspend’ one rod (on thread/on watch glass etc)
x bring (ends of) rods together/close
x looking for attraction and repulsion to indicate two types of
charge
OR
x charge electroscope (with known charge)
x charge different materials/plastics/rods
x bring the rods to the electroscope
x looking for leaf rising and falling to indicate two types of
charge
(ii)
An explanation linking the following:
x movement of electrons (around the body)
x repel so spread out as much as possible
x force of repulsion enough to move hair
An explanation linking the following:
x transfer of electrons
x from cloth to rod
Answer
(i)
Question
number
Notes
Total: 9
3
4
2
Marks
66
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(c)
(b)
6 (a)
(ii)
(i)
Question
number
2Sr
v
2 x S x 42 000 000
3054
so always same direction in sky / eq
(therefore this is) geostationary orbit
86400s = 1 day
seconds / s
86400 / 86410 / 86409
T
T
longitudinal : vibration/oscillation is parallel to energy transfer
transverse : vibration/oscillation is at right angles/perpendicular to
energy transfer
Any two from:
x can be (easily) regenerated
x are less affected by noise
x can be (easily) encrypted / coded
x can (easily be made to) carry more information
Answer
unit (1)
answer (1)
rearrangement / substitution (1)
ALLOW 1 mark for correct matching
of both transverse to perpendicular
and longitudinal to parallel, if it is
unclear what parallel/right angles is
to
ACCEPT appropriate mention of
increasing frequency, extending
bandwidth or multiplexing in order
to carry more data
Notes
Total: 10
3
3
1
1
max 2
Marks
Edexcel Certificate in Physics
SAMs
© Edexcel Limited 2011
67
(c)
(b)
7 (a)
(ii)
(i)
Question
number
and any one of :
x idea of heating effect (anywhere appropriate)
x idea of power losses
x mention of an appropriate energy transfer
An explanation linking any four from:
x idea of lower transmission current
x relating raised voltage lowered current
x idea of voltage drop
x idea of efficiency (anywhere appropriate)
x idea of costing (environmental / economic / social)
x can transmit energy / electricity further
x can use thinner cables
2.3 (V)
Vs
Vp
rearrangement / value
=
230
600
=
Vs
6
Ns
Np
substitution
correct equation or variant of
coils labelled correctly
Answer
use / mention of P = IV (once)
e.g. the current heats the
cables
NB use / mention must always be in
appropriate context
x
Acceptable alternatives:
x the current is less
x use / mention of VP IP = VS IS
x use / mention of V = IR
x use / mention of efficiency =
input y output e.g. less
energy Æ less pollution
x mention of National Grid
x use / mention of P = IV (once)
Notes
Total: 9
max 5
2
1
1
Marks
Level 1/Level2 Certificate
Science (Double Award) (KSC0)
Sample Assessment Material
First examination June 2012
Contents
Paper 1B
Sample Assessment Material
Sample Mark Scheme
3
33
Paper 1C
Sample Assessment Material
Sample Mark Scheme
45
73
Paper 1P
Sample Assessment Material
Sample Mark Scheme
Edexcel Certificate in Double Award Science
85
115
SAMs
© Edexcel Limited 2011
1
General Marking Guidance
2
x
All candidates must receive the same treatment. Examiners must
mark the first candidate in exactly the same way as they mark the
last.
x
Mark schemes should be applied positively. Candidates must be
rewarded for what they have shown they can do rather than
penalised for omissions.
x
Examiners should mark according to the mark scheme not according
to their perception of where the grade boundaries may lie.
x
There is no ceiling on achievement. All marks on the mark scheme
should be used appropriately.
x
All the marks on the mark scheme are designed to be awarded.
Examiners should always award full marks if deserved, ie if the
answer matches the mark scheme. Examiners should also be
prepared to award zero marks if the candidate’s response is not
worthy of credit according to the mark scheme.
x
Where some judgement is required, mark schemes will provide the
principles by which marks will be awarded and exemplification may
be limited.
x
When examiners are in doubt regarding the application of the mark
scheme to a candidate’s response, the team leader must be
consulted.
x
Crossed out work should be marked UNLESS the candidate has
replaced it with an alternative response.
Edexcel Certificate in Double Award Science
SAMs
© Edexcel Limited 2011
Write your name here
Surname
Other names
Edexcel
Certificate
Centre Number
Candidate Number
Biology
Paper: 1B
Sample Assessment Material
Time: 2 hours
Paper Reference
KBI0/1B
You must have:
Ruler
Total Marks
Instructions
black ink or ball-point pen.
t Use
in the boxes at the top of this page with your name,
t Fill
centre number and candidate number.
all questions.
t Answer
the questions in the spaces provided
t Answer
– there may be more space than you need.
t Show all the steps in any calculations and state the units.
Information
total mark for this paper is 120.
t The
marks for each question are shown in brackets
t The
– use this as a guide as to how much time to spend on each question.
Advice
Read each question carefully before you start to answer it.
t Keep
on the time.
t Write anyoureyeanswers
and in good English.
t Try to answer everyneatly
t Check your answersquestion.
if you have time at the end.
t
Turn over
S41083A
©2011 Edexcel Limited.
*S41083A0129*
Edexcel Certificate in Double Award Science
SAMs
© Edexcel Limited 2011
3
Answer ALL questions.
1 Organisms can be classified into groups, depending on some of their features.
(a) Some scientists were working in the rainforest in Indonesia.
They found two organisms living in the water in a pond.
Organism A was visible by eye, had fins for swimming and a mouth for feeding.
Organism B was a single-celled organism. This cell had a nucleus but no chitin
cell wall.
animals
bacteria
fungi
plants
protoctists
viruses
Use a word from the box to complete each of the following sentences.
(i)
Organism A belongs to the group called .................................................................................................
(1)
(ii) Organism B belongs to the group called .................................................................................................
(1)
(b) Give three structural differences between plant cells and animal cells.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) Explain how fungi obtain their food.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 1 = 8 marks)
4
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2 The animal cell below has a diploid number of eight. The cell is dividing by mitosis.
A
B
C
(a) Name the parts labelled A, B and C.
(3)
A
. . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ . . . . . . . . . . . . . . . . . .
B
. . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................. . . . . . . . . . . . . . . . . .
C
. . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .................. .......................................................................................................................... . . . . . . . . . . . . . . . . . .
(b) A student wrote this passage describing mitosis. There are two mistakes.
The diploid number of this cell is 8. It will divide into
four daughter cells, each with a diploid number of 8.
Mitosis is a very important type of cell division for
growth, repair, cloning and sexual reproduction.
Identify the two mistakes in the passage.
(2)
1
. . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
2
. . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) What is the diploid number in a human body cell?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 2 = 6 marks)
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3 A student carried out an investigation to find out how temperature affects movement
in beetles. The student placed a beetle in a plastic dish, which was allowed to float on
water in a water bath. The water bath was set at a temperature of 15qC.
The apparatus the student used is shown in the diagram below.
sheet of glass
plastic dish
beetle
water bath
water
The student wanted to measure the distance moved in cm by the beetle in one
minute. To do this, the student looked down from the top and recorded the
movement of the beetle on the sheet of glass using a pen. The student did this four
times (trials).
The whole procedure was carried out at five different temperatures using the same
beetle.
The diagrams show the pen recordings for the beetle’s movement during one minute
at 25qC.
6
Trial 1
Trial 2
Trial 3
Trial 4
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(a) Table 1 shows the results obtained for all trials at 15 qC, 20 qC, 30 qC and 35 qC.
(i)
Measure the distance moved in cm by the beetle during trial 4 at 25 qC.
Write your answer in the empty box in Table 1.
(1)
Table 1
Distance moved in cm in one minute
Temperature
in qC
Trial 1
Trial 2
Trial 3
Trial 4
15
2.4
2.1
1.8
1.7
20
4.3
4.1
4.4
4.0
25
6.2
6.0
6.0
30
7.0
6.7
6.9
6.6
35
8.3
8.4
8.1
8.0
(ii) Calculate the average distance moved in cm by the beetle at 35qC.
Show your working.
(2)
Answer ..................................................................... cm
(b) Describe and explain the results shown in the table.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) (i) Suggest how you could adapt this apparatus to obtain results at a
temperature of 5qC.
(1)
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Suggest one reason why the student should not collect results above 35 qC.
(1)
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(d) Suggest one way in which the student could modify the investigation to improve
the accuracy of the results.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 3 = 8 marks)
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4 Many endurance athletes train at high altitude (height above sea level) before a major
sporting event. They do this because they think that training at high altitude changes
the number of red blood cells in their body.
Describe an investigation to find out if training at high altitude does change the
number of red blood cells in the human body.
(6)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 4 = 6 marks)
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5 The diagram shows a food web from a grassland ecosystem.
Hawk
Sparrow
Rabbit
Snake
Spider
Toad
Mouse
Grasshopper
Praying mantis
Grass
(a) From the food web, name an organism that is
(i)
a producer
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) a primary consumer
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iii) a tertiary consumer
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) How many different organisms feed on the grasshopper in the food web?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) From the food web, draw a food chain that contains 5 levels and includes the
spider.
(2)
(d) A land owner wanted to reduce the number of rabbits feeding on his grass, so he
killed a large number of rabbits.
Suggest an explanation for the effect this would have on the hawk population.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 5 = 8 marks)
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6 As part of an investigation into biological cycles, Ome buried a dead mouse in some
soil outside her classroom.
Explain what would happen to the body of the mouse over the next six months.
(5)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 6 = 5 marks)
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7 The kidney contains many nephrons and is involved in excretion.
(a) Ultrafiltration occurs at the glomerulus. Describe how the blood leaving the
glomerulus will differ from blood entering the glomerulus.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) In part of the nephron, selective reabsorption occurs.
What is meant by the term selective reabsorption?
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) The following passage describes part of the role of the kidney. Complete the
sentences in the passage by writing a suitable word or words on each dotted line.
(5)
The amount of water returning to the blood is controlled by the hormone
............................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
which is released from the .............................................................................. gland.
The solution containing waste products from the kidney is called
............................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
and passes down a tube called the ............................................................... . . . . . . . . . . . . . . .
It is stored in the . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............................. before being passed from the body down
the urethra.
(Total for Question 7 = 10 marks)
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13
8 A student investigated how much gas was given off under different conditions in the
production of beer. The diagram shows the apparatus she used.
Test tubes A and B each contained the same volume of yeast mixed with glucose solution.
Test tube C contained yeast in water, but no glucose.
Test tube D contained glucose solution, but no yeast.
Test tube A was placed in room temperature at 20qC. The other test tubes were
placed in a warm water bath at 35qC. A balloon was put over the opening of each
tube.
balloon
A
B
C
D
water at 35qC
yeast and
glucose solution
yeast
in water
glucose
(no yeast)
The table describes the appearance of the balloons after 15 minutes.
Some inflate (fill up with gas), others do not.
Tube
Appearance of balloon
after 15 minutes
A
slightly inflated
B
very inflated
C
no change
D
14
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(a) (i)
Explain why the balloons on tubes A and B inflated.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Explain why being in a higher temperature caused the balloon on tube B to
inflate more than the balloon on tube A.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Why did the balloon on tube C not show any change?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) Describe the appearance you would expect the balloon on tube D to have at the
end of the experiment.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 8 = 6 marks)
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15
9 Lipase is an enzyme that breaks down lipids (fats) to fatty acids and glycerol. Lipase is
produced in the pancreas and acts in the small intestine.
(a) On the diagram, label the pancreas and the small intestine.
(2)
16
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(b) The graph shows the relative amount of lipid broken down by lipase under
different conditions.
Relative amount
of lipid broken
down in a
minute
Lipase in
acidic solution
(i)
Lipase in
alkaline solution
Lipase and
bile
Describe and explain the results shown by the graph.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Name the three chemical elements present in lipids.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) Describe how the structure of the small intestine is adapted for the efficient
absorption of the products of digestion.
(5)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 9 = 12 marks)
18
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10 Nicola investigated the digestion of lactose, a substance found in milk.
The diagram shows the apparatus she used.
milk
containing
lactose
beads
clamp
milk containing
glucose
beaker
The beads contained an enzyme called lactase. This enzyme digests lactose into two
sugars called glucose and galactose.
The outer coat of the beads allows milk to enter and sugars to leave. The outer coat
also prevents the enzyme from leaving.
An experiment was carried out in which milk was allowed to flow through the
apparatus at different speeds. The speed of flow was changed using the clamp on the
exit tube.
The milk collected in the beaker was tested for the concentration of glucose it
contained at each flow speed. The graph shows the results.
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19
160
140
Glucose concentration in mmol per litre
120
100
80
60
40
20
0
0
10
20
30
40
Speed of milk flow in cm3 per minute
20
Speed of milk flow through
apparatus in cm3 per minute
Glucose concentration in beaker
milk in mmol per litre
4
156
6
132
10
100
18
55
32
25
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(a) (i)
Describe the relationship between the speed of flow and the concentration of
glucose.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Suggest an explanation for the relationship between the speed of flow and
the concentration of glucose.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) The investigation was carried out at 20 qC.
(i)
Name two variables, apart from temperature, that need to be kept the same
during this investigation.
(2)
1
. . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ . . . . . . . . . . . . . . . . . .
2
. . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ . . . . . . . . . . . . . . . . .
(ii) Suggest how the results would be different if the investigations had been
carried out at 25 qC.
Explain your answer.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) How would the concentration of glucose in the beaker be different if the beads
used were bigger in size?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(d) Give one way in which the results in this investigation could be made more
reliable.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 10 = 9 marks)
22
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11 Angela carried out an experiment to investigate how breathing rate changes during
exercise.
She worked with a partner who counted the number of breaths she took during
Ɣ
three periods of 20 seconds at rest
Ɣ
three periods of 20 seconds immediately after 5 minutes of exercise
Ɣ
three periods of 20 seconds immediately after 10 minutes of exercise.
The results that Angela collected from her experiment are given in the table.
Situation when
breaths counted
At rest
After 5 minutes
of exercise
After 10 minutes
of exercise
Number of
breaths
in 20 seconds
1st period
Number of
breaths
in 20 seconds
2nd period
Number of
breaths
in 20 seconds
3rd period
Average
breathing rate
in breaths per
minute
5
6
5
16
15
16
14
45
18
20
18
56
(a) Give two variables that Angela should have controlled in her experiment. For
each variable describe how she could control it.
(4)
Variable 1 .................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....................................... ...................................................................................................... . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
Variable 2
................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................ .................................................................................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) (i)
State how Angela’s breathing rate changed with exercise.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
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(ii) Explain why Angela’s breathing rate changed during exercise.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 11 = 9 marks)
24
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12 The oil seed plant is an important crop plant grown by farmers.
(a) The stages below are used to insert a gene for herbicide resistance into crops such
as oil seed plant.
Place the stages in the correct order by writing the order (1, 2, 3, 4 and 5) in the
table.
(4)
Stage
Order
Recombinant DNA inserted into the crop plant cell
using a vector.
Desired gene for herbicide resistance inserted into recipient
DNA using an enzyme.
Desired gene for herbicide resistance removed from
donor cell using an enzyme.
The plant is herbicide resistant.
Desired gene for herbicide resistance identified.
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(b) Give one example of a vector used in genetic modification.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) State the role of restriction enzymes and ligase enzymes in genetic modification.
(2)
restriction enzymes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................................................................. .......................................................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
ligase enzymes ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...................................................... ...................................................................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) (i)
What is meant by the term herbicide?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Give a reason why a farmer would want his crop plants to be resistant to a
herbicide.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(e) Suggest why some people are concerned about genetically modified (GM) crops.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 12 = 11 marks)
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13 The table shows data taken from dairy farms in the UK. It shows changes in milk yield
and dairy herd size (number of cows) between the years 2000 and 2008.
Year
Average milk yield
in dm3 per cow
per year
Average size of
dairy herd
in thousands
2000
6,048
2,330
2001
6,449
2,229
2002
6,450
2,224
2003
6,631
2,185
2004
6,886
2,060
2005
6,999
2,003
2006
6,963
1,989
2007
6,924
1,961
2008
6,945
1,902
(a) On the grid, plot the data to show how average milk yield changed during the
years 2000 to 2008. Join your points using straight lines.
(5)
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(b) Describe how the average milk yield per cow changes over the time period.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) Suggest why the average size of dairy herds changed between 2000 and 2008.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) Describe how a selective breeding programme could be used to produce an
improvement in milk yield.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
28
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(e) Improvement in milk yield can be affected by factors other than selective
breeding.
Suggest two factors that a farmer may change that could lead to an improvement
in milk yield. For each factor, give a reason why it would improve milk yield.
(4)
Factor 1
....................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................................... ......................................................................................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
Reason
......................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
Factor 2
....................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................................... ......................................................................................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
Reason
......................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 13 = 15 marks)
Edexcel Certificate in Double Award Science
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29
14 Batten’s disease is caused by a recessive allele. Symptoms include loss of vision,
epilepsy and difficulty in walking and talking.
The mutation causes lipofuscins to build-up in the body’s tissues. Lipofuscins consist
of fats and proteins and form distinctive deposits that cause the symptoms.
(a) Name one system in the body affected by Batten’s disease.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Two adults who had never shown any symptoms married and had a child who
developed Batten’s disease.
Deduce the genotypes of the parents and show how the gametes formed by these
parents can give rise to a child who has the genotype and phenotype for Batten’s
disease.
Use B to show the normal allele and b to show the recessive allele responsible for
Batten’s disease.
(4)
30
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(c) Recessive conditions, like Batten’s disease, are usually very rare in populations.
However, if someone who comes from a family with a history of the disease
marries a cousin then the likelihood of inheriting the condition changes.
Suggest why this is the case.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 14 = 7 marks)
TOTAL FOR PAPER = 120 MARKS
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32
Edexcel Certificate in Double Award Science
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33
An explanation linking three of the following points:
x mycelium / hyphae
x feed on dead material / saprophytic
x secrete extracellular enzymes onto food / eq
x which breaks it down / digest
x so that breakdown products can be absorbed by fungus
(c)
protoctists
(i)
Any three of the following statements about plant cells:
x plant cells have a (cellulose) cell wall
x plants cells contain chloroplasts
x plant cells store carbohydrate as starch (or sucrose)
x plant cells contain a vacuole
animals
(i)
Answer
(b)
1 (a)
Question
number
Paper 1B
Sample Mark Scheme
ACCEPT converse statements about
the animal cell
ACCEPT fish
Notes
Total: 8
3
3
1
1
Marks
34
Edexcel Certificate in Double Award Science
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any modification that forces movement in a straight line
cruel / unethical / cause harm / kill beetle / eq
IGNORE denatured
(ii)
(d)
ice
(i)
(c)
(8.3 + 8.4 + 8.1 + 8.0) ÷ 4
= 8.2
(ii)
increase in temperature leads to an increase in distance moved
enzymes work better / more energy / more respiration
5.8
(i)
(b)
3 (a)
Answer
46
(c)
Question
number
not four cells / two daughter cells
not sexual / asexual
A = cytoplasm
B = chromosome / DNA
C = cell membrane
Answer
(b)
2 (a)
Question
number
ACCEPT beetle moves too quickly to
trace its path accurately
IGNORE fridge
ALLOW 1 in working for division by 4
ALLOW ±1 mm
Notes
ACCEPT either a correction or an
identification of a wrong statement
Notes
Total: 8
1
1
1
2
2
1
Marks
Total: 6
1
2
3
Marks
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35
5
grass --> grasshopper --> spider --> snake --> hawk
OR
grass --> grasshopper --> spider --> sparrow --> hawk
An explanation linking the following points:
x hawk numbers decrease / drop / go down
x (because) less food / rabbits for them to eat
(c)
(d)
grass
rabbit/grasshopper
hawk/snake/sparrow
Answer
C : two or more altitudes
O : same person / people / gender / age
R : repeat at each altitude / several samples
M1 : count (number of red blood cells)
M2 : use microscope
S1 : same diet
S2 : other controlled variable eg training intensity
Answer
(b)
(i)
(ii)
(iii)
Question
number
5 (a)
4
Question
number
ACCEPT could stay the same,
as hawks eat more of other (named)
prey instead
1 mark for 5 organisms including
spider
1 mark for correct arrows
Notes
Notes
Total: 8
2
2
1
1
1
1
Marks
Total: 6
6 max
Marks
36
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6
Question
number
An explanation linking five of the following:
x bacteria / fungi / decomposers / a named example
x digest / break down
x body tissue / proteins / compounds / eq
x (because they contain) enzymes
x (leading to) loss of mass / dead mouse getting smaller / decays
x release of carbon dioxide / water
x release of mineral ions / named mineral ion
x ref to speed depending on environmental temperature / season
Answer
ACCEPT reference to
insects/invertebrates/scavenger
Notes
Total: 5
5
Marks
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37
Answer
some substances / eq
absorbed/eq into the blood
ADH
pituitary
urine
ureter
bladder
(c)
A description including three of the following:
x less glucose
x less water
x fewer amino acids
x less urea
x fewer ions
(b)
7 (a)
Question
number
ACCEPT converse arguments for
blood entering the glomerulus
Notes
Total: 10
5
2
3
Marks
38
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no change / same as C / does not inflate
(c)
An explanation linking the following points:
x increased enzyme/yeast activity / eq
x increased chemical reactions / kinetic energy / eq
(ii)
no glucose / eq
An explanation linking the following points:
x respiration (of the yeast)
x (produces) carbon dioxide (gas)
(i)
Answer
(b)
8 (a)
Question
number
IGNORE no respiration
ACCEPT no gas/carbon dioxide
produced
ACCEPT warmer gas takes up larger
volume
Notes
Total: 6
1
1
2
2
Marks
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39
(c)
(b)
9 (a)
carbon, hydrogen and oxygen
(ii)
A description including five of the following:
x villi
x microvilli
x (have a) large surface area
x (and have) thin walls / epithelium
x (rich) capillary network
x (to allow maximum rate of) diffusion
x to carry away molecules / maintain gradient
x (into) lacteals
x named product of digestion
An explanation linking four of the following points:
x lipase works best with bile
x (and works) least well in acidic / better in alkaline
x bile is alkaline / neutralises (stomach acid) / optimum pH /eq
x bile emulsifies lipid
x (therefore) larger surface area (for lipase)
both correctly labelled
Answer
(i)
Question
number
Allow C, H, O
Notes
Total :12
5 max
1
4 max
2
Marks
40
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10
more experiments / eq
(d)
An explanation linking two of the following:
x more glucose / more digestion
x (because) faster enzyme activity / optimum temperature
x (and) higher kinetic energy / more collisions / eq
(ii)
lower / less glucose
Any two from:
x concentration of enzyme/lactase
x type of milk
x size of beads
x number of beads
An explanation linking the following:
x if speed of flow high, then less time in bead
x (so less time) to digest / in contact with enzyme/lactase
(ii)
(i)
faster flow, lower glucose concentration / less glucose
Answer
(i)
(c)
(b)
(a)
Question
number
ACCEPT
less glucose
milk flows faster (at a higher temp)
less time in contact with enzyme
ACCEPT converse argument
Notes
Total: 9
1
1
2 max
2 max
2
1
Marks
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41
11
(b)
(a)
increases
An explanation linking four of the following:
x muscles
x (need) more oxygen
x (because of) increased respiration
x (to provide) more energy
x (increase breathing also) removes more CO2
x (as) waste product of respiration
(ii)
temperature of room
(controlled by) using thermostat / air conditioning
amount of exercise / type of exercise
(controlled by having) same number of exercise type
Answer
(i)
Question
number
ACCEPT ref to heat
ACCEPT other reasonable controls
Notes
Total: 9
max 4
1
4
Marks
42
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12
(e)
(d)
restriction enzyme: to cut DNA / chop DNA
(c)
to spray / kill weeds without killing crop
(ii)
Any two from:
x crops could alter food chains/webs
x lack of control on gene transfer
x GM crops could take over ecosystems
x might be effects on health
(substance that) kills plants
(i)
ligase enzymes: to join / stick DNA
virus / plasmid / gene gun
Stage
Recombinant DNA inserted into the crop plant
cell using a vector
Desired gene for herbicide resistance inserted
into recipient DNA using an enzyme
Desired gene for herbicide resistance removed
from donor cell using an enzyme
The plant is herbicide resistant
Desired gene for herbicide resistance identified
Answer
(b)
(a)
Question
number
5
1
2
3
Order
4
ACCEPT
gene gets into wild plants/weeds
(so) weeds now resistant to herbicide
/ herbicide now non-functional
1 mark for 1st statement correct
1 mark for last statement correct
1 marks for statement 2 before
statement 3
1 mark for statement 3 before
statement 4
Accept
Total: 11
max 2
1
1
2
1
4
Marks
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43
13
A description that includes the following:
x increases
x up to 2005 / then levels off / plateaus
each cow producing more milk, so fewer cows needed / total yield for
the herd stays constant / less demand from consumers for milk
A description that includes three of:
x select bulls
x that produce female calves with high milk yield / eq
x choose high milk-yielding cows
x and then repeat with offspring
Any two from:
nutrition / eq
greater fat/lipid in diet to increase milk yield / eq
(b)
(c)
(d)
(e)
sex hormones
larger udders to increase milk production
keep indoors
(so) more energy available for milk production
size suitable ;
line joining points ;
axes correct way round and labelled ;
points correctly plotted ;;
Answer
(a)
Question
number
ALLOW any other suitable answers
ACCEPT due to diversification
ACCEPT by 897 dm3 per cow
Note: 2 marks for points, penalise 1
mark for each incorrect plot
Accept
Total: 15
4
max 3
1
2
5
Marks
44
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14
(c)
parents: Bb
(b)
(BB
Bb
b
bb
b
(therefore) increased chance of these combining / reference to
inbreeding
cousin may (also) carry recessive allele / they share a common
ancestor
normal normal) affected
Bb)
B
Answer
Bb
phenotype of children: (normal
genotype of children:
gametes of parents: B
nervous system
(a)
Question
number
ALLOW only bb shown as Batten’s
phenotype
ALLOW Bb appearing once
ACCEPT skeletal system
Notes
Total: 7
2
4
1
Marks
Write your name here
Surname
Other names
Edexcel
Certificate
Centre Number
Candidate Number
Chemistry
Paper: 1C
Sample Assessment Material
Time: 2 hours
Paper Reference
KCH0/1C
You must have:
Ruler
Candidates may use a calculator.
Total Marks
Instructions
black ink or ball-point pen.
t Use
in the boxes at the top of this page with your name,
t Fill
centre number and candidate number.
all questions.
t Answer
the questions in the spaces provided
t Answer
– there may be more space than you need.
t Show all the steps in any calculations and state the units.
Information
total mark for this paper is 120.
t The
marks for each question are shown in brackets
t The
– use this as a guide as to how much time to spend on each question.
Advice
Read each question carefully before you start to answer it.
t Keep
on the time.
t Write anyoureyeanswers
and in good English.
t Try to answer everyneatly
t Check your answersquestion.
if you have time at the end.
t
Turn over
S41079A
©2011 Edexcel Limited.
*S41079A0128*
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46
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Answer ALL questions.
1 The table shows the properties of four substances.
Use the information in the table to answer the following questions.
Melting point
in °C
Boiling point
in °C
A
1650
B
Substance
Conducts electricity when
solid
liquid
2230
no
no
1538
2862
yes
yes
C
–7
59
no
no
D
801
1413
no
yes
Place a cross ( ) in the appropriate box to indicate your answer.
Choose from A to D a substance that could be:
(5)
(a) a metal
A
B
C
D
C
D
C
D
C
D
C
D
(b) a giant covalent structure
A
B
(c) an ionic compound
A
B
(d) a liquid at 25 °C
A
B
(e) a solid at 1600 °C
A
B
(Total for Question 1 = 5 marks)
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47
2 A student investigated what happened when a sample of wax was heated using a
Bunsen burner.
He set up the apparatus as shown in the diagram.
solid wax
HEAT
The student heated the solid wax strongly with a Bunsen burner until it turned into a
liquid.
(a) Give the name of the process that occurs when a solid turns into a liquid.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Explain one change needed to make the experiment safer.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) Describe the changes in arrangement, movement and energy of the particles
when the liquid wax cools to become a solid.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 2 = 6 marks)
48
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3 The diagram represents an atom of an element.
A
B
C
(a) The diagram shows that there are equal numbers of particles A and C.
(i)
State the name of each of the particles A and B.
(2)
A . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................. ........................................................................................................................... . . . . . . . . . . . . . . . . . .
B
. . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ........................................................................................................................... . . . . . . . . . . . . . . . . . .
(ii) State the atomic number and mass number of this atom.
(2)
Atomic number
Mass number
(b) (i)
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....................................................... .................................................................................... . . . . . . . . . . . . . . . . . .
......... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .................................................. .......................................................................................... . . . . . . . . . . . . . . . . . .
State the name of this element.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) State the electronic configuration of this element.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 3 = 6 marks)
Edexcel Certificate in Double Award Science
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49
4 A student wanted to find out how easily different metal carbonates decomposed on
heating.
She placed a sample of a metal carbonate into a test tube and heated it, passing the
gas given off through limewater using the apparatus shown in the diagram.
metal
carbonate
limewater
HEAT
She heated three other metal carbonates in turn and measured the time taken for the
limewater to turn milky.
Her results are given in the table.
Time taken
in seconds
Metal carbonate
50
copper(II) carbonate
5
magnesium carbonate
25
lead(II) carbonate
15
sodium carbonate
does not turn milky
Edexcel Certificate in Double Award Science
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(a) State the name of the gas that causes the limewater to turn milky.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Use the results to identify, with a reason, which metal carbonate decomposed
most easily.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) What do the results suggest about the effect of heat on sodium carbonate?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) State two things that the student must do to make sure the experiment is valid
(a fair test).
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
2 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(Total for Question 4 = 6 marks)
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5 Fractional distillation is an important process in the oil industry.
In this process, the crude oil is separated into a number of fractions. Each fraction is a
mixture of hydrocarbons.
The diagram shows the column used for fractional distillation.
heated
crude oil
(a) What is meant by the term hydrocarbon?
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Bitumen, diesel, gasoline and refinery gases are three of the fractions obtained
from crude oil.
(i)
Which one of these three fractions has the lowest boiling point?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Which one of these three fractions is the most viscous?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) Explain how the separation of crude oil into fractions takes place in the
fractionating column.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 5 = 8 marks)
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6 (a) Isomers are compounds that have the same molecular formula but different
displayed formulae.
The molecular formula C4H8 represents several isomers.
The displayed formulae and names for two of these isomers are
H
H
H
H
H H
C=C C
H
C=C
C H
H
H H
H
H
H
but-1-ene
(i)
C
C
H
H
methylpropene
Draw the displayed formula and give the name for another alkene with the
molecular formula C4H8
(2)
Name .........................................................................
(ii) The displayed formula of another isomer of C4H8 is
H
H
H
C
C
H
H
C
C
H
H
H
cyclobutane
The general formula of cyclobutane is also CnH2n
State why cyclobutane is not an alkene.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(iii) Cyclobutane can be distinguished from but-1-ene by adding bromine water
and shaking. Bromine water is orange.
State what you would see when bromine water is shaken separately with each
compound.
(2)
Observation with cyclobutane
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
Observation with but-1-ene
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Cracking is used to break long alkane molecules into shorter alkanes and alkenes.
Explain why this process is of such importance in the petrochemical industry.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) Cracking can be carried out in the laboratory by passing the vapour of an alkane
over a heated catalyst using the apparatus shown.
decane soaked into
mineral wool
catalyst
ethene
HEAT
liquid alkane
water
When decane (C10H22) is cracked, a shorter chain alkane and ethene (C2H4) can be
produced.
(i)
Write a chemical equation for the cracking of decane.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) The alkane produced can be used as a fuel for cars.
When this fuel is burned in a car engine, some incomplete combustion occurs.
This produces carbon monoxide, which is dangerous to humans.
Explain why carbon monoxide is dangerous to humans.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 6 = 11 marks)
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7 Copper chloride is a soluble ionic compound. Solid copper chloride is green.
(a) A crystal of copper chloride was placed in a beaker containing water. It was left
for several days.
copper chloride
crystal
water
Explain how the appearance of the liquid in the beaker changes after several days.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) A chemist electrolyses a sample of molten copper chloride, CuCl2.
+–
lamp
cathode
anode
molten copper chloride
Name the products formed at the electrodes.
(2)
Anode ............................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................. . . . . . . . . . . . . . . . . .
Cathode ...................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .................................... ........................................................................................................ . . . . . . . . . . . . . . . . . .
(c) Write an equation to show the formation of the product at the negative electrode.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 7 = 6 marks)
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8 Equal masses of iron, magnesium and zinc were placed in separate beakers, each
containing 50 cm3 of copper(II) sulfate solution.
The mass of copper displaced in each case was found and each experiment was
performed three times. The results obtained are given in the table.
Mass of copper produced in grams
Metal
Experiment 1
Experiment 2
Experiment 3
iron
1.1
1.3
1.2
magnesium
2.3
3.2
2.2
zinc
0.9
0.8
1.10
(a) How can you tell that one of the results has been recorded to a greater precision
than the others?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Write a chemical equation for the reaction taking place between magnesium and
copper(II) sulfate.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) (i)
State, in terms of electrons, what happens when a copper ion becomes a
copper atom.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) What name is given to the type of change occurring in (c)(i)?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iii) State two observations you would expect to make when magnesium is added
to copper(II) sulfate solution.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 8 = 7 marks)
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9 (a) An aqueous solution of hydrogen peroxide (H2O2) decomposes very slowly into
water (H2O) and oxygen (O2) according to the following equation:
2H2O2(aq) → 2H2O(l) + O2(g)
The reaction is faster when manganese(IV) oxide (MnO2) is added. The
manganese(IV) oxide remains chemically unchanged at the end of the reaction.
A student investigated the reaction in the presence of manganese(IV) oxide. He
collected the oxygen gas produced and recorded its volume every five minutes.
His results are shown in the table.
(i)
Time
in minutes
0
5
10
15
20
25
30
35
40
Volume
in cm3
0
20
32
42
50
55
58
60
60
The volume of gas given off between 5 and 10 minutes is 12 cm3.
Calculate the volume of gas given off between 30 and 35 minutes.
(1)
Answer ......................................................................... cm3
(ii) Explain, in terms of the changes in the rate of the reaction and collisions
between particles, why your calculated volume is less than 12 cm3.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . .
(iii) After how many minutes did the reaction finish?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(b) What type of substance is manganese(IV) oxide in this experiment?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
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(c) Some of the graphs A to F below could represent changes occuring during the
decomposition of hydrogen peroxide.
A
B
Mass
Mass
0
0
Time
C
D
Mass
Mass
0
0
Time
E
Time
F
Mass
Mass
0
60
Time
0
Time
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Answer the questions below by placing a cross ( ) in the appropriate box to
indicate your answer.
Which graph could represent
(i)
the total mass of oxygen given off as the experiment in (a) proceeds?
(1)
A
B
C
D
E
F
(ii) the mass of hydrogen peroxide remaining as the experiment in (a) proceeds?
(1)
A
B
C
D
E
F
(iii) the mass of the manganese(IV) oxide as the experiment in (a) proceeds?
(1)
A
B
C
D
E
F
(Total for Question 9 = 9 marks)
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10 When potassium iodide solution is mixed with lead(II) nitrate solution, a reaction
occurs to form the insoluble salt, lead(II) iodide.
The equation for this reaction is:
2KI(aq) + Pb(NO3)2(aq) o PbI2(s) + 2KNO3(aq)
A student carried out an investigation to find how much precipitate was formed with
different volumes of lead(II) nitrate solution.
x He used a measuring cylinder to transfer 15 cm3 of potassium iodide solution into
a clean boiling tube.
x Using a different measuring cylinder, he measured out 2 cm3 of lead(II) nitrate
solution and added this to the potassium iodide solution in the boiling tube.
x A yellow precipitate formed in the tube and was allowed to settle.
x The student then measured the height (in cm) of the precipitate using a ruler.
He repeated the experiment using different volumes of lead(II) nitrate solution.
In each experiment, the potassium iodide solution and lead(II) nitrate solution he
used were of the same concentration.
The graph shows the results he obtained.
Height of precipitate in cm
4
3
2
1
0
0
2
4
6
8
10
12
14
16
Volume of lead(II) nitrate solution added in cm3
(a) Explain why the line on the graph rises to a maximum level, but then does not
change.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) (i)
On the graph, circle the point which seems to be anomalous.
(1)
(ii) Explain two things that the student may have done in the experiment to give
this anomalous result.
(4)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
2 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(c) The diagram shows a result of an identical experiment.
8
solution of
soluble salts
7
6
5
4
3
precipitate of
solid lead(II) iodide
2
1
(i)
How much precipitate has been made in the tube?
(1)
cm
................................................................
(ii) Use the graph to find the voume of lead(II) nitrate solution needed to make
this amount of precipitate.
(1)
................................................................
cm3
(Total for Question 10 = 9 marks)
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63
11 Fluorine and chlorine are two elements in Group 7 of the Periodic Table.
Fluorine reacts with most elements in the Periodic Table, but it does not react with
neon.
Neon is in Group 0 of the Periodic Table.
(a) Explain, in terms of the arrangement of electrons in its atoms, why neon is very
unreactive.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) The diagram on the left shows the arrangement of the electrons in a fluorine
atom.
Use the Periodic Table to help you to complete the diagram on the right to show
the arrangement of electrons in a chlorine atom.
(2)
F
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(c) When chlorine gas is bubbled into an aqueous solution of potassium iodide, the
colourless solution turns brown.
(i)
Complete the following ionic equation for the reaction that takes place.
(2)
Cl2(g) + . . . . . . . . . . . . . I−(aq) →
. . . . . . . . . ....................
(aq) +
.............................
(aq)
(ii) What is the name given to this type of reaction?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iii) Why does the solution turn brown?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) When chlorine reacts with concentrated sodium hydroxide solution, a compound
is formed that contains 21.6% by mass of sodium and 33.3% by mass of chlorine.
The rest is oxygen.
Calculate the empirical formula of this compound.
(4)
. . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 11 = 12 marks)
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65
12 Hydrogen can be prepared in the laboratory by reacting zinc with dilute sulfuric acid
using the apparatus shown.
dilute
sulfuric acid
hydrogen
water
zinc
The equation for the reaction is:
Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)
The reaction is fairly slow but, when copper(II) sulfate solution is added, bubbles of
hydrogen form much more quickly.
A student decided to investigate how copper(II) sulfate solution increased the rate of
this reaction.
She set up the apparatus as shown, without copper(II) sulfate present, and counted
the number of bubbles of hydrogen produced every 15 seconds.
She then repeated the experiment with copper(II) sulfate present.
(a) Explain why her method of counting the number of bubbles of hydrogen might
not give accurate results in her second experiment, with copper(II) sulfate present.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) Describe how she should change the experiment to allow the collection of more
precise results.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
The student then decided that she wanted to show that the gas collected was
hydrogen. She burned a sample in oxygen and collected the colourless liquid that
formed on cooling. If the gas were hydrogen then the colourless liquid should be
pure water.
(c) Describe a physical test that she could perform to show that the colourless liquid
is pure water.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
The student’s teacher said that even if the colourless liquid were pure water then it
does not necessarily mean that the gas was hydrogen.
(d) Suggest the name of another gas that produces water when it is burned in
oxygen.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 12 = 7 marks)
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67
13 Ammonia (NH3) is manufactured in the exothermic reaction between nitrogen gas (N2)
and hydrogen gas (H2) in the presence of an iron catalyst.
N2(g) + 3H2(g) `
_ 2NH3(g)
ΔH = –92 kJ/mol
The nitrogen and hydrogen mixture is passed into a reaction chamber at a pressure of
200 atmospheres and a temperature of 450qC.
The reaction is reversible and, if left for long enough, can reach a position of dynamic
equilibrium.
(a) Why is a catalyst needed in this reaction?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) What is meant by the term dynamic equilibrium?
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) A scientist working in the factory making ammonia suggested changing the
reaction conditions to a pressure of 1000 atmospheres and a temperature of
250qC.
Use your knowledge of equilibrium reactions and reaction rates to explain
whether the scientist’s suggestion was a good one.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(d) The mixture of gases leaving the reaction chamber contains unreacted nitrogen
and hydrogen as well as ammonia.
(i) Explain how the ammonia can be separated from the unreacted nitrogen and
hydrogen after the mixture has left the reaction chamber.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) What happens to the unreacted nitrogen and hydrogen after it has been
separated from the ammonia?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(e) Ammonia is used to make the fertiliser ammonium nitrate (NH4NO3) by reacting
ammonia with nitric acid.
Write a chemical equation for the reaction between ammonia and nitric acid.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(f ) Describe a chemical test that you could perform to show that ammonium nitrate
contains ammonium ions.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 13 = 14 marks)
Edexcel Certificate in Double Award Science
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69
14 Zinc phosphide (Zn3P2) is found in some rat poisons. It is an ionic compound
manufactured by heating zinc and phosphorus together.
(a) (i)
The formula of the zinc ion is Zn2+.
Deduce the formula of the phosphide ion.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) Explain why zinc phosphide does not conduct electricity when solid, but
does when molten.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(b) Calculate the relative formula mass (Mr) of zinc phosphide.
(2)
Relative formula mass = .........................................................................
70
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(c) A bag containing 51.4 kg (51400 g) of zinc phosphide stored in a factory
warehouse was accidentally contaminated with water.
Zinc phosphide reacts with water to form zinc hydroxide and phosphine gas, PH3.
The equation for the reaction is:
Zn3P2(s) + 6H2O(l) → 3Zn(OH)2(s) + 2PH3(g)
(i)
Calculate the minimum mass of water, in kg, needed to react with all of the
zinc phosphide in the bag.
(3)
Mass of water needed = ......................................................................... kg
(ii) The factory was evacuated because phosphine can burst into flames
immediately when it comes into contact with oxygen in the air.
What does this suggest about the activation energy for the reaction between
phosphine and oxygen?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(iii) Is the reaction between phosphine and oxygen endothermic or exothermic?
Use information from part (ii) to justify your answer.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
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71
(d) (i)
Phosphine is similar to ammonia (NH3) in the way its atoms are bonded.
Draw a dot and cross diagram to show the arrangement of electrons in a
molecule of phosphine. You should show only the outer electrons of each
atom.
(2)
(ii) Explain why phosphine has a low boiling point.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 14 = 14 marks)
TOTAL FOR PAPER = 120 MARKS
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73
D
C
A
(c)
(d)
(e)
An explanation linking the following :
x heat with electric heater / in water bath / sand bath
x because wax may catch fire / prevent liquid wax boiling over
or spitting
A description including the following:
x (becomes) regular arrangement / pattern (of particles)
x particles slow down / vibrate (in fixed positions)
x particles lose (kinetic) energy
(c)
Answer
Answer
(b)
2 (a)
melting
A
(b)
Question
number
B
1 (a)
Question
number
Paper 1C
Sample Mark Scheme
ACCEPT stop moving around (freely)
ACCEPT closer together
ACCEPT
x use test tube holder / clamp
x to prevent being burned by hot
test tube
Notes
Notes
Total: 6
3
2
1
Marks
Total: 5
1
1
1
1
1
Marks
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(b)
3 (a)
boron
2, 3
(ii)
mass number = 11
atomic number = 5
B = neutron(s)
A = proton(s)
(i)
(ii)
(i)
Question
number
Answer
ACCEPT any other punctuation marks,
such as ‘.’ ‘/’ ‘-‘ or no punctuation
No mark for two numbers transposed
Award 1 mark for two correct
particles in the wrong order
Notes
Total: 6
1
1
2
2
Marks
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75
ACCEPT:
x same amount of limewater
x same temperature / Bunsen
setting
x same mass of solid
Any two from:
x same volume / concentration of limewater
x same flame e.g. “always roaring flame”
x same amount of solid
x same distance of flame to tube
x same form / state of division of solid e.g. “all powders”
(d)
Total: 6
max 2
1
ALLOW no carbon dioxide / gas given
off
(sodium carbonate / it) does not decompose
1
Marks
(c)
ALLOW CO2
Notes
2
copper(II) / copper (carbonate)
carbon dioxide
Answer
(because) limewater turned milky in least time / most quickly
(b)
4 (a)
Question
number
76
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(c)
(b)
5 (a)
Answer
bitumen
(ii)
An explanation linking any four of the following:
x crude oil / vapour rises through the (fractionating) column
x idea of temperature gradient in column e.g. hotter at the
bottom than the top
x different fractions have different boiling point
x condense when they get to part of the column that has lower
temperature than their boiling point
x vapour passes through bubble caps / one-way valves OR idea
that liquid fractions cannot trickle back down because of
bubble caps
refinery gases
only
compounds / substances containing hydrogen and carbon
(i)
Question
number
ALLOW vaporising point / condensing
temperature
DO NOT ACCEPT atoms/elements in
place of compounds/substances
Notes
Total: 8
max 4
1
1
2
Marks
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77
(ii)
C10H22 ń C8H18 + C2H4
(c)
An explanation linking the following points:
x toxic / poisonous
x (because) it restricts blood carrying oxygen
1 mark for correct formula for alkane
1 mark for balanced equation
An explanation linking the following points:
x crude oil contains too many long chain hydrocarbons
x which are economically less useful / need converting to more
economically useful smaller hydrocarbons
(i)
cyclobutane: no change / remains orange
(iii)
but-1-ene: (bromine) turns (from orange to) colourless / decolourised
no double bond / saturated
but-2-ene
(ii)
(i)
Answer
(b)
6 (a)
Question
number
ACCEPT comments about binding to
haemoglobin / forming
carboxyhaemoglobin
ALLOW equations which finish:
ń C6H14 + 2C2H4
ń C4H10 + 3C2H4
ń C2H6 + 4C2H4
ACCEPT
x alkenes need in polymer
industry
x to make useful plastics
IGNORE starting colour of bromine
1 mark for formula
1 mark for name
Notes
Total: 11
2
2
2
2
1
2
Marks
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Answer
Mg + CuSO4 Æ MgSO4 + Cu
gains (two) electrons
reduction
Any two from:
x (blue) colour of solution fades /solution turns colourless
x brown/pink/pink(y)-brown solid forms
x gets warm/hot
(i)
(ii)
(iii)
(c)
extra decimal place / trailing zero / to 0.01 g
1 mark for correct species
1 mark for balance
2Cl¯ ˆ Cl2 + 2e
Cathode = chlorine
Anode = copper
An explanation linking the following points:
x green colour spreads throughout liquid
x (because of) diffusion
Answer
(b)
8 (a)
Question
number
(c)
(b)
7 (a)
Question
number
NOT solution turns clear
ALLOW precipitate
ALLOW fizzing / bubbles
1 mark for reactants
1 mark for products
Notes
ALLOW 2Cl¯ - 2e ˆ Cl2
Award 1 mark for both correct
products, but at incorrect electrodes
ACCEPT dark green at bottom and
light green at top
Notes
Total: 7
max 2
1
1
2
1
Marks
Total: 6
2
2
2
Marks
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79
A
E
(ii)
(iii)
C
(i)
35 (minutes)
(iii)
(c)
An explanation linking the following points:
x reaction rate slows down
x (because there are) fewer hydrogen peroxide particles
x (therefore) less frequent collisions/fewer collisions per
second
(ii)
catalyst
2 (cm3)
Answer
(i)
(b)
9 (a)
Question
number
ACCEPT any number between 30 and
35
ACCEPT hydrogen peroxide is less
concentrated
Notes
Total: 9
1
1
1
1
1
3
1
Marks
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(c)
(b)
10 (a)
ACCEPT 0.8 cm (for candidates who
use their own ruler)
ALLOW consequential on answer to
(c)(i)
1.5 ± 0.1 (cm)
3.7 – 3.8 (cm3)
(i)
(ii)
Total: 9
1
1
max 4
Any two of the following pairs of statements:
x not left long enough
x therefore precipitate / solid not fully settled
OR
x too much potassium iodide added
x so more precipitate made
OR
x tube not vertical when precipitate was settling
x so precipitate not level in the tube
(ii)
ACCEPT reasonable alternatives, as
long as they explain why the height is
too high
1
correct point circled (at 12cm3 of lead(II) nitrate added)
Marks
(i)
ACCEPT any way in which this point is
indicated
Notes
2
Answer
An explanation linking the following points:
x more precipitate as more lead(II) nitrate present (to react
with potassium iodide)
x but eventually all potassium iodide used up / lead(II) nitrate
becomes in excess / the reaction finishes
Question
number
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81
(d)
(c)
(b)
11 (a)
translating this ratio to a formula = NaClO3
simplest whole number ratio = 1:1:3
dividing by Ar values: Na 21.6/23
Cl = 33.3/35.5
iodine (formed, and it is brown in solution)
(iii)
calculation of % O = 45.1
displacement / redox
(ii)
2 Clî + I2
2(I–) and
7 electrons in outer shell
8 electrons in middle shell
An explanation linking the following points:
x 8 electrons in outer(most) shell
x does not easily/readily gain or lose electrons
Answer
(i)
Question
number
O = 45.1/16
Final answer consequential on slips in
calculation above
If division by atomic number, neither
2nd nor 3rd mark can be scored –
although 4th mark can (probably
NaClO3 or Na8Cl8O23)
I2
ACCEPT oxidation and reduction
1 mark – correct formulae
1 mark – correct balancing
ACCEPT dots, circles, crosses or e to
represent electrons
ACCEPT full outer(most) shell
ACCEPT argument based on energy
required
Notes
Total: 12
4
1
1
2
2
2
Marks
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(d)
measure the boiling point / freezing point
(c)
any named gas that burns in oxygen to form water as a product
e.g. methane, ethane
100°C / 0°C
A description linking the following points:
x measure the volume of gas produced
x using a graduated test-tube / gas syringe / inverted measuring
cylinder
An explanation linking the following points:
x reaction rate is faster
x (therefore) counting bubbles is more difficult / bubbles may
form continuous stream
Answer
(b)
12 (a)
Question
number
ACCEPT correct formula for gas
boils at 100°C OR freezes at 0°C are
worth 2 marks
ACCEPT:
answers which lead to decreased rate
to allow bubble counting to work
e.g.
x reduced concentration of acid
/ larger pieces of zinc
x to slow rate / make bubbles
smaller
ACCEPT:
x bubbles may be different size
x so not valid / poor comparison
with first experiment
Notes
Total: 7
1
2
2
2
Marks
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83
A description linking the following points:
x add aqueous sodium hydroxide (and warm)
x gas / ammonia (given off)
x turns (damp) red litmus blue
(f)
recirculated / recycled / re-used / returned to reaction chamber /
used to make more ammonia
(ii)
NH3 + HNO3 ń NH4NO3
An explanation linking the following points:
x ammonia has low boiling point / liquefies
x (therefore) mixture is cooled
(i)
(e)
(d)
An explanation linking four of the following points:
x increased pressure favours forward reaction / increases yield
x increased pressure also increases rate
x decreased temperature favours forward reaction / increases
yield
x decreased temperature decreases rate
x concluding comment e.g. greater yield, but probably at
reduced rate / increase in rate due to pressure cancels
decrease in rate due to temperature change
(c)
Concluding comment must be present to score full 4 marks, but can
be agreement or disagreement with scientist’s idea.
forward and reverse reactions are occurring
at same rate/speed
to speed up the reaction OR
to allow a lower temperature to be used but still have a reasonably /
acceptably fast reaction
Answer
(b)
13 (a)
Question
number
ACCEPT forms white smoke with HCl
ACCEPT good idea but increased
pressure increases cost
ACCEPT moves equilibrium to right
ACCEPT moves equilibrium to right
ACCEPT amounts of reactants /
products / macroscopic properties
remain constant
ACCEPT to lower the activation
energy / achieve a better balance of
yield and rate
Notes
Total: 14
3
1
1
2
max 4
2
1
Marks
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(d)
(c)
(b)
14 (a)
(ii)
(i)
An explanation linking any two of the following points:
x small molecules
x weak (attractive) forces between molecules
x (therefore) little energy required to overcome forces /
separate molecules
exothermic, because it burst into flames
6 × 18 = 108
257 / 108 = 51.4 / mass water
mass water = 21.6 kg
(iii)
x
x
x
moles phosphine = 51400 / 257
moles water = moles phosphine × 6
mass water = moles water × 18 = 21600 g / 21.6 kg
low / small
OR
x
x
x
(65 × 3) + (31 × 2)
= 257
An explanation linking the following points:
x ions are not free to move in solid (IGNORE ref to electrons)
x (however) ions are free to move when molten
P3î
Answer
(ii)
(i)
(ii)
(i)
Question
number
Total: 14
max 2
2
1 mark for 3 bonding pairs
1 mark for non-bonding pair
ACCEPT “weak bonds”, but not
“weak covalent bonds”
1
1
3
2
2
1
Marks
NOT just ‘exothermic’
ACCEPT answer in g or kg, as long as
unit matches value
Mark consequentially on (b)
Award 1 mark for correct use of Mr of
Zn and P
REJECT any mention of electron
movement
ACCEPT Pî3
Notes
Write your name here
Surname
Other names
Edexcel
Certificate
Centre Number
Candidate Number
Physics
Paper: 1P
Sample Assessment Material
Time: 2 hours
Paper Reference
KPH0/1P
You must have:
Ruler, protractor, calculator
Total Marks
Instructions
black ink or ball-point pen.
t Use
in the boxes at the top of this page with your name,
t Fill
centre number and candidate number.
all questions.
t Answer
the questions in the spaces provided
t Answer
– there may be more space than you need.
t Show all the steps in any calculations and state the units.
Information
total mark for this paper is 120.
t The
marks for each question are shown in brackets
t The
– use this as a guide as to how much time to spend on each question.
Advice
Read each question carefully before you start to answer it.
t Keep
on the time.
t Write anyoureyeanswers
and in good English.
t Try to answer everyneatly
t Check your answersquestion.
if you have time at the end.
t
Turn over
S41080A
©2011 Edexcel Limited.
*S41080A0130*
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85
EQUATIONS
You may find the following equations useful.
energy transferred = current × voltage × time
E=I×V×t
pressure × volume = constant
p1 × V 1 = p 2 × V 2
pressure
= constant
kelvin temperature
p1 p2
=
T1 T2
frequency =
1
time period
f =
1
T
power =
work done
time taken
P=
W
t
power =
energy transferred
time taken
P=
W
t
v=
2 ×π × r
T
orbital speed =
2π × orbital radius
time period
Where necessary, assume the acceleration of free fall, g = 10 m/s2.
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Answer ALL questions.
1 The Solar System contains planets, comets and satellites.
(a) Answer the following questions by placing a cross ( ) in the appropriate box.
(i)
When one object goes around another in space, it follows a path called
(1)
A a circle
B an equator
C an orbit
D an oval
(ii) Which force is responsible for planets following their paths around the Sun?
(1)
A friction
B gravity
C magnetism
D upthrust
(iii) Which force is responsible for artificial satellites following their paths around
the Earth?
(1)
A friction
B gravity
C magnetism
D upthrust
(iv) Moons are natural satellites of
(1)
A asteroids
B comets
C planets
D stars
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87
(b) State one similarity in the movement of planets and comets.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(c) State one difference between the movement of planets and comets.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(d) Explain how the speed of a comet changes as it moves.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 1 = 8 marks)
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2 A student is investigating how the extension of a spring varies when she changes the
force stretching it.
The photograph shows how she sets up her experiment.
spring
hanging
mass
100 g
masses
The student has a ruler marked in centimetres.
Each mass is marked ‘100 g’.
The student writes the following plan:
x
x
x
x
I will hang 100 g on the spring.
I will hold the ruler next to the spring and measure the length of the spring.
I will add another mass and measure the length again.
I will repeat this process until I have enough measurements.
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(a) Explain how the student could improve her plan to make her measurements more
accurate.
(5)
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(b) State, with a reason, a suitable safety precaution the student should take when
carrying out her experiment.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) Describe how the student should convert her measurements of mass into forces.
(2)
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(d) The student plots a graph of force against extension.
She finds that the spring obeys Hooke’s law.
On the axes below, sketch the line she gets.
(2)
Force in N
0
Extension in cm
(Total for Question 2 = 10 marks)
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3 A triathlon race has three parts: swimming, riding a bicycle and running.
(a) The diagram shows the force responsible for the forward movement of an athlete
in the swimming part of the race.
Label the diagram to show two other forces acting on the athlete.
(2)
(b) The table shows the distance of each part of a triathlon race and the time an
athlete takes for each part.
Part of race
Distance in m
Time in s
1 500
1 200
riding a bicycle
40 000
3 600
running
10 000
2 000
swimming
(i)
Calculate the athlete’s average speed for the whole race.
(2)
Average speed =
92
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m/s
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(ii) The graph shows how the distance varied with time for the running part of
the race.
10000
9000
8000
7000
6000
distance in m
5000
4000
3000
2000
1000
0
0
500
1000
time in s
1500
2000
Describe how the athlete’s speed changed during this part of the race.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 3 = 7 marks)
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4 Using mains electricity can be dangerous.
(a) Suggest two safety precautions you should take when putting a plug into a mains
socket.
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
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2 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
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(b) Mains electricity provides an alternating current (a.c.)
A battery provides direct current (d.c.)
Describe the difference between a.c. and d.c.
(2)
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(c) The photograph shows two mains plugs.
mains plug A
mains plug B
Mains plug A has a connection for an earth wire.
Mains plug B does not have an earth connection.
(i)
Describe how the earth wire can act together with a fuse as a safety device.
(2)
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(ii) Explain why mains plug B can be safe to use even though it has no earth
connection.
(2)
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(d) A fuse is rated at 13 A.
The mains voltage is 230 V.
Calculate the maximum power that can be supplied using this fuse.
State the correct unit in your answer.
(3)
Maximum power = .................................................. Unit
............................... . . . . . . . . . . . . . . . . . . .
(Total for Question 4 = 11 marks)
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95
5 Two students notice some small objects falling from a tree.
The objects have wings that make them spin around and fall slowly.
seed
wing
The students find out that this is the way that the tree spreads its seeds.
They decide to use these ‘winged seeds’ for an investigation.
They drop several seeds from a window and collect the data shown in the table.
Average mass of a winged seed
0.25 g
Vertical distance fallen
5m
Average time taken for a winged seed to fall
12 s
(a) Explain why it is a good idea to use a distance of 5 m in this experiment.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) Describe how the students should find the average mass of a winged seed.
(2)
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(c) (i)
State the equation linking gravitational potential energy, mass, g and height.
(1)
(ii) Calculate the average gravitational potential energy lost by one winged seed
as it falls a vertical distance of 5 m.
(2)
Gravitational potential energy =
..............................................
J
(iii) Describe what happens to this energy.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 5 = 9 marks)
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97
6 Electromagnetic waves called T-rays (short for tera-rays) are used in some airport
security scanners.
T-rays:
x pass through clothes
x bounce off the human body
x do not pass through or bounce off metal.
(a) Put a cross (8) in the appropriate box to indicate the correct ending for each
sentence.
(i)
T-rays are absorbed by
(1)
clothes
the human body
metal
(ii) T-rays are reflected by
(1)
clothes
the human body
metal
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(b) (i)
State the equation linking wave speed, frequency and wavelength.
(1)
(ii) T-rays have a wavelength of 3 × 10–4 m and travel at a speed of 3 × 108 m/s.
Calculate the frequency of T-rays.
State the correct unit in your answer.
(3)
Frequency = .................................................. Unit
............................... . . . . . . . . . . . . . . . . . . .
(iii) The table shows data for some waves in the electromagnetic spectrum.
Type of wave
Typical wavelength
Radio waves
Microwaves
T-rays
Infrared waves
30 m
3 × 10–2 m
3 × 10–4 m
3 × 10–6 m
A student concludes:
I think that the airport scanners are safe to use because
T-rays have a long wavelength.
Evaluate the student’s conclusion.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 6 = 8 marks)
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7 Radioactive materials emit different types of ionising radiation.
(a) Complete this table for ionising radiations.
(3)
Type of radiation
alpha
Nature of radiation
Charge
two neutrons and
two protons
beta
negative
an electromagnetic wave
zero
(b) A nucleus decays and emits an alpha particle.
State the result of this decay on the atomic (proton) number and mass (nucleon)
number of the nucleus.
(2)
atomic (proton) number
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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mass (nucleon) number
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(c) Describe how radioactivity can be used to estimate the age of archaeological
discoveries such as wooden boats and animal bones.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 7 = 9 marks)
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101
8 A student is investigating the relationship between voltage and current.
(a) State the equation linking voltage, current and resistance.
(1)
(b) The meters show the current in a resistor and the voltage across it.
Current in mA
(i)
Voltage in V
Complete this table by recording the readings shown on the meters.
Give your values to an appropriate precision.
(1)
102
Current
in mA
0.20
0.60
1.01
1.14
1.81
2.22
Voltage
in V
1.0
3.0
5.0
7.0
9.0
11.0
Edexcel Certificate in Double Award Science
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(ii) Use the data in the table to draw a graph of current against voltage.
(5)
(iii) Circle the anomalous point on the graph.
(1)
(iv) How did you decide that this point was anomalous?
(1)
............................................................................................................................... ....................................................
............................................................................................................................... ....................................................
............................................................................................................................... ....................................................
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(v) Use your graph, or the table, to find the resistance of the resistor that the
student used.
(2)
Resistance = .................................................. Ω
(c) The student wants to investigate the effect of changing light intensity on a circuit.
The student sets up equipment outside in a garden for an experiment lasting 24 hours.
The student uses the circuit shown below.
A
X
V
(i)
Give the name of the component labelled X.
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(ii) List the variables that the student should measure.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(iii) Explain why the student might need help to take all the readings for this
investigation.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iv) The graph below shows some results of the student’s investigation.
Label both axes with appropriate quantities and units.
(2)
600
500
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . .
400
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . .
300
200
100
0
0.00
6.00
12.00
18.00
24.00
. . . . . . . . . . . . . . . . . . . . . . . . . ..................................................................................................... ................................
(Total for Question 8 = 18 marks)
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9 Energy can be transferred by radiation, conduction or convection.
(a) Compare the processes of transferring energy by conduction and transferring
energy by convection.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) Convection was used in the past to ensure that miners who worked underground
had a fresh air supply to breathe.
The diagram shows a mine. A fire has been lit in a furnace at the bottom of one
shaft.
furnace
(i)
Explain how lighting a fire in this way helped to keep a supply of fresh air
moving through the mine.
You may draw on the diagram above to help illustrate your answer.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
106
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(ii) In an earlier system, the fire was lit at the surface of the mine.
chimney
fire in a furnace
This system was less effective at keeping fresh air moving through the mine.
Suggest why.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 9 = 8 marks)
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107
10 A student compares two electric lamps.
The lamps have the same brightness.
Type of lamp
filament lamp
energy-saving lamp
100
20
5
5
Electrical energy
transferred
in J/s
Useful light energy
emitted
in J/s
(a) Both lamps waste energy.
(i)
How much energy does the filament lamp waste each second?
(1)
...........................................................
J
(ii) Describe what happens to the energy wasted by the filament lamp.
(2)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... . . . . . . . . . . . . . . . . . . .
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(b) (i)
Calculate the efficiency of the energy-saving lamp.
(2)
Efficiency =
..............................................................
(ii) Sketch a labelled Sankey diagram to show the energy transfers in the energysaving lamp.
(3)
(c) The lamps in the student’s house are connected in parallel.
State two benefits of connecting lamps in parallel.
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
2 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
(Total for Question 10 = 10 marks)
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109
11 A student investigates electromagnetic effects.
(a) Firstly, he tests this circuit.
magnet
switch
two horizontally
clamped copper rods
thick
copper
wire
battery
When he presses the switch, the thick copper wire rolls along the clamped
copper rods, away from the magnet.
(i)
Explain why this happens.
(3)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(ii) On the diagram, draw an arrow to show the direction of the current in the
circuit when the switch is pressed.
(1)
(iii) State two changes the student could make so that the copper wire moved
away more quickly when he pressed the switch.
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
2 . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............. .............................................................................................................................. . . . . . . . . . . . . . . . . .
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(b) The student investigates another effect using a coil of wire, a sensitive meter and a
magnet.
motion
meter
When he moves the magnet towards the coil, the meter gives a reading to the
right.
(i)
What is the name of this effect?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(ii) State two changes the student could make so that the meter gives a larger
reading to the right.
(2)
1 . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ ............................................................................................................................ . . .. . . . . . . . . . . . . . .
. . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . . . . . . . . . . . .
2 . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............. .............................................................................................................................. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... .. . . . . . . . . . . . . . . . . .
(iii) How could the student make the meter give a reading to the left?
(1)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
(Total for Question 11 = 10 marks)
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111
12 The human eye contains liquid.
The liquid exerts a pressure on the inside of the eye.
This pressure is higher than atmospheric pressure from the air on the outside of the
eye.
(a) Explain, in terms of molecular motion, how the air exerts a pressure on the outside
of the eye.
(4)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(b) A doctor uses a tonometer to measure the excess pressure (how much higher the
pressure is than atmospheric pressure) of the liquid in the eye.
The tonometer pushes on the person’s eye with a very small force.
tonometer
eye
direction
of small
force
The tonometer pushes on the eye with a force of 0.015 N.
The tonometer touches an area of 7.35 × 10–6 m2.
Show that the pressure that the tonometer exerts is about 2 kPa.
(3)
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(c) Doctors think that a healthy excess pressure in the eye is ‘about 15 mm Hg’.
This equals the pressure difference produced by a 0.015 m column of mercury.
The density of mercury is 13 600 kg/m3.
Explain whether or not the excess pressure of 2 kPa in part (b) is healthy for the
eye.
Use a suitable calculation to support your answer.
(5)
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................... .. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... .. . . . . . . . . . . . . . . . . .
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(Total for Question 12 = 12 marks)
TOTAL FOR PAPER = 120 MARKS
114
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115
C
(iv)
(d)
Answer
An explanation linking the following:
x the comet travels faster when it is nearer the Sun / the comet
is travelling at 2›r/T
x (because) the gravitation attraction from the Sun is stronger
when the comet is close / the force of gravity from the Sun is
stronger when the comet is closer
shape of orbit
B
(iii)
(c)
B
(ii)
both orbit Sun
C
(i)
(b)
1 (a)
Question
number
Paper 1P
Sample Mark Scheme
ACCEPT a reasonable alternative
ACCEPT period of orbit
Notes
Total: 8
2
1
1
1
1
1
1
Marks
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wear eye protection
(as there is a) risk of spring 'flying back' into face
OR
care against tipping over / clamp the stand (with a G clamp)
(as there is a) risk of falling onto feet /sending spring flying
OR
protection on floor/desk / use as low a height as possible
(as there is a) risk of damage to feet
the force she needs is the weight of the masses
and W = mg
OR
convert mass to kg
multiply by g
straight line
through the origin
(c)
(d)
An explanation linking five of the following:
x check each mass on scales/balance
x use a ruler marked in mm / smaller division
x fix ruler in clamp (next to the spring), with the zero next to
start of the spring
x check the ruler is vertical with a suitable device eg set square
x attach marker/pin to top/bottom of spring
x measure at eye level to avoid parallax
Answer
(b)
2 (a)
Question
number
REJECT “multiply by 10” unless it is
clear that this is g
Reason given must match the
precaution
Precaution must be relevant to the
experiment
Notes
Total: 10
2
2
1
max 5
Marks
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117
(ii)
A description including three from:
x starts with constant speed
x slows down
x speeds up again
x correct ref to slope
x correct ref to coordinates
51500 y 6800 = 7.57 (m/s)
total distance (51 500) and total time (6800) seen
(b)
(i)
Any two forces correctly shown on diagram from:
x drag
x gravity
x upthrust
Answer
3 (a)
Question
number
ACCEPT 7.6 (m/s)
Each force arrow must be in the
correct direction
Notes
Total: 7
max 3
2
max 2
Marks
118
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(d)
(c)
(b)
4 (a)
(ii)
(i)
Question
number
ACCEPT 2.99 kW / 3000 W / 3 kW
Unit mark independent of answer
unit (W or J/s)
ALLOW:
turn socket off
keep metal objects away from pins
Notes
answer = 2990
statement of P = IV or 13 × 230 seen
An explanation linking two of the following:
x term double insulation (applied to plug, cable or appliance)
x idea that insulation stops current / does not conduct
x idea that electric shocks are currents
x idea of a second insulation layer in case the first fails
A description including two from:
x large current in earth wire / charge flows to earth
x large current in fuse
x fuse melts / blows / breaks circuit
x stopping electrocution
a.c. – electron/current motion reverses (regularly)
d.c. – electrons/current motion only in one direction
Any two of:
x beware of frayed cable
x beware of damaged plug
x beware of water
Answer
Total: 11
3
max 2
max 2
2
max 2
Marks
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119
(transferred to) thermal (heat) energy in the surroundings
ACCEPT sound
answer = 0.0125 (J)
(transferred to) kinetic energy (of the seed)
ALLOW 1 mark if 0.25g used, giving
12.5J
substitution (0.00025 × 10 × 5)
(ii)
(iii)
ecf on equation in (i)
GPE = m × g × h
(i)
(c)
if left blank, can credit correct
statement of equation seen in (ii)
Notes
A description including:
x method of measuring mass e.g. scales / balance
x with EITHER idea of őn OR idea of repeated readings
An explanation linking the following:
x improves accuracy / reduces % uncertainty
x (because) allows longer time measurement / reduces impact of
reaction time
Answer
(b)
5 (a)
Question
number
Total: 9
2
2
1
2
2
Marks
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(b)
6 (a)
(iii)
rearrangement / substitution : f = 3 × 108 ÷ 3 × 10-4
(ii)
Agreement with the conclusion:
x T-rays do not penetrate the human body
x (because) T-rays are reflected / bounce off
Disagreement with the conclusion:
x T-rays have shorter wavelength / higher frequency / more
energy (than radio / microwave) or appropriate correct
reference to wavelengths
x (likely to) cause increase of named detrimental effect (e.g. skin
burns)
OR
An explanation linking the following:
unit = Hz / s-1
answer = 1 x 1012
v=fũ
the human body
(ii)
Answer
(i)
metal
(i)
Question
number
NB there is no mark for stating
agreement / disagreement with the
conclusion
Unit mark independent of answer
if left blank, can credit correct
statement of equation seen in (ii)
ecf for omitted equation in (i)
Notes
Total: 8
2
3
1
1
1
Marks
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121
(c)
(b)
7 (a)
Question
number
electron / e
Nature of
radiation
positive
Charge
A description including any four from:
x (living things contain) carbon (14)
x C14 is a radioactive isotope / beta emitter
x (radio)activity decreases (over time)
x (estimate) half-lives (since material was alive)
x compare activity (of sample now with living tissue) / ratio of
C14 to C12 is fixed in living material
mass number: decreases by four
atomic number: decreases by two
gamma / J
Type of
radiation
Answer
ACCEPT +ve / 2+ / +2
Notes
Total: 9
max 4
2
3
Marks
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(b)
8 (a)
2.62 and 13.0
suitable scale chosen (>50% of grid used) ;
line of best fit acceptable ;
axes labelled with scales and units ;
plotting to nearest half square (minus one for each error) ;;
1.14, 7.0 identified / circled
does not fit with the pattern of the others / well away from the line
conversion of reading from graph from mA to A
answer = 4950 ± 50 (ö)
(ii)
(iii)
(iv)
(v)
voltage = current × resistance
Answer
(i)
Question
number
4.95 (± 0.05) scores 2nd mark only
4.95 (± 0.05) kö scores both marks
deduct 1 mark for each incorrect plot
NOT 13.00
ACCEPT V = IR or rearrangement
Notes
2
1
1
1
1
1
2
1
1
Marks
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123
(c)
light dependent resistor
time
voltage and current
An explanation linking two of the following:
x difficulty in taking readings over long time
x difficulty in taking two or more readings simultaneously
x appropriate named simultaneous readings (e.g. time and
resistance; voltage and current; time, voltage and current)
x idea that second person / datalogger could assist with above
resistance in ohms
time in hours / time of day / clock time
(i)
(ii)
(iii)
(iv)
both quantities but no units – 1 mark,
both units but no quantities – 1 mark
2
ACCEPT “time of day” for time
ACCEPT resistance
Total: 18
2
max 2
1
ACCEPT LDR
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(b)
9 (a)
heated air only rises from surface
(ii)
air in shaft only 'drawn up', not rising itself
OR convection currents are not set up as efficiently
A explanation linking the following:
x heated air expands / becomes less dense
x (therefore) rises (up the shaft)
x (this) sets up convection current so fresh air moves down other
shaft
CONVECTION:
x particles able to move
x transfer the energy by their movement / kinetic energy
CONDUCTION:
x from particle to particle
x by collision
Any three from:
Answer
(i)
Question
number
Notes
Total: 8
2
3
max 3
Marks
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© Edexcel Limited 2011
125
(c)
(b)
10 (a)
(ii)
failure of one allows others to continue working
independent control
at least 2 correct labels
widths of arrows in proportion
recognisable Sankey diagram
answer = 0.25
equation / substitution of values = 5 ÷ 20
A description including two from:
x converted / transformed
x into thermal energy
x dissipated to surroundings
(ii)
(i)
95 (J)
Answer
(i)
Question
number
ALLOW reverse arguments based on
problems with series connection
Points in either order, and could be
explained with a diagram
ALLOW 25 %
ALLOW heat for thermal energy
Notes
Total: 10
2
3
2
max 2
1
Marks
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11
(b)
(a)
Any two from:
x stronger magnet
x more turns (on coil)
x move faster (towards coil)
x lower resistance wire
move magnet away from coil / turn the magnet round / reverse
connections on the meter
(ii)
(iii)
Any two from:
x higher current / higher voltage
x lower resistance wires
x stronger magnet
(iii)
electromagnetic induction
arrow indicating anticlockwise direction somewhere in or near the
electric circuit
(ii)
(i)
An explanation linking three of the following:
x current in the (thick) copper wire
x sets up a magnetic field (around it)
x which interacts (OWTTE) with the field of the magnet
x there is a force on the wire
Answer
(i)
Question
number
NOT bigger magnet
NOT more coils
ALLOW generator effect
NOT bigger magnet
Notes
Total: 10
1
max 2
1
max 2
1
max 3
Marks
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© Edexcel Limited 2011
127
(c)
(b)
12 (a)
Question
number
An explanation linking the following:
x uses formula : P = hŬg
x conversion of 15mm into m i.e. 0.015 m
x substitution : 0.015 u 13600 u 10
x answer = 2040 Pa
x appropriate comment about pressure being healthy
conversion to 2 kPa
answer = 2041 Pa
equation (pressure = force ÷ area) / substitution = 0.015 ÷ 7.35 u 10-6
An explanation linking four of the following:
x random motion (or air molecules)
x (create( impact(s) on outside of eye
x (particle’s) momentum/direction changes
x (therefore) force produced
x on the area outside (the eye)
x reference to pressure = force/area
Answer
ACCEPT similar reverse argument:
x uses formula : P = hŬg
x substitution : 2000 = h u 13600 u
10
x answer : h = 0.0147 m
x conversion of answer to mm i.e.
14.7 mm
x appropriate comment about
pressure being healthy
Notes
Total: 12
5
3
max 4
Marks
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