Science G-8
REVISION PACK
2016-2017
END OF TERM 2
Name: ________________________
Grade 8
Page 1 of 12
END OF TERM 2 EXAM NOTIFICATION
Subject: Science
Grade: 8
Study List
Units/Chapters
Lesson/s No.
Page/s No.
Book and resources
Unit 7
7.1,7.2,7.3,7.4
CB p:94-103
Worksheet + handout
Unit 8
8.1,8.2,8.3,8.4,8.5,
8.6
CB p: 104-119
Workbook + Handout
Unit 10
10.1,10.2,10.3,10.4
,10.5,10.6,10.7,10.
8,10.9
CB p:140-159
Workbook + Handout
Unit 11
Energy
11.1,11.2,11.3,11.4
,11.5,11.6
CB p:160-175
Workbook + Handout
Salt
Rate of
reaction
Static
Electricity
Revision Pack
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Physics /Chemistry
Section 1
Choose the correct answers
Question 1
Question 2
Question 3
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Question 4
Question 5
Page 4 of 12
Question 6
Question 7
Page 5 of 12
Question 8
Section 2 Give short answers
Question 1
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Question 2
Sodium hydrogencarbonate is present in indigestion powders.
It is often called bicarbonate of
soda. Sodium hydrogencarbonate:
is a white solid
is very soluble in water
does not smell
is not poisonous
forms a solution with a pH of about 8.5
(a) (i)
Is sodium hydrogen carbonate solution acidic, alkaline, or neutral?(1)
.............................................................................................................
(ii) Indigestion can be caused by too much acid in the stomach. Which two pieces of
information in the list are the most important reasons why sodium hydrogen carbonate can be
used as an indigestion powder? (2)
1 .........................................................................................................
2 .........................................................................................................
(b) Nitric acid reacts with sodium hydrogencarbonate. The salt formed is a nitrate. Fill in the
boxes to complete the word equation. (2)
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(c) An indigestion powder contains sodium hydrogencarbonate and a small amount of citric
acid. The powder starts to fizz when it is added to water.
Write a test for the gas given off when the mixture fizzes? (1)
....................................................................................................................
Question 3
Complete the following reactions for neutralization:
acid + base
salts + water
(a) hydrochloric acid + sodium hydroxide
…………………
……………………………… +
(b) hydrochloric acid + potassium hydroxide
…………………
……………………………… +
(c) hydrochloric acid + calcium carbonate
…………………
……………… + …………………+
(ii) Write the test for the gas formed in (c) above
………………………………………………………………………………………………………
………………
Question 4
A student investigated the rate of reaction between marble and
hydrochloric acid. The student used an excess of marble.
Complete the reaction below.
Calcium chloride + hydrochloric acid →
……………… + …………………+ …………………
The student used the apparatus shown in the diagram.
The student measured the mass of the flask and contents every
half minute for ten minutes.
The results are shown on the graph.
Use the graph to answer the
questions.
(a) Complete the graph opposite
by drawing a line of best fit. [1]
(b) Why did the mass of the flask
and contents decrease with time?
[1]
.................................................................................
.................................................................................
.................................................................................
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(c) After how many minutes had all the acid been used up? [1]
.............................. minutes
(d) The student repeated the experiment at a higher temperature. All other variables were kept
the same as in the first experiment. The rate of reaction was much faster.
(i) Draw a line on the graph to show what the results for this second experiment might look
like. [2]
(ii) Why does an increase in temperature increase the rate of reaction? [2]
...........................................................................................................................
...........................................................................................................................
Question 5
A student investigated the rate of reaction between calcium carbonate (marble chips) and
hydrochloric acid.
The student used the apparatus shown in Figure 1.
The student:
•
recorded the volume of gas collected every 5 seconds
•
repeated the experiment using hydrochloric acid at different temperatures.
The equation for the reaction is:
hydrochloric acid + calcium carbonate
calcium chloride + carbondioxide + Water
(a) The student plotted results for the
hydrochloric acid at 20 °C and 40 °C on a graph.
Figure 2 shows the student’s graph.
Use information from Figure 2 to answer these
questions.
(i) State one conclusion the student could make
about the effect of temperature on the rate of the
reaction. [1]
..........................................................................................................
..........................................................................................................
(ii) Give one reason why the student could make this conclusion.[1]
...............................................................................................................
...............................................................................................................
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(iii) For the hydrochloric acid at 60 °C the student had collected 30 cm3 after 15 seconds.
Calculate the average rate of reaction from 0 to 15 seconds. [1]
...............................................................................................................
Rate of reaction = ........................................ cm3 per second
(b) The student then investigated how the surface area of marble chips affected the rate of
reaction.
(i)
Which two variables should the student keep constant? [2]
Tick ( ) two boxes.
Amount of water in the trough
Concentration of acid
Mass of marble chips
Size of marble chips
Volume of measuring cylinder
(ii) Explain, in terms of particles and collisions, the effect that increasing the surface area of
the marble chips has on the rate of reaction. [2]
...............................................................................................................
...............................................................................................................
Question 6
(a) The lamps in the circuits drawn below are all identical.
Each of the cells has a potential
difference of 1.5 volts.
(i) What is the potential difference across the 3 cells that are joined in series?
...............................................................................................................
Potential difference = .................................................. V (1)
(ii) What will be the reading on the voltmeter labelled V3?
Voltmeter reading V3 = .................................................. V (1)
(iii) Which voltmeter, V1, V2 or V3, will give the highest reading?
Draw a ring around your answer. (1)
V1
V2
V3
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Question 7
In a power station, coal can be used to generate electricity.
(a) Use words from the box to answer the questions below.
chemical
electrical
gravitational potential
kinetic
light
sound
thermal
(i) What is the useful energy transfer when coal is burnt? (1)
............................... energy is transferred to ............................. energy
(ii) Some of the energy stored in coal is wasted when it is burnt.
Give the name of one type
of energy released that is not useful. (1)
...............................
(b) Wind turbines are also used to generate electricity.
The wind turns the turbine blades and
the turbine blades turn a generator.
Use words from the box opposite. Complete the sentence to show the
useful energy transfer in a wind turbine and generator. (1)
............................... energy is transferred to ............................. energy
(c) Suggest one disadvantage of using wind to generate electricity. (1)
......................................................................................................................
......................................................................................................................
(d) Sugar cane is a plant.
The sugar from the cane is used to make alcohol.
Alcohol is a fuel.
(i) Which energy source do plants use to produce sugar? (1)
.............................................................................................................
(ii)
(1)
Is sugar cane a renewable or non-renewable source of energy?
Tick one box.
renewable source
non-renewable source
Give a reason for your answer.
.............................................................................................................
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Question 8
(a) The diagrams below show how much heat is lost from different parts of a house every
second.
Through which part of the house above is most
heat lost? [1]
...............................................................
(b) Part of the house is insulated to reduce
the loss of heat.
This is shown below.
(i) Which part of the house has been
insulated? [1]
................................................................
(ii) Explain your answer. [1]
...............................................................................................
...............................................................................................
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