ORGANIC
CHEMISTRY
May exam 2013
ENERGY
CHANGE
Planning -
SECTION A
Q1
ONE WORD
1.-1.3
1.1
SECTION B
Q2
MCQ
2.1, 2.2
Q3
x
Q4
X
Q5
X
Q6
X
Q7
X
Q8
X
Q9
X
A
B
C
D
Knowledge,recall, low demand
Comprehension, routine ex.
Application, problem solving
Higher abilities, challenging
Q’s
1
2.3 -2.8
1.3 – 1.4
2
1.1; 1.2
2.2; 2.3; 2.6
2.1; 2.4; 2.7; 2.8
3
3.1; 3.2
3.4; 3.5; 3.6
3.3; 3.7
4
4.2
4.1, 4.4
4.3; 4.5;
5
4.6
5.1 – 5.5
6
6.7
6.1-6.6
7
7.1; 7.4; 7.5
7.2; 7.3; 7.6; 7.7
8
9
2.5
8.1;8.2;8.3;8.34
9.3
9.1; 9.2; 9.4
8.5
WESTERFORD and CLAREMONT HIGH SCHOOL
Physical Science
GRADE 12
CHEMISTRY: PAPER 2
MAY 2013
EXAMINER:
F. MOOS
TIME:
MARKS:
2 HOURS
100 MARKS
INSTRUCTIONS
1.
Answer ALL the questions.
2.
Answer SECTION A on the ANSWER SHEET and SECTION B on the folio
provided. Start each question on a new sheet of paper.
3.
Number the answer in the same way that the questions are numbered. Leave
one line open between subsections of questions.
4.
Non-programmable calculators may be used. Appropriate mathematical
instruments may be used.
5.
Data sheets will be provided.
6.
Use black or blue ink only for your answers, other than sketches and diagrams
where a sharp pencil must be used.
7.
Give ALL the formulae used and show your working, including substitutions.
Your answer must be calculated correctly to two decimal places.
8.
A penalty of 1% will be imposed for each instruction disregarded.
PHYSICAL SCIENCE PAPER II
GRADE 12 ANSWER SHEET 2013
TEACHER
JB
FM
JG
LE
NAME : ___________________________________________
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
TOTAL
QUESTION 1
1.1
1.2
1.3
1.4
QUESTION 2
2.1
A
B
C
D
2.2
A
B
C
D
2.3
A
B
C
D
2.4
A
B
C
D
2.5
A
B
C
D
2.6
A
B
C
D
2.7
A
B
C
D
2.8
A
B
C
D
CLAREMONT HIGH SCHOOL
PHYSICAL SCIENCE PAPER II
GRADE 12 ANSWER SHEET 2013
NAME : ___________________________________________
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
TOTAL
QUESTION 1
1.1
1.2
1.3
1.4
QUESTION 2
2.1
A
B
C
D
2.2
A
B
C
D
2.3
A
B
C
D
2.4
A
B
C
D
2.5
A
B
C
D
2.6
A
B
C
D
2.7
A
B
C
D
2.8
A
B
C
D
SECTION A
Answer this section on the ANSWER SHEET provided.
QUESTION 1: ONE-WORD ANSWERS
Give ONE word, a term or two words where applicable for each of the following descriptions. Write only
the words/term next to the question number (1.1 to 1.4) on the answer sheet.
1.1
The type of diene depicted by the structure –C=C=C- .
(1)
1.2
A hydrocarbon that has the general formula CnH2n for its ring structures.
(1)
1.3
The reaction type that can be used to convert hydrocarbons with high molecular masses to
hydrocarbons with low molecular masses.
(1)
The unstable intermediate compound formed during a chemical reaction.
(1)
1.4
[4]
QUESTION 2: MULTIPLE-CHOICE QUESTIONS
Four possible options are provided as answers to the following questions.
Each question has only ONE correct answer. Choose only that answer which, in your opinion, is the correct
or best one, and mark the appropriate block on the ANSWER SHEET with a bold pencil cross.
2.1
The diagram below shows the change in potential energy for a hypothetical reaction, represented by
the following equation:
The activation energy for the forward reaction is ....
A.
- 80 kJ
B.
80 kJ
C.
100 kJ
D.
180 kJ
(2)
2.2
The mass of a catalyst was determined at intervals during a reaction.
Which one of the four graphs best represents the change in the mass of the catalyst with time?
(2)
2.3
2.4
Which of the following CANNOT be an alkene?
A.
C2H4
B.
C3H6
C.
C3H8
D.
C4H8
(2)
Aspirin is used as a painkiller and is found in the bark of the Willow tree. The structure of aspirin is
as follows:
What functional groups are present in aspirin?
(i)
Alcohol
(ii) Carboxylic acid
(iii) Ester
A.
i only
B.
i and ii only
C.
ii only
D.
ii and iii only
(2)
2.5
Consider the compound below:
This compound can be prepared by the oxidation of an ....
2.6
2.7
A.
ester
B.
alkene
C.
alcohol
D.
alkane
(2)
Sunflower oil undergoes hydrogenation during the manufacturing process of margarine. During this
process the ....
A.
the number of double bonds decreases
B.
the carbon chains increase in length
C.
the number of single bonds decreases
D.
the compound becomes less saturated.
(2)
Consider the compound below:
This compound is the product of the reaction of...
2.8
A.
ethene with hydrogen bromide
B.
ethene with bromine
C.
ethane with hydrogen bromide
D.
methane with bromomethane
(2)
Which ONE of the following compounds can exist as an isomer?
(2)
[20]
SECTION B
QUESTION 3 [Start on a new sheet of paper]
Alex investigates a way to increase the rate at which hydrogen gas develops in the reaction between zinc and
hydrochloric acid. She then changes a condition in which the effect is represented by the graph.
Curve X denotes the initial condition.
Curve Y denotes the changed condition that resulted in a higher reaction rate.
3.1
Which reaction condition did Alex change?
3.2
What is the name of the energy value denoted by the following :
(1)
3.2.1
P
(1)
3.2.2
Q
(2)
3.3
By comparing the energies of the forward and the reverse reactions, would it be easier to form the
reactants from the products or the products from the reactants for reaction X? Write down only
one of the phrases in bold font.
(2)
3.4
Give a reason for your answer in 3.3 above.
3.5
Which one of the reactions (forward or reverse) for reaction Y is exothermic? Write down one
word only.
(1)
3.6
Give a reason for your answer in 3.5 above.
(2)
3.7
Give a balanced chemical equation for the formation of hydrogen gas.
(2)
(1)
[12]
QUESTION 4 [Start on a new sheet of paper]
Consider the compounds A to G.
4.1
What is the functional group of compound A?
(1)
4.2
Define the term “functional group’.
(2)
4.3
Choose from the list a substance that is used in the laboratory preparation of E. Write down the letter
only.
(2)
4.4
Give the FULL NAME of the catalyst that is needed for the reaction referred to in 4.3.
4.5
Choose from the list a substance that is formed during the oxidation of G. Write down the letter only.
(2)
4.6
Write down the FULL NAME of the new product that could form due to an addition reaction that
occurs between two of the substances from the list.
(2)
(2)
[11]
QUESTION 5 [Start on a new sheet of paper]
An experiment was conducted to measure the vapour pressure of some organic compounds. The results from
the experiment were recorded and tabulated as seen below.
SUBSTANCE
VAPOUR PRESSURE (mm Hg)
Pentane
400
Hexane
100
Heptane
40
Octane
10
5.1
State a suitable investigation question for the experiment.
(2)
5.2
All compounds investigated belong to the same homologous group. Why was the homologous group
kept the same?
(1)
5.3
In the experiment, which variable(s) was (were)
5.3.1
independent
(1)
5.3.2
dependent
(1)
5.3.3
fixed (give one only)
(1)
5.4
What conclusion could be reached from this experiment?
(2)
5.5
Explain fully the trend in vapour pressure in the compounds investigated. (Use no more than 6 lines)
(3)
[11]
QUESTION 6 [Start on a new sheet of paper]
Most organic compounds can undergo substitution or addition or elimination reactions to produce a variety
of organic compounds. Some incomplete organic reactions are represented below:
6.1
Name the type of reaction represented by the reaction III.
(1)
6.2
Both reactions I and II are examples of addition reactions. Name the type of addition that is
represented by each reaction. Write down “reaction I” with the name and “reaction II” with the
name.
(2)
6.3
Write down the structural formula and IUPAC name of the major product formed in reaction I. (3)
6.4
Reaction I only takes place in the presence of a catalyst. Write down the formula of the catalyst used
in reaction I.
(1)
6.5
Write down the structural formula and IUPAC name of the major product formed in reaction II. (3)
6.6
To which homologous series does the organic product formed in reaction I belong?
(2)
[12]
QUESTION 7 [Start on a new sheet of paper]
Two organic compounds are listed below:
A:
B:
4-methyl-2-hexyne
7.1
Give the name of the functional group of compound A.
(1)
7.2
Give the IUPAC name of compound A.
(2)
7.3
Write down the structural formula for compound B.
(3)
7.4
Give the name of the test we use to distinguish compound B from 4-methylhexane.
(1)
7.5
What effect would you see if you carried out the test mentioned in 7.4.? Say what you would observe
in each case.
(2)
7.6
Which compound A or B would have a higher viscosity?
(1)
7.7
Give an explanation for your answer in 7.6. (Use no more than 2 lines)
(2)
[12]
QUESTION 8 [Start on a new sheet of paper]
Some organic reactions are shown in the flow diagram below:
8.1
Write down the structural formula for compound X.
(1)
8.2
Name the type of substitution reaction illustrated by reaction A.
(2)
8.3
In order to obtain product Y, C3H7Br is heated with a concentrated solution of KOH under reflux.
ydysa Use condensed structural formulae to write a balanced equation for the reaction.
(3)
8.4
Name the type of elimination reaction illustrated by reaction D.
(2)
8.5 A group of learners decided to heat C3H7Br with dilute sodium hydroxide, instead of the
dfdsffconcentrated potassium hydroxide.
8.5.1
Write a balanced chemical equation for the reaction. (Structural formulae are not required.)
(2)
8.5.2
Give the IUPAC name of the organic compound that they will obtain.
(1)
[11]
QUESTION 9 [Start on a new sheet of paper]
Study the organic compounds represented by the letters A to D below:
9.1
A
B
C
D
C3H8
CH3CH2CH2CH2OH
CH3COOH
CH3CH2CHCH2
Write down the structural formulae of TWO isomers of compound B.
(4)
9.2
Write down a balanced equation for the combustion reaction of compound A with excess oxygen.
ererrere(Structural formulae are not required.)
(3)
9.3
Is compound D a saturated or an unsaturated hydrocarbon?
(1)
9.4
Write down the structural formula and the IUPAC name of the ester formed when propan-1-ol reacts
dfhggfgwith compound C.
(3)
[11]
TOTAL : 100 marks