Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
A-level
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Tuesday 12 June 2018 Afternoon Time allowed: 2 hours
Materials For Examiner’s Use
For this paper you must have:
• the Periodic Table/Data Booklet, provided as an insert (enclosed) Question Mark
• a ruler with millimetre measurements 1
• a scientific calculator, which you are expected to use where appropriate. 2
Instructions 3
• Use black ink or black ball-point pen. 4
• Fill in the boxes at the top of this page. 5
• Answer all questions.
6
• You must answer the questions in the spaces provided. Do not write outside
the box around each page or on the blank pages. 7
• Do all rough work in this book. Cross through any work you do not want to be 8
marked.
9
Information 10
• The marks for questions are shown in brackets. 11
• The maximum mark for this paper is 105.
TOTAL
*jun187405201*
IB/M/Jun18/E10 7405/2
, Do not write
outside the
2 box
Answer all questions in the spaces provided.
0 1 This question is about the reactions of alkanes.
0 1 . 1 Alkanes can be used as fuels.
Give an equation for the combustion of heptane (C7H16) in an excess of oxygen.
[1 mark]
0 1 . 2 Heptane can be obtained from the catalytic cracking of hexadecane (C16H34) at a high
temperature.
Identify a suitable catalyst for this process.
Give one condition other than high temperature.
Give an equation for the catalytic cracking of one molecule of hexadecane to produce
one molecule of heptane, one molecule of cyclohexane and one other product.
[3 marks]
Catalyst
Condition
Equation
0 1 . 3 Alkanes can be used in free-radical substitution reactions to produce
halogenoalkanes.
Give equations for the propagation steps in the reaction of butane to form
2-chlorobutane.
[2 marks]
*02*
IB/M/Jun18/7405/2
, Do not write
3 outside the
box
0 1 . 4 Chlorofluorocarbons (CFCs) are a group of halogenoalkanes currently banned in
many countries. They cannot be used as solvents or refrigerants because of their
effect on the environment.
The structure of a CFC is shown.
Identify the radical produced from this CFC that is responsible for the depletion of
ozone in the atmosphere.
Explain, with the aid of equations, why a single radical can cause the decomposition
of many molecules of ozone.
[4 marks]
Radical
Explanation
10
Turn over for the next question
Turn over ►
*03*
IB/M/Jun18/7405/2
Centre number Candidate number
Surname
Forename(s)
Candidate signature
A-level
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Tuesday 12 June 2018 Afternoon Time allowed: 2 hours
Materials For Examiner’s Use
For this paper you must have:
• the Periodic Table/Data Booklet, provided as an insert (enclosed) Question Mark
• a ruler with millimetre measurements 1
• a scientific calculator, which you are expected to use where appropriate. 2
Instructions 3
• Use black ink or black ball-point pen. 4
• Fill in the boxes at the top of this page. 5
• Answer all questions.
6
• You must answer the questions in the spaces provided. Do not write outside
the box around each page or on the blank pages. 7
• Do all rough work in this book. Cross through any work you do not want to be 8
marked.
9
Information 10
• The marks for questions are shown in brackets. 11
• The maximum mark for this paper is 105.
TOTAL
*jun187405201*
IB/M/Jun18/E10 7405/2
, Do not write
outside the
2 box
Answer all questions in the spaces provided.
0 1 This question is about the reactions of alkanes.
0 1 . 1 Alkanes can be used as fuels.
Give an equation for the combustion of heptane (C7H16) in an excess of oxygen.
[1 mark]
0 1 . 2 Heptane can be obtained from the catalytic cracking of hexadecane (C16H34) at a high
temperature.
Identify a suitable catalyst for this process.
Give one condition other than high temperature.
Give an equation for the catalytic cracking of one molecule of hexadecane to produce
one molecule of heptane, one molecule of cyclohexane and one other product.
[3 marks]
Catalyst
Condition
Equation
0 1 . 3 Alkanes can be used in free-radical substitution reactions to produce
halogenoalkanes.
Give equations for the propagation steps in the reaction of butane to form
2-chlorobutane.
[2 marks]
*02*
IB/M/Jun18/7405/2
, Do not write
3 outside the
box
0 1 . 4 Chlorofluorocarbons (CFCs) are a group of halogenoalkanes currently banned in
many countries. They cannot be used as solvents or refrigerants because of their
effect on the environment.
The structure of a CFC is shown.
Identify the radical produced from this CFC that is responsible for the depletion of
ozone in the atmosphere.
Explain, with the aid of equations, why a single radical can cause the decomposition
of many molecules of ozone.
[4 marks]
Radical
Explanation
10
Turn over for the next question
Turn over ►
*03*
IB/M/Jun18/7405/2
