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Candidate signature
I declare this is my own work.
A-level
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Tuesday 18 June 2024 Morning 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.
You must answer the questions in the spaces provided. Do not write outside 6
the box around each page or on blank pages. 7
If you need extra space for your answer(s), use the lined pages at the end of 8
this book. Write the question number against your answer(s).
All working must be shown. 9
Do all rough work in this book. Cross through any work you do not want to 10
be marked. 11
Information TOTAL
The marks for questions are shown in brackets.
The maximum mark for this paper is 105.
*Jun247405201*
7405/2
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Propanone reacts with bromine in alkaline conditions.
CH3COCH3 + Br2 + OH– ⟶ CH3COCH2Br + Br – + H2O
The rate equation for this reaction is
Rate = k [CH3COCH3] [OH–]
0 1 . 1 Sketch a graph on the axes provided to show how, at constant temperature, the
concentration of bromine changes during this reaction.
[1 mark]
*02*
, 3
Do not write
outside the
box
0 1 . 2 Table 1 shows the initial rate of this reaction for experiments using different mixtures
containing propanone, bromine and hydroxide ions.
Table 1
[CH3COCH3] [Br2] [OH–] Initial rate
Experiment
/ mol dm–3 / mol dm–3 / mol dm–3 / mol dm–3 s–1
1 1.50 × 10–2 2.50 × 10–2 2.50 × 10–2 2.75 × 10–11
2 1.50 × 10–2 2.50 × 10–2 8.25 × 10–11
3 3.75 × 10–3 5.00 × 10–2 1.00 × 10–1
Complete Table 1.
Use the data from experiment 1 to calculate the rate constant k for this reaction.
Give the units for the rate constant.
[5 marks]
k Units
Question 1 continues on the next page
Turn over ►
*03*
, 4
Do not write
outside the
box
0 1 . 3 Figure 1 shows an incomplete mechanism for this reaction.
Figure 1
Complete the mechanism in Figure 1 by adding four curly arrows and any relevant
lone pair(s) of electrons.
[4 marks]
0 1 . 4 Use evidence from the rate equation to explain why Step 1 is the
rate determining step.
[1 mark]
11
*04*
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Tuesday 18 June 2024 Morning 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.
You must answer the questions in the spaces provided. Do not write outside 6
the box around each page or on blank pages. 7
If you need extra space for your answer(s), use the lined pages at the end of 8
this book. Write the question number against your answer(s).
All working must be shown. 9
Do all rough work in this book. Cross through any work you do not want to 10
be marked. 11
Information TOTAL
The marks for questions are shown in brackets.
The maximum mark for this paper is 105.
*Jun247405201*
7405/2
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Propanone reacts with bromine in alkaline conditions.
CH3COCH3 + Br2 + OH– ⟶ CH3COCH2Br + Br – + H2O
The rate equation for this reaction is
Rate = k [CH3COCH3] [OH–]
0 1 . 1 Sketch a graph on the axes provided to show how, at constant temperature, the
concentration of bromine changes during this reaction.
[1 mark]
*02*
, 3
Do not write
outside the
box
0 1 . 2 Table 1 shows the initial rate of this reaction for experiments using different mixtures
containing propanone, bromine and hydroxide ions.
Table 1
[CH3COCH3] [Br2] [OH–] Initial rate
Experiment
/ mol dm–3 / mol dm–3 / mol dm–3 / mol dm–3 s–1
1 1.50 × 10–2 2.50 × 10–2 2.50 × 10–2 2.75 × 10–11
2 1.50 × 10–2 2.50 × 10–2 8.25 × 10–11
3 3.75 × 10–3 5.00 × 10–2 1.00 × 10–1
Complete Table 1.
Use the data from experiment 1 to calculate the rate constant k for this reaction.
Give the units for the rate constant.
[5 marks]
k Units
Question 1 continues on the next page
Turn over ►
*03*
, 4
Do not write
outside the
box
0 1 . 3 Figure 1 shows an incomplete mechanism for this reaction.
Figure 1
Complete the mechanism in Figure 1 by adding four curly arrows and any relevant
lone pair(s) of electrons.
[4 marks]
0 1 . 4 Use evidence from the rate equation to explain why Step 1 is the
rate determining step.
[1 mark]
11
*04*
