Exam (elaborations)
AQA MERGED QUESTION PAPER AND MARK SCHEME PAPER 2-7405/2 ORGANIC AND PHYSICAL CHEMISTRY FOR JUNE 2024
AQA MERGED QUESTION PAPER AND MARK SCHEME PAPER 2-7405/2 ORGANIC AND PHYSICAL CHEMISTRY FOR JUNE 2024
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A-levelCHEMISTRY
Paper 2 Organic and Physical Chemistry
Tuesday 18 June 2024 Morning Time allowed: 2 hours
For Examiner’s Use
Question Mark
1
2
3
4
5
6
7
8
9
10
11
TOTAL
7405/2
, 2
Answer all questions in the spaces provided.
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]
, 3
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 ►
, 4
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*
IB/M/Jun24/7405/2
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