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AQA JUNE 2022 CHEMISTRY AS 7404 PAPER 2 ORGANIC AND PHYSICAL CHEMISTRY
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AQA JUNE 2022 CHEMISTRY AS 7404 PAPER 2 ORGANIC AND PHYSICAL CHEMISTRY
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AQA A LEVEL 2022PAPERS AND
MARKSCHEMES
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I declare this is my own work.
AS
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
For this paper you must have:
• the Periodic Table/Data Sheet, 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 Section B
this book. Write the question number against your answer(s).
• All working must be shown. TOTAL
• Do all rough work in this book. Cross through any work you do not
want to be marked.
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 80.
Advice
You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
*JUN227404201* IB/M/Jun22/E7 7404/2
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 This question is about rates of reaction.
Potassium manganate(VII), KMnO4, reacts with sodium ethanedioate, Na2C2O4, in the
presence of dilute sulfuric acid.
2 MnO4–(aq) + 16 H+(aq) + 5 C2O42–(aq) → 2 Mn2+(aq) + 8 H2O(l) + 10 CO2(g)
The reaction mixture is purple at the start and goes colourless when all the
MnO4–(aq) ions have reacted.
1000
The rate of reaction can be measured as where t = the time taken for the mixture
t
to go colourless.
A student investigated how long it takes for this reaction mixture to go colourless at
different temperatures. The same concentrations and volumes of each reagent were
used in an experiment at each temperature. Table 1 shows the results.
Table 1
Temperature / C 32 38 44 54 67
Time t / s 155 85 50 22 9
1000
6.45 11.8 20.0 45.5
t
0 1 . 1 Complete Table 1.
[1 mark]
0 1 . 2 State the independent variable in this investigation.
[1 mark]
0 1 . 3 The student noticed that the temperature of each reaction mixture decreased during
each experiment.
Suggest how the student calculated the temperature values in Table 1.
[1 mark]
*02*
IB/M/Jun22/7404/2
, 3
Do not write
outside the
1000 box
0 1 . 4 Use the data in Table 1 to plot a graph of against temperature.
t
[3 marks]
0 1 . 5 Use your graph in Question 01.4 to find the time taken for the mixture to go colourless
at 60 °C
Show your working.
[1 mark]
Time t s
Turn over ►
*03*
IB/M/Jun22/7404/2
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