Exam (elaborations)
aqa as level chemistry paper 2
aqa as level chemistry paper 2
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Please write clearly in block capitals.Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
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AS
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CHEMISTRY
Paper 2 Organic and Physical Chemistry ah
am
Time allowed: 1 hour 30 minutes
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Materials For Examiner’s Use
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For this paper you must have:
• the Periodic Table/Data Sheet, provided as an insert (enclosed) Question Mark
• a ruler with millimetre measurements 1
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• a scientific calculator, which you are expected to use where appropriate.
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Instructions
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• Use black ink or black ball-point pen. 4
• Fill in the boxes at the top of this page.
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• 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.
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The rate of reaction can be measured as where t = the time taken for the mixture
t
1
to go colourless.
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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
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used in an experiment at each temperature. Table 1 shows the results.
Table 1
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Temperature / C 32 38 44 54 67
Time t / s 155 85 50 22 9
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6.45 11.8 20.0 45.5
t
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0 1 . 1 Complete Table 1.
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[1 mark]
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0 1 . 2 State the independent variable in this investigation.
[1 mark]
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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
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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]
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0 1 . 5 Use your graph in Question 01.4 to find the time taken for the mixture to go colourless
at 60 °C
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Show your working.
[1 mark]
Time t s
Turn over ►
*03*
IB/M/Jun22/7404/2
, 4
Do not write
outside the
0 1 . 6 The investigation shows that increasing the temperature causes the rate of reaction to box
increase.
Explain why a small increase in temperature causes a large increase in the rate of
reaction.
[2 marks]
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9
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*04*
IB/M/Jun22/7404/2
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