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A-Level Chemistry Paper 3 Predicted Paper 2023 with marking scheme attached. £20.04
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A-Level Chemistry Paper 3 Predicted Paper 2023 with marking scheme attached.
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A-Level Chemistry Paper 3 Predicted Paper 2023 with marking scheme attached. Name …………………………………………………………………… Date ………………… 2 hours allowed You should have access to the AQA insert (periodic table and data sheet) to help...

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  • May 5, 2023
  • 42
  • 2022/2023
  • Exam (elaborations)
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A level chem ppr3 2023



AQA
A-Level Chemistry Paper 3
Predicted Paper 2023 with marking scheme attached.


Name ……………………………………………………………………
Date …………………


2 hours allowed
You should have access to the AQA insert (periodic table and data sheet)
to help with answering the questions.




Grade boundaries
These are VERY rough guesses! Getting a Possible Marks
Question
marks gained
C on this paper does not guarantee you
1 7
the same mark in the exam.
2 15
3 13
4 14
 A* - 90 5 11
 A – 80 SECTION B 30
 B – 70 Total 90
 C – 60
 D – 50
 E - 40




1

,A level chem ppr3 2023




2

,A level chem ppr3 2023


SECTION A


01
A sample of hydrated K 2SO4 (K2SO4.𝑥H2O) with a mass of 2.458 g was
heated to remove all water of crystallisation. The solid remaining had a
mass of 1.515 g.

(The molar mass of the remaining solid was 174.26 gmol-1)


01.1 Determine a possible formula of the hydrated potassium salt.
Your answer must show relevant working.
[3 marks]




01.2 Suggest how a student doing this experiment could check that all
water had been removed.
[1 mark]




01.3 The entropy change of hydration of K2SO4 is + 225 JK-1mol-1
i) Suggest in terms of the states of the particles involved, why this
entropy change is positive.
[1 mark]



ii) Explain why K2SO4 dissolves in water at 25°C, despite the
enthalpy change of solution being endothermic.

ΔH = +24 kJmol-1
[2 marks]



3

, A level chem ppr3 2023


02
A student wants to investigate the kinetics of the reaction between
hydrogen peroxide and iodide ions in the presence of sulfuric acid.
Rate = [H2O2]x[I-]y



02.1 Write the balanced chemical equation for the reaction between
hydrogen peroxide and iodide ions.
[Include state symbols]

[2 marks]



02.2 The concentration of hydrogen peroxide is measure at different time
intervals while keeping the concentration of iodide and H+ ions
constant. The student could obtain the following results.
t/ 103 s [H2O2]/moldm-
3

0 0.20
2 0.14
4 0.09
6 0.06
8 0.04
10 0.03


i)
Plot the graph of [H2O2]/ moldm-3 against / 103 s

[2 marks]




4

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