A-Level Chemistry
AQA
Paper 2 – Organic and Physical Chemistry
Predicted Paper 2023
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 C Possible Marks
Question
marks gained
on this paper does not guarantee you the
1 9
same mark in the exam.
2 6
3 4
4 10
A* - 90 5 6
A – 80 6 13
B – 70 7 20
C – 60 8 8
D – 50 9 5
E - 40 10 11
11 13
Total 105
,d
,d
01 Esters have many important commercial uses such as solvents and
artificial flavorings in food.
A mixture was prepared using 2.00 mol of CH3COOH, 3.00 mol of
methanol and 7.00 mol of water.
The mixture was left to reach equilibrium according to the following
equation at T1.
CH3COOH + CH3OH ⇌ CH3COOCH3+ H2O ΔH = -50 kJ/mol
The equilibrium mixture contains 0.85 moles of the ester.
01.1
Write an expression for the equilibrium constant Kc for this
reaction.
[1 mark]
01.2
Calculate the value of Kc.
Explain why this Kc value has no units.
[4 marks]
, d
01.3
The equilibrium mixture was allowed to reach the equilibrium at
a higher temperature, T2 without changing the volume of the
container.
State whether the value of Kc will increase, decrease or stay the
same.
Explain your answer.
[4 marks]
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