AQA
AS Chemistry
Paper 2 – Organic and Physical Chemistry
Predicted Paper 2023
Name ……………………………………………………………………
Date …………………
1 hour 30 minutes allowed
You should have access to the AQA insert (periodic table and data sheet) to
help with answering the questions.
You should spend around 65 minutes on section A and 25 minutes on section
B.
Possible Marks
Question
marks gained
Grade boundaries
1 7
These are VERY rough guesses! Getting a C 2 5
on this paper does not guarantee you the 3 10
same mark in the exam. 4 6
5 15
6 8
7 8
A – 80
8 6
B – 70
Section B 15
C – 60 Total 80
D – 50
E - 40
1
,hj
2
,hj
SECTION A
01 A chemist carries out an investigation on the equilibrium system
shown below.
2X(g) + Y(g) ⇌ 2Z(g)
This reaction can be carried out so that the position of the equilibrium
is completely on the right-hand side, at a temperature of 500°C and 2
atmosphere pressures in the presence of a V2O5 catalyst.
Then the chemist carries out this reaction at a temperature of 500°C
and 2 atmospheres pressure. He does not use the catalyst.
01.1 Predict the changes, if any to each of the following.
i. Position of the equilibrium.
[1 mark]
ii. Rate of the backward reaction.
[1 mark]
3
, hj
01.2 The chemist mixes together 2.00 × 10-3 mol X(g) and 4.00 × 10-3
mol Y(g) in a 1.00 dm3 container.
At equilibrium, the mixture contains 3.00 × 10-4 mol of X(g).
Calculate the equilibrium constant Kc, including units, if any, for the
equilibrium. Give your answer to three significant figures.
[5 marks]
Kc =
Units =
4
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