DP Chemistry (last assessment 2024)

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Question 22M.2.hl.TZ2.b(ii)

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.hl.TZ2.b(ii)
Level hl Paper 2 Time zone TZ2
Command term Explain Question number b(ii) Adapted from N/A
b(ii).
[Maximum mark: 2]
22M.2.hl.TZ2.b(ii)

Sulfur trioxide is produced from sulfur dioxide.

2SO2 (g) + O2 (g) ⇌ 2SO3 (g)          ΔH = −196 kJ mol−1

The reaction between sulfur dioxide and oxygen can be carried out at different temperatures.

Explain the effect of increasing temperature on the yield of SO3.

[2]

Markscheme

decrease AND equilibrium shifts left / favours reverse reaction ✔

«forward reaction is» exothermic / ΔH is negative ✔

Examiners report

Many candidates got one mark at least, sometimes failing to state the effect on the production of SO3 though they knew this quite obviously. This failure to read the question properly also resulted in an incorrect prediction based exclusively on kinetics instead of using the information provided to guide their answers.

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