DP Chemistry (last assessment 2024)

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Question 22M.1.hl.TZ2.17

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1.hl.TZ2.17
Level hl Paper 1 Time zone TZ2
Command term Apply Question number 17 Adapted from N/A
17.
[Maximum mark: 1]
22M.1.hl.TZ2.17

Which term in the expression ΔG⦵ = ΔH⦵ − TΔS⦵ is an indirect measure of the entropy change of the surroundings when divided by T?

A.  ΔG⦵

B.  ΔH⦵

C.  ΔS⦵

D.  −TΔS⦵

[1]

Markscheme

B

Examiners report

This challenging question raised some debate and several teachers did not think it was suitable for this level. Most candidates chose -TΔS as “an indirect measure of the entropy change of the surroundings when divided by T”. While candidates are not expected to be familiar with the equation ΔS surroundings = -ΔHsystem/T, they could solve the question by recognizing that ΔH is the value that affects the surroundings while ΔS relates to the system. The wording of the question could have been simplified.

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