DP Chemistry (last assessment 2024)

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Question 22N.1.hl.TZ0.16

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1.hl.TZ0.16
Level hl Paper 1 Time zone TZ0
Command term Identify Question number 16 Adapted from N/A
16.
[Maximum mark: 1]
22N.1.hl.TZ0.16

Which alkane has the lowest standard entropy, S⦵?


A.  CH4 (g)

B.  C2H6 (g)

C.  C3H8 (g)

D.  C4H10 (g)

[1]

Markscheme

A

Examiners report

Only just over half of the candidates were aware that entropy increases with molecular complexity, with the most favoured distractor (D) indicating that many consider the reverse to be the case. This question had a negative discrimination index, showing that top students actually performed worse than their peers.

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