DP Chemistry (last assessment 2024)

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Question 22N.2.sl.TZ0.2e.iii

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.sl.TZ0.2e.iii
Level sl Paper 2 Time zone TZ0
Command term Annotate Question number e.iii Adapted from N/A
e.iii.
[Maximum mark: 1]
22N.2.sl.TZ0.2e.iii

Chloroquine is a medication used to prevent and treat malaria.

Chloroquine can be synthesized by reacting 4,7-dichloroquinoline with another reactant, B.

            4,7-dichloroquinoline                                                            chloroquine

(e.iii)

Annotate the Maxwell–Boltzmann distribution curve showing the activation energies, Ea, for the catalysed and uncatalysed reactions.

[1]

Markscheme

both Ea values marked AND left one labelled catalysed ✔

Examiners report

This question discriminated well between high-scoring and low-scoring candidates. Half the candidates annotated the Maxwell-Boltzmann distribution curve to show the activation energies for the uncatalysed and catalysed reactions. Mistakes included drawing a second curve (confusing this effect with changing temperature), reversing the labels and labelling other parts of the graph.

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