DP Chemistry (first assessment 2025)

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Question 21M.1A.SL.TZ1.18

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.SL.TZ1.18
Level	SL	Paper	1A	Time zone	TZ1
Command term	Predict	Question number	18	Adapted from	N/A

18.

[Maximum mark: 1]

21M.1A.SL.TZ1.18

Which changes produce the greatest increase in the percentage conversion of methane?

CH₄(g) + H₂O (g) $⇌$ CO (g) + 3H₂(g)

[1]

Markscheme

C

Syllabus sections

Reactivity 2. How much, how fast and how far? » Reactivity 2.3—How far? The extent of chemical change » Reactivity 2.3.4—Le Châtelier’s principle enables the prediction of the qualitative effects of changes in concentration, temperature and pressure to a system at equilibrium. Apply Le Ch.telier’s principle to predict and explain responses to changes of systems at equilibrium.