DP Chemistry (first assessment 2025)

Question 20N.1A.SL.TZ0.18

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.SL.TZ0.18
Level	SL	Paper	1A	Time zone	TZ0
Command term	Identify	Question number	18	Adapted from	N/A

18.

[Maximum mark: 1]

20N.1A.SL.TZ0.18

What is correct when temperature increases in this reaction at equilibrium?

$2 NOCl (g) ⇌ 2 NO (g) + {Cl}_{2} (g)$ $∆ H^{⦵} = + 75.5 kJ$

[1]

Markscheme

Examiners report

A good majority of candidates understood how position of equilibrium and rate constant of an endothermic reaction are affected by temperature increase.

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.

Question 20N.1A.SL.TZ0.18

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