DP Chemistry (first assessment 2025)

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Question 21N.2.SL.TZ0.c(ii)

Date	November 2021	Marks available	[Maximum mark: 1]	Reference code	21N.2.SL.TZ0.c(ii)
Level	SL	Paper	2	Time zone	TZ0
Command term	State	Question number	c(ii)	Adapted from	N/A

c(ii).

[Maximum mark: 1]

21N.2.SL.TZ0.c(ii)

State the equilibrium constant expression, K_c, for this reaction.

[1]

Markscheme

«K_c =» $\frac{[{PCl}_{5}]}{[{PCl}_{3}] [{Cl}_{2}]}$ ✔

Syllabus sections

Reactivity 2. How much, how fast and how far? » Reactivity 2.3—How far? The extent of chemical change » Reactivity 2.3.2—The equilibrium law describes how the equilibrium constant, K, can be determined from the stoichiometry of a reaction. Deduce the equilibrium constant expression from an equation for a homogeneous reaction.