DP Chemistry (first assessment 2025)

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Question 22M.2.SL.TZ1.3a(i)

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.2.SL.TZ1.3a(i)
Level	SL	Paper	2	Time zone	TZ1
Command term	Deduce	Question number	a(i)	Adapted from	N/A

a(i).

[Maximum mark: 1]

22M.2.SL.TZ1.3a(i)

(a(i))

Deduce the expression for the equilibrium constant, K_c, for this equation.

[1]

Markscheme

$K_{c} = \frac{{[N H_{3}]}^{2}}{[N_{2}] {[H_{2}]}^{3}}$ ✔

Examiners report

Deducing the equilibrium constant expression for the given equation was done very well.

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.