DP Chemistry (first assessment 2025)

Question 22M.1A.HL.TZ1.18

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.1A.HL.TZ1.18
Level	HL	Paper	1A	Time zone	TZ1
Command term	Determine	Question number	18	Adapted from	N/A

18.

[Maximum mark: 1]

22M.1A.HL.TZ1.18

$\frac{1}{2}$ Cl₂(g) + $\frac{1}{2} I_{2}$ (g) $⇌$ $I$ Cl (g) K_c = 454

What is the K_c value for the reaction below?

2 $I$ Cl (g) $⇌$ Cl₂(g) + $I_{2}$ (g)

A. $2 \times 454$

B. $\frac{1}{2 \times 454}$

C. $454^{2}$

D. $\frac{1}{454^{2}}$

[1]

Markscheme

Examiners report

Question 18 was identified as being mathematically challenging. However, as all answers were shown as calculations rather than as final answers, this does not seem a reasonable complaint.

Syllabus sections

Reactivity 2. How much, how fast and how far? » Reactivity 2.3—How far? The extent of chemical change » Reactivity 2.3.6—The equilibrium law is the basis for quantifying the composition of an equilibrium mixture. Solve problems involving values of K and initial and equilibrium concentrations of the components of an equilibrium mixture.

Question 22M.1A.HL.TZ1.18

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