DP Chemistry (first assessment 2025)

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Question 22M.2.HL.TZ2.a(iii)

Date	May 2022	Marks available	[Maximum mark: 2]	Reference code	22M.2.HL.TZ2.a(iii)
Level	HL	Paper	2	Time zone	TZ2
Command term	Calculate	Question number	a(iii)	Adapted from	N/A

a(iii).

[Maximum mark: 2]

22M.2.HL.TZ2.a(iii)

Calculate the value of the rate constant stating its units.

[2]

Markscheme

$k = « \frac{1.2 \times 10^{- 6} mol {dm}^{- 3} s^{- 1}}{2.0 \times 10^{- 3} mol {dm}^{- 3} \times 3.0 \times 10^{- 3} mol {dm}^{- 3}} = » 0.20$ ✔

mol^–1 dm³ s^–1 ✔

Syllabus sections

Reactivity 2. How much, how fast and how far? » Reactivity 2.2—How fast? The rate of chemical change » Reactivity 2.2.11—The rate constant, k, is temperature dependent and its units are determined from the overall order of the reaction. Solve problems involving the rate equation, including the units of k.