DP Chemistry (first assessment 2025)

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Question 21M.2.HL.TZ2.6b

Date	May 2021	Marks available	[Maximum mark: 2]	Reference code	21M.2.HL.TZ2.6b
Level	HL	Paper	2	Time zone	TZ2
Command term	Determine	Question number	b	Adapted from	N/A

b.

[Maximum mark: 2]

21M.2.HL.TZ2.6b

(b)

Determine the value and unit of the rate constant using the rate expression in (a).

[2]

Markscheme

«k = $\frac{8.0 \times 10^{- 4}}{0.10 \times 0.10 \times {(0.10)}^{2}}$ =» 8.0 ✓

mol⁻³ dm⁹s⁻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.