DP Chemistry (first assessment 2025)

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Question 19M.1A.HL.TZ1.21

Date	May 2019	Marks available	[Maximum mark: 1]	Reference code	19M.1A.HL.TZ1.21
Level	HL	Paper	1A	Time zone	TZ1
Command term		Question number	21	Adapted from	N/A

21.

[Maximum mark: 1]

19M.1A.HL.TZ1.21

Which is correct for the reaction mechanism shown?

[1]

Markscheme

D

Examiners report

Another well answered question on rate mechanisms.

Syllabus sections

Reactivity 2. How much, how fast and how far? » Reactivity 2.2—How fast? The rate of chemical change » Reactivity 2.2.6—Many reactions occur in a series of elementary steps. The slowest step determines the rate of the reaction. Evaluate proposed reaction mechanisms and recognize reaction intermediates. Distinguish between intermediates and transition states, and recognize both in energy profiles of reactions.