DP Chemistry (first assessment 2025)

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Question 22M.1A.HL.TZ1.14

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.1A.HL.TZ1.14
Level	HL	Paper	1A	Time zone	TZ1
Command term	Solve	Question number	14	Adapted from	N/A

14.

[Maximum mark: 1]

22M.1A.HL.TZ1.14

What is the enthalpy change of the following reaction?

CH₂CHCH₂CH₃ + HBr → CH₃CHBrCH₂CH₃

A. –119.6 kJ

B. +119.6 kJ

C. –119.8 kJ

D. +119.8 kJ

[1]

Markscheme

C

Syllabus sections

Reactivity 1. What drives chemical reactions? » Reactivity 1.2—Energy cycles in reactions » Reactivity 1.2.4—An application of Hess’s law uses enthalpy of formation data or enthalpy of combustion data to calculate the enthalpy change of a reaction. Calculate enthalpy changes of a reaction using ΔHf⦵ data or ΔHc⦵ data: ΔH⦵ = Σ ΔHf⦵products − Σ ΔHf⦵reactants ΔH⦵ = Σ ΔHc, ⦵reactants − Σ ΔHc. ⦵products