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Date	May 2017	Marks available	1	Reference code	17M.1.sl.TZ1.14
Level	SL	Paper	1	Time zone	TZ1
Command term	Derive	Question number	14	Adapted from	N/A

Question

Which expression gives the enthalpy change, ΔH, for the thermal decomposition of calcium carbonate?

A. ΔH = ΔH₁ − ΔH₂

B. ΔH = 2ΔH₁ − ΔH₂

C. ΔH = ΔH₁ − 2ΔH₂

D. ΔH = ΔH₁ + ΔH₂

Markscheme

A

Examiners report

[N/A]

Syllabus sections

Core » Topic 5: Energetics/thermochemistry » 5.2 Hess’s Law

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