A-LevelChemistryChemical energetics9701/12 · Oct/Nov 2011 · Q321 Mark

An energy profile diagram is shown. [Figure for energy profile diagram] What do the labels on the diagram represent? 1 W = ΔH of the forward reaction, Y = Ea of the backward reaction 2 Z = ΔH of the backward reaction, Y = Ea of the backward reaction 3 X = ΔH of the forward reaction, W = Ea of the forward reaction

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A1, 2 and 3 are correct

B1 and 2 only are correct

C2 and 3 only are correct

D1 only is correct

✓ Correct answer

C: 2 and 3 only are correct

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2011 Paper 1 Variant 2, question 32.

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