A-LevelChemistryChemical energetics9701/12 · May/June 2020 · Q321 Mark

Which reactions would have the reaction profile shown? [Diagram showing an energy profile, starting high, going through a transition state, and ending lower, indicating an exothermic reaction.] 1 NaOH + HCl → NaCl + H2O 2 CaCO3 → CaO + CO2 3 2MgO → 2Mg + O2

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

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, May/June 2020 Paper 1 Variant 2, question 32.

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