O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2019 · Q131 Mark

An energy profile diagram is shown. What does the arrow R on the diagram represent?

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.

Aan endothermic energy change

Bthe activation energy

Cthe energy taken in by the reactants

Dthe enthalpy change of the reaction

✓ Correct answer

D: the enthalpy change of the reaction

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2019 Paper 1 Variant 1, question 13.

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