O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2015 · Q171 Mark

The energy profile diagram for a reaction is shown. Which statement is correct?

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.

AThe activation energy of the reaction is (H3 – H₁).

BThe activation energy of the reaction is (H3 – H2).

CΔΗ is (H₁ – H2).

DΔΗ is (H₁ – Н3).

✓ Correct answer

A: The activation energy of the reaction is (H3 – H₁).

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2015 Paper 1 Variant 1, question 17.

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