O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2010 · Q131 Mark

The energy profile for the forward direction of a reversible reaction is shown. Which row correctly shows the sign of both the activation energy and the type of the enthalpy change for the reverse reaction? sign of activation type of enthalpy energy change A negative endothermic B negative exothermic C positive endothermic D positive exothermic

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Anegative endothermic

Bnegative exothermic

Cpositive endothermic

Dpositive exothermic

✓ Correct answer

D: positive exothermic

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2010 Paper 1 Variant 1, question 13.

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