O-LevelChemistryRates of Reaction5070/12 · Oct/Nov 2019 · Q131 Mark

Two energy profile diagrams are shown. The scale on the y-axis is the same for both diagrams. Which statement is correct?

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ABoth reactions are exothermic.

BOnly one reaction is endothermic.

CThe activation energy of reaction 1 is smaller than the activation energy of reaction 2.

DThe enthalpy change of reaction 2 is larger than the enthalpy change of reaction 1.

✓ Correct answer

D: The enthalpy change of reaction 2 is larger than the enthalpy change of reaction 1.

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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 2, question 13.

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