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O-LevelChemistryRates of Reaction5070/12 · May/June 2018 · Q161 Mark

A reaction is exothermic. Which diagram shows the correct energy profile diagram for the reaction and the correct enthalpy change?

Diagram for this question, from the exam paper

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A[Energy profile diagram A with positive ΔH]
B[Energy profile diagram B with negative ΔH]
C[Energy profile diagram C with positive ΔH]
D[Energy profile diagram D with negative ΔH]

✓ Correct answer

D: [Energy profile diagram D with negative ΔH]

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About this question

Topic
Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source
O-Level Chemistry, May/June 2018 Paper 1 Variant 2, question 16.

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