A-LevelChemistryReaction kinetics9701/12 · May/June 2023 · Q161 Mark

The diagram shows the Boltzmann distribution of energies in a gas. The gas can take part in a reaction with an activation energy, Ea. The gas is maintained at a constant temperature. [Figure of Boltzmann distribution curve]

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AIf a catalyst is added, peak P will be lower and Ea will move to the left.

BIf a catalyst is added, peak P will be lower and Ea will move to the right.

CIf a catalyst is added, peak P will be the same and Ea will move to the left.

DIf a catalyst is added, peak P will be the same and Ea will move to the right.

✓ Correct answer

C: If a catalyst is added, peak P will be the same and Ea will move to the left.

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2023 Paper 1 Variant 2, question 16.

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