A-LevelChemistryReaction kinetics9701/12 · Feb/Mar 2021 · Q111 Mark

The Boltzmann distribution curve for a gaseous mixture of ethene and hydrogen is shown. Nickel is an effective catalyst for the reaction that occurs. [Figure showing Boltzmann distribution curve with Ea (catalysed) and Ea labeled] How does the diagram appear if the same reaction mixture is at a higher temperature?

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 curve is unchanged.

BThe values of both Ea (catalysed) and Ea decrease.

CThe values of both Ea (catalysed) and Ea increase.

DThe values of both Ea (catalysed) and Ea remain the same.

✓ Correct answer

D: The values of both Ea (catalysed) and Ea remain the same.

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2021 Paper 1 Variant 2, question 11.

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