A-LevelChemistryReaction kinetics9701/12 · May/June 2024 · Q151 Mark

Gas Q decomposes slowly at room temperature. Q(g) → X(g) + Z(g) The Boltzmann distribution curve for gas Q at room temperature is shown. [Figure 15.1] Which change occurs when a catalyst is added to gas Q?

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 peak of the curve moves to the right on the diagram.

BThe number of particles with enough energy to decompose increases.

CThe kinetic energy of the unreacted particles increases.

DThe value of Ea decreases, moving the vertical dotted line to the right on the diagram.

✓ Correct answer

B: The number of particles with enough energy to decompose increases.

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2024 Paper 1 Variant 2, question 15.

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