A-LevelChemistryReaction kinetics9701/12 · May/June 2014 · Q11 Mark

The diagram shows a Boltzmann distribution of molecular energies for a gaseous mixture. The distribution has a peak, labelled P on the diagram. [Figure 1.1] What happens when the temperature of the mixture increases?

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AThe height of the peak, P, decreases and the activation energy moves to the left.

BThe height of the peak, P, decreases and the activation energy moves to the right.

CThe height of the peak, P, decreases and the activation energy does not change.

DThe height of the peak, P, increases and the activation energy moves to the left.

✓ Correct answer

C: The height of the peak, P, decreases and the activation energy does not change.

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2014 Paper 1 Variant 2, question 1.

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