A-LevelChemistryReaction kinetics9701/12 · May/June 2015 · Q111 Mark

The Boltzmann distribution below shows the distribution of molecular energies in a sample of a gas at a given temperature. [Figure] Which statement correctly describes the change in such a distribution if the temperature is increased?

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AFewer molecules possess the most probable energy value and this value shifts to the left.

BFewer molecules possess the most probable energy value and this value shifts to the right.

CMore molecules possess the most probable energy value and this value shifts to the left.

DThe area under the curve of the distribution increases.

✓ Correct answer

B: Fewer molecules possess the most probable energy value and this value shifts to the right.

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2015 Paper 1 Variant 2, question 11.

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