A-LevelChemistryReaction kinetics9701/12 · May/June 2012 · Q11 Mark

The molecular energy distribution curve represents the variation in energy of the molecules of a gas at room temperature. [Figure 1.1] Which curve applies for the same gas at a lower temperature?

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A[Diagram of distribution curve: peak is higher and slightly shifted left, narrower]

B[Diagram of distribution curve: peak is lower and shifted left, wider]

C[Diagram of distribution curve: peak is highest and shifted furthest left, narrowest]

D[Diagram of distribution curve: peak is shifted right and lower, wider]

✓ Correct answer

C: [Diagram of distribution curve: peak is highest and shifted furthest left, narrowest]

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2012 Paper 1 Variant 2, question 1.

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