A-LevelChemistryReaction kinetics9701/12 · Oct/Nov 2014 · Q351 Mark

On being heated, hydrogen iodide breaks down more quickly than hydrogen chloride. Which statements explain this faster rate? 1 The HI bond is weaker than the HCl bond. 2 The reaction of the breakdown of HI has a smaller activation energy than that of HCl. 3 The breakdown of HI is more exothermic than that of HCl.

A1, 2 and 3 are correct

B1 and 2 only are correct

C2 and 3 only are correct

D1 only is correct

✓ Correct answer

B: 1 and 2 only are correct

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2014 Paper 1 Variant 2, question 35.

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