A-LevelChemistryReaction kineticsOct/Nov 2014Paper 1 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
The correct answer is B. This question tests the candidate's understanding of reaction kinetics within the Chemistrysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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