A-LevelChemistryReaction kineticsOct/Nov 2025Paper 1 Q151 Mark
Which reaction pathway diagram shows an endothermic reaction that occurs in two steps and in which the second step of the reaction is likely to be faster than the first?
AEndothermic reaction pathway with two steps, where the second step has a higher activation energy than the first.
BExothermic reaction pathway with two steps, where the second step has a lower activation energy than the first.
CEndothermic reaction pathway with two steps, where the second step has a lower activation energy than the first.
DExothermic reaction pathway with two steps, where the second step has a higher activation energy than the first.
✓ Correct Answer
The correct answer is C. 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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