A-LevelChemistryReaction kinetics9701/12 · Oct/Nov 2025 · 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?
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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
C: Endothermic reaction pathway with two steps, where the second step has a lower activation energy than the first.
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