A-LevelChemistryReaction kineticsOct/Nov 2013Paper 1 Q51 Mark
An autocatalytic reaction is a reaction in which one of the products catalyses the reaction. Which curve was obtained if the rate of reaction was plotted against time for an autocatalytic reaction?
AGraph showing rate starting at zero, increasing, then levelling off.
BGraph showing rate starting at zero, increasing, then decreasing to a non-zero constant rate.
CGraph showing rate starting at zero, increasing to a maximum, then decreasing towards zero.
DGraph showing rate starting at a high value, decreasing, then levelling off at a non-zero constant rate.
✓ 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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