A-LevelChemistryReaction kineticsOct/Nov 2009Paper 1 Q91 Mark

Four reactions of the type shown are studied at the same temperature. X(g) + Y(g) → Z(g) Which is the correct reaction pathway diagram for the reaction that would proceed most rapidly and with the highest yield?

Q: What topic does this question test?

This question tests Reaction kinetics in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

AReaction pathway diagram with low activation energy and a large energy drop from reactants to products.

BReaction pathway diagram with high activation energy and a large energy drop from reactants to products.

CReaction pathway diagram with low activation energy and a moderate energy drop from reactants to products.

DReaction pathway diagram with high activation energy and a moderate energy drop from reactants to products.

✓ Correct Answer

The correct answer is C: Reaction pathway diagram with low activation energy and a moderate energy drop from reactants to products.

📋 Examiner Report & Trap Analysis

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...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Reaction kinetics in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2009 examination, Paper 1 Variant 2.

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