A-LevelChemistryReaction kineticsFeb/Mar 2021Paper 1 Q111 Mark

The Boltzmann distribution curve for a gaseous mixture of ethene and hydrogen is shown. Nickel is an effective catalyst for the reaction that occurs. [Figure showing Boltzmann distribution curve with Ea (catalysed) and Ea labeled] How does the diagram appear if the same reaction mixture is at a higher temperature?

Q: What topic does this question test?

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

AThe curve is unchanged.

BThe values of both Ea (catalysed) and Ea decrease.

CThe values of both Ea (catalysed) and Ea increase.

DThe values of both Ea (catalysed) and Ea remain the same.

✓ Correct Answer

The correct answer is D: The values of both Ea (catalysed) and Ea remain the same.

📋 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 Feb/Mar 2021 examination, Paper 1 Variant 2.

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