A-LevelChemistryReaction kineticsMay/June 2024Paper 1 Q151 Mark

Gas Q decomposes slowly at room temperature. Q(g) → X(g) + Z(g) The Boltzmann distribution curve for gas Q at room temperature is shown. [Figure 15.1] Which change occurs when a catalyst is added to gas Q?

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 peak of the curve moves to the right on the diagram.

BThe number of particles with enough energy to decompose increases.

CThe kinetic energy of the unreacted particles increases.

DThe value of Ea decreases, moving the vertical dotted line to the right on the diagram.

✓ Correct Answer

The correct answer is B: The number of particles with enough energy to decompose increases.

📋 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 May/June 2024 examination, Paper 1 Variant 2.

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