A-LevelChemistryReaction kineticsFeb/Mar 2022Paper 1 Q161 Mark

In the reaction shown, the concentrations of both X and Y are reduced to half of their original values whilst keeping the total volume of the solution constant. X(aq) + Y(aq) → XY(aq) Simultaneously the temperature is increased from 298 K to 348 K. Which prediction is definitely true?

Q: What topic does this question test?

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

Asmaller proportion of collisions between particles of X and particles of Y will be successful.

BThe average kinetic energy of particles of X and particles of Y will increase.

CThe rate of the reaction will be unaffected.

DThe frequency of collisions between particles of X and particles of Y will halve.

✓ Correct Answer

The correct answer is B: The average kinetic energy of particles of X and particles of Y will increase.

📋 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 2022 examination, Paper 1 Variant 2.

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