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A-LevelChemistryReaction kineticsMay/June 2021Paper 4 Q59 Marks

Dinitrogen pentoxide, N2O5, is dissolved in an inert solvent (solv) and the rate of decomposition of N2O5 is investigated. This reaction produces nitrogen dioxide, which remains in solution, and oxygen gas. N₂O₅(solv) → 2NO₂(solv) + ½O₂(g)

Q: What topic does this question test?

This question tests Reaction kinetics in A-Level Chemistry (syllabus code 9701). It is worth 9 marks.

📋 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 structured question tests Reaction kinetics in A-Level Chemistry (syllabus code 9701). It is worth 9 marks.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2021 examination, Paper 4 Variant 3.

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