A-LevelChemistryReaction kineticsOct/Nov 2020Paper 1 Q111 Mark

Ammonia is made by the Haber process. The reactants are nitrogen and hydrogen. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) ΔH is negative What will increase the rate of the forward reaction?

Q: What topic does this question test?

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

Aadding argon to the mixture but keeping the total volume constant

Bdecreasing the temperature

Cincreasing the total pressure by reducing the total volume at constant temperature

Dremoving ammonia as it is made but keeping the total volume of the mixture the same

✓ Correct Answer

The correct answer is C: increasing the total pressure by reducing the total volume at constant temperature

📋 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 2020 examination, Paper 1 Variant 2.

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