A-LevelChemistryReaction kineticsMay/June 2010Paper 1 Q101 Mark

The Haber process for the manufacture of ammonia is represented by the following equation. N2(g) + 3H2(g) ⇌ 2NH3(g) ΔΗ = −92 kJ mol⁻¹ Which statement is correct about this reaction when the temperature is increased?

Q: What topic does this question test?

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

ABoth forward and backward rates increase.

BThe backward rate only increases.

CThe forward rate only increases.

DThere is no effect on the backward or forward rate.

✓ Correct Answer

The correct answer is A: Both forward and backward rates 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 May/June 2010 examination, Paper 1 Variant 2.

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