A-LevelChemistryEquilibriaMay/June 2011Paper 1 Q41 Mark

The esterification reaction ethanol + ethanoic acid ⇌ ethyl ethanoate + water is an equilibrium. The forward reaction is exothermic. How can the value of the equilibrium constant Kĉ be increased?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is C: by lowering the temperature.

Q: What topic does this question test?

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

Aby adding a little concentrated sulfuric acid as a catalyst

Bby increasing the initial concentration of ethanol

Cby lowering the temperature

Dby raising the temperature

✓ Correct Answer

The correct answer is C: by lowering the 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 Equilibria in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2011 examination, Paper 1 Variant 2.

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