A-LevelChemistryChemical energeticsMay/June 2022Paper 1 Q101 Mark
Separate samples of 25.0 cm³ of 0.1 mol dm⁻³ NaOH(aq) are added to each of three different acid solutions, as described. The temperature of each of the solutions was 298 K before mixing. Which statement describes the temperature rises that occur on mixing each of these three acids separately with NaOH?
AThe temperature rise in all three mixtures is the same.
BThe temperature rise using H₂SO₄ and HCl is the same.
CThe temperature rise using CH₃CO₂H is greater than using HCl.
DThe greatest temperature rise occurs using H₂SO₄.
✓ Correct Answer
The correct answer is D: The greatest temperature rise occurs using H₂SO₄.
📋 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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