A-LevelChemistryStates of matterMay/June 2025Paper 1 Q101 Mark
The average intermolecular forces in water are much stronger than the average intermolecular forces in steam. The average intermolecular forces in ice are slightly stronger than the average intermolecular forces in water. Enthalpy changes are associated with the equilibrium processes shown. H2O(l) ⇌ H2O(g) ΔH⁻ H2O(s) ⇌ H2O(l) ΔHm Which statements are correct? 1 ΔH⁻ and ΔHm are both negative. 2 ΔH⁻ is greater than ΔHm. 3 The intermolecular forces in ice and water are of the same type.
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
✓ Correct Answer
The correct answer is D: 2 and 3 only
📋 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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