A-LevelChemistryReaction kineticsOct/Nov 2023Paper 5 Q218 Marks
Benzenediazonium chloride, C6H5N2Cl, decomposes in water as shown in the following equation. C6H5N2Cl(aq) + H2O(l) → C6H5OH(aq) + N2(g) + HCl(aq) A solution of 0.0750moldm¬³ of C6H5N2Cl(aq) decomposes at a constant temperature of 50°C. The volume of nitrogen gas, N2(g), collected is recorded every 5 minutes for 45 minutes.
📋 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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