A-LevelChemistryAtoms, molecules and stoichiometryMay/June 2022Paper 5 Q114 Marks
A student plans an investigation to find the molar ratio of the reaction between sodium chloride, NaCl, and a lead compound. The student is provided with solid NaCl and 0.200 mol dm⁻³ aqueous lead compound. The reaction between NaCl(aq) and the aqueous lead compound produces an insoluble compound as a precipitate.
📋 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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