A-LevelChemistryAtoms, molecules and stoichiometryFeb/Mar 2019Paper 3 Q110 Marks
Several ores of copper contain both copper(II) carbonate and copper(II) hydroxide. This combination is called basic copper(II) carbonate. You will determine the composition of an ore of copper by reacting it with an excess of acid and collecting the gas evolved. CuCO3(s) + H₂SO₄(aq) → CuSO4(aq) + H2O(l) + CO2(g) FA 1 is a sample of basic copper(II) carbonate. FA 2 is dilute sulfuric acid, H2SO4. The formula of basic copper(II) carbonate, FA 1, can be written as xCuCO3•yCu(OH)2. You will use your results to determine the ratio x: y in the formula.
📋 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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