A-LevelChemistryAnalytical techniquesMay/June 2017Paper 3 Q214 Marks
Malachite is a basic form of copper carbonate in which copper hydroxide is also present. The accepted chemical formula of malachite is CuCO3.Cu(OH)2.H2O. When malachite is heated, it decomposes as shown. CuCO3.Cu(OH)2.H2O(s) → 2CuO(s) + CO2(g) + 2H2O(g) In this experiment, you will heat malachite to decompose it and use your results to obtain evidence about the accepted formula of malachite. FA 5 is malachite, CuCO3.Cu(OH)2.H2O.
📋 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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