Edexcel IGCSEChemistryGeneral Applications11 Marks
This question is about the determination of the formula of a metal oxide. A student heats a known mass of magnesium in a crucible. The student records the mass of the magnesium and the mass of the magnesium oxide formed. [Figure 4 referenced - implicitly, this experiment often uses a crucible and lid, but no diagram is shown in the question paper for Q17 directly, rather the description is given.]
📋 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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