A-LevelChemistryAtoms, molecules and stoichiometryOct/Nov 2025Paper 1 Q371 Mark
In four separate reactions, W, X, Y and Z, 1 mol of an organic compound reacts with an excess of a reagent. [Figure 37: Table of organic compounds and reagents] The volume of any gas produced is collected and measured. All gas volumes are measured at the same temperature and pressure. What is the order of the reactions from greatest total volume of gas collected to least total volume of gas collected?
AW, Y, Z, X
BW, Z, Y, X
CZ, W, X, Y
DZ, X, W, Y
✓ Correct Answer
The correct answer is C: Z, W, X, Y
📋 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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