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
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The correct answer is C. This question tests the candidate's understanding of atoms, molecules and stoichiometry within the Chemistrysyllabus. The examiner's mark scheme requires...
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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...
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