A-LevelChemistryAtoms, molecules and stoichiometryFeb/Mar 2023Paper 1 Q371 Mark
An aqueous solution contains 4.00 g of a carboxylic acid, Q. When this solution reacts with an excess of magnesium, 380 cm³ of gas is produced, measured at s.t.p. What is the relative formula mass of Q?
A59
B118
C126
D236
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The correct answer is B. 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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