A-LevelChemistryAtoms, molecules and stoichiometryFeb/Mar 2025Paper 1 Q21 Mark

Crystals of copper(II) nitrate are prepared by adding an excess of malachite to nitric acid. The formula of malachite is Cu(OH)2•CuCO3. (Mr = 221.0) 12.0 g of malachite is added to 30.0 cm³ of 1.50 moldm⁻³ nitric acid. Which mass of malachite is left unreacted when the reaction is complete?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is D: 9.51 g.

Q: What topic does this question test?

This question tests Atoms, molecules and stoichiometry in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

A2.05 g

B2.49 g

C7.03 g

D9.51 g

✓ Correct Answer

The correct answer is D: 9.51 g

📋 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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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Atoms, molecules and stoichiometry in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2025 examination, Paper 1 Variant 2.

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