A-LevelChemistryAtoms, molecules and stoichiometryMay/June 2023Paper 1 Q401 Mark

The diagram shows the relative abundance of different isotopes of lead in a sample of lead ore. The abundance of 208 is half that of 206. The abundances of 208 and 209 are equal. [Figure of bar chart showing % abundance vs Ar for isotopes 206, 207, 208, 209]

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

The correct answer is B: 207.25.

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.

A207.00

B207.25

C207.50

D207.67

✓ Correct Answer

The correct answer is B: 207.25

📋 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 May/June 2023 examination, Paper 1 Variant 2.

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