A-LevelChemistryChemical energeticsMay/June 2012Paper 1 Q121 Mark

Red lead oxide, Pb3O4, is used in metal priming paints. It can be made by heating PbO in air. 6PbO(s) + O2(g) → 2Pb3O4(s) Which two values are needed to calculate the enthalpy change for this reaction?

Q: What topic does this question test?

This question tests Chemical energetics in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Aenthalpy change of atomisation of O2 and enthalpy change of formation of Pb3O4

Benthalpy change of formation of O2 and enthalpy change of formation of Pb3O4

Centhalpy change of formation of PbO and enthalpy change of atomisation of O2

Denthalpy change of formation of PbO and enthalpy change of formation of Pb3O4

✓ Correct Answer

The correct answer is D: enthalpy change of formation of PbO and enthalpy change of formation of Pb3O4

📋 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 Chemical energetics in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2012 examination, Paper 1 Variant 2.

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