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A-LevelChemistryChemical periodicityMay/June 2021Paper 2 Q311 Marks

Separate samples of R, S, T and U are added to cold water. The identity of each sample is unknown. However, each sample is known to be pure and can only be one of Ba(OH)2, NaCl, P4O10 or SiCl4. [Table with state at room temperature, observations on addition of sample to water]

Q: What topic does this question test?

This question tests Chemical periodicity in A-Level Chemistry (syllabus code 9701). It is worth 11 marks.

📋 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 structured question tests Chemical periodicity in A-Level Chemistry (syllabus code 9701). It is worth 11 marks.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2021 examination, Paper 2 Variant 3.

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