A-LevelChemistryStates of matterOct/Nov 2017Paper 1 Q51 Mark

A sample of an ideal gas is contained at a constant temperature of 300 K in a gas syringe. The pressure is increased and a graph of pV/RT against pressure is plotted. Which graph correctly represents the results?

Q: What topic does this question test?

This question tests States of matter in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

A[Graph A: pV/RT starts high, decreases, then increases linearly with p, crossing C and B]

B[Graph B: pV/RT starts low, decreases slightly, then increases linearly with p, below A]

C[Graph C: pV/RT is a horizontal line at 1, for all p]

D[Graph D: pV/RT decreases non-linearly with p]

✓ Correct Answer

The correct answer is C: [Graph C: pV/RT is a horizontal line at 1, for all p]

📋 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 States of matter in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2017 examination, Paper 1 Variant 2.

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