A-LevelChemistryStates of matterOct/Nov 2016Paper 1 Q81 Mark
In an experiment, a sample of a pure gas is put into a gas syringe at a temperature of 300K and pressure of 16kPa. The gas is compressed until the volume occupied by the gas is halved. After compression, the temperature of the gas in the syringe is 375K and the pressure is 40 kPa. Which statement is correct?
AIntermolecular forces between the gas molecules are significant.
BIt is possible to calculate the number of moles of gas present using these data alone.
CThe gas is behaving ideally.
DThe pressures used are too high for ideal gas behaviour.
✓ Correct Answer
The correct answer is C: The gas is behaving ideally.
📋 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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