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?
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. This question tests the candidate's understanding of states of matter within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
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