A-LevelChemistryStates of matterOct/Nov 2014Paper 1 Q41 Mark
Two glass vessels M and N are connected by a closed valve. [Figure: Diagram showing two connected vessels M and N, separated by a valve.] M contains helium at 20°C at a pressure of 1 × 10⁵ Pa. N has been evacuated, and has three times the volume of M. In an experiment, the valve is opened and the temperature of the whole apparatus is raised to 100°C. What is the final pressure in the system?
A3.18 × 10⁴ Pa
B4.24 × 10⁴ Pa
C1.25 × 10⁵ Pa
D5.09 × 10⁵ Pa
✓ Correct Answer
The correct answer is A: 3.18 × 10⁴ Pa
📋 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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