A-LevelChemistryEquilibriaMay/June 2018Paper 1 Q51 Mark
The gases X and Y react to form Z. X(g) + Y(g) ⇌ Z(g) An equilibrium mixture of these three gases is compressed at constant temperature. What will be the changes in the mole fraction of Z and in Kp? [Table showing mole fraction of Z and Kp changes]
Aincrease
increase
Bincrease
no change
Cno change
increase
Dno change
no change
✓ Correct Answer
The correct answer is B: increase no change
📋 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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