A-LevelChemistryReaction kineticsOct/Nov 2022Paper 1 Q111 Mark
The Haber process is carried out with a nitrogen partial pressure of 50 kPa, a hydrogen partial pressure of 150 kPa, a temperature of 400 °C and an iron catalyst. N2(g) + 3H2(g) ⇌ 2NH3(g) If all other conditions are kept the same, which change will result in a raised activation energy?
ABoth the nitrogen and hydrogen partial pressures are changed to 100 kPa.
BThe iron is removed.
CThe nitrogen partial pressure is increased to 150 kPa.
DThe temperature is increased to 500 °C.
✓ Correct Answer
The correct answer is B: The iron is removed.
📋 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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