A-LevelChemistryReaction kineticsOct/Nov 2024Paper 1 Q161 Mark
The Boltzmann distribution for a mixture of gases capable of reaction is shown. The two curves represent the mixture of gases at 25°C and at 35°C. The activation energies for the catalysed and uncatalysed reactions are shown. [Figure showing Boltzmann distribution curves with Ea catalysed, Ea uncatalysed, and shaded regions w, x, y, z] Which row is correct?
Aw+x+y+z z
Bw+x+y+z x+z
Cy + z z
Dy + z x+z
✓ Correct Answer
The correct answer is D: y + z x+z
📋 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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