A-LevelChemistryReaction kineticsFeb/Mar 2025Paper 1 Q11 Mark
A Boltzmann distribution for a sample of a reacting gas at a constant temperature is shown. The activation energy, EA, for the reaction is marked. Point × shows the number of particles whose energy is equal to the activation energy. The temperature of the sample of gas is decreased. The shape of the distribution curve changes. Which point could show the number of particles whose energy is the same as the activation energy at the new temperature?
APoint A
BPoint B
CPoint C
DPoint D
✓ Correct Answer
The correct answer is D: Point D
📋 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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