A-LevelChemistryReaction kineticsOct/Nov 2009Paper 1 Q331 Mark
Why does a mixture of hydrogen gas and bromine gas react together faster at a temperature of 500 K than it does at a temperature of 400 K? 1 A higher proportion of effective collisions occurs at 500 K. 2 Hydrogen molecules and bromine molecules collide more frequently at 500 K. 3 The activation energy of the reaction is lower at 500 Κ.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct Answer
The correct answer is B: 1 and 2 only are correct
📋 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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