A-LevelChemistryReaction kineticsOct/Nov 2010Paper 1 Q341 Mark
A student puts 10 cm³ of 0.100 mol dm⁻³ sulfuric acid into one test-tube and 10 cm³ of 0.100 mol dm⁻³ ethanoic acid into another test-tube. He then adds 1.0 g (an excess) of magnesium ribbon to each test-tube and takes suitable measurements. Both acids have the same starting temperature. Neither reaction is complete after 2 minutes, but both are complete after 20 minutes. Which statements are correct? 1 After 2 minutes, the sulfuric acid is at a higher temperature than the ethanoic acid. 2 After 2 minutes, the sulfuric acid has produced more gas than the ethanoic acid. 3 After 20 minutes, the sulfuric acid has produced more gas than the ethanoic acid.
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 A: 1, 2 and 3 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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