Catalase is an enzyme that breaks down hydrogen peroxide into water and oxygen. Catalase was added to a solution of hydrogen peroxide and the oxygen produced was collected in a gas syringe. The total volume of oxygen produced from the start of the reaction was recorded every 10 seconds for 1 minute. The results are shown in the table. time/s: 0, total volume of oxygen produced/cm³: 0 time/s: 10, total volume of oxygen produced/cm³: 22 time/s: 20, total volume of oxygen produced/cm³: 40 time/s: 30, total volume of oxygen produced/cm³: 50 time/s: 40, total volume of oxygen produced/cm³: 55 time/s: 50, total volume of oxygen produced/cm³: 57 time/s: 60, total volume of oxygen produced/cm³: 58 What can be concluded from these results?
✓ Correct Answer
The correct answer is D: The mean rate of reaction between 20 and 30 seconds was twice the mean rate of reaction between 30 and 40 seconds.
📋 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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