A-LevelChemistryReaction kineticsOct/Nov 2025Paper 1 Q141 Mark
20.0 cm³ of hydrogen peroxide decomposes to water and oxygen in the presence of a suitable catalyst. 160 cm³ of oxygen, measured at room conditions, is produced in 5.00 minutes. What is the average rate of decomposition of hydrogen peroxide during this reaction period?
A2.22 x 10⁻⁵ mol s⁻¹
B4.44 × 10⁻⁵ mol s⁻¹
C1.76 x 10⁻⁴ mol s⁻¹
D2.67 x 10⁻³ mol s⁻¹
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The correct answer is B. This question tests the candidate's understanding of reaction kinetics within the Chemistrysyllabus. The examiner's mark scheme requires...
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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...
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