Two chemicals, X and Y, react together in solution to give product Z. The rate of formation of product Z at the start of the reaction was measured in five experiments, 1–5, using various concentrations of X and Y. The results are shown. experiment number starting concentration of X / mol dm⁻³ starting concentration of Y / mol dm⁻³ rate of formation of Z at the start / mol dm⁻³ s⁻¹ 1 0.10 0.10 0.0001 2 0.10 0.20 0.0004 3 0.10 0.40 0.0016 4 0.20 0.10 0.0001 5 0.40 0.10 0.0001 Which statement is correct?
✓ Correct Answer
The correct answer is C: The rate of the reaction is not affected by the concentration of reagent X.
📋 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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