A-LevelChemistryReaction kineticsFeb/Mar 2023Paper 1 Q31 Mark
A student carries out four experiments to investigate the rate of reaction between 3.0 g of calcium carbonate and hydrochloric acid. CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l) experiment 1 CaCO3 powder + 2.0 mol dm⁻³ HCl at 35 °C experiment 2 CaCO3 powder + 2.0 mol dm⁻³ HCl at 35 °C experiment 3 large chips of CaCO3 + 1.0 mol dm⁻³ HCl at room temperature experiment 4 large chips of CaCO3 + 1.0 mol dm⁻³ HCl at 35 °C The student collects the CO2(g) and times how long it takes to produce the same volume of gas for each experiment. What could be the correct times for the four experiments? [Table with columns "experiment 1 /s", "experiment 2 /s", "experiment 3 /s", "experiment 4 /s"]
A5, 10, 30, 95
B5, 10, 95, 30
C5, 30, 95, 10
D95, 30, 10, 5
✓ Correct Answer
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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