Under certain conditions, CCl4 and H2O react as shown. The activation energy for the reaction is +62 kJ mol⁻¹. CCl4 + 2H2O → CO2 + 4HCl ΔH = −61.5 kJ mol⁻¹ Which enthalpy profile diagram best fits this reaction?
✓ Correct Answer
The correct answer is D: Diagram showing an endothermic reaction profile with the activation energy barrier above the reactants.
📋 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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