A-LevelChemistryChemical energeticsFeb/Mar 2016Paper 1 Q51 Mark
Nitric oxide, NO, and bromine vapour react together according to the following equation. 2NO(g) + Br₂(g) → 2NOBr(g) ΔH = -23 kJ mol⁻¹ The reaction has an activation energy of +5.4 kJ mol⁻¹. What is the correct reaction pathway diagram for this reaction?
AExothermic reaction pathway diagram with a large activation energy.
BExothermic reaction pathway diagram with a large activation energy.
CExothermic reaction pathway diagram with a small activation energy.
DExothermic reaction pathway diagram with a small activation energy.
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The correct answer is D. This question tests the candidate's understanding of chemical energetics 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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