A-LevelChemistryChemical energetics9701/12 · Feb/Mar 2016 · 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?

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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.

✓ Correct answer

D: Exothermic reaction pathway diagram with a small activation energy.

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2016 Paper 1 Variant 2, question 5.

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