A-LevelChemistryReaction kineticsMay/June 2023Paper 1 Q151 Mark
The equations for two reactions are shown. reaction X 2NOBr ⇌ 2NO + Br₂ reaction Y 2NOCl → 2NO + Cl₂ The two reactions have similar reaction mechanisms. The initial rate of reaction X is greater than that of reaction Y when measured under identical conditions of temperature, pressure and reactant concentration. Which statements explain this difference? 1 The activation energy for reaction X is less than that of reaction Y. 2 The Br–Br bond is weaker than the Cl–Cl bond. 3 A higher frequency of collisions between molecules of NOBr occur than between molecules of NOCl.
A1 and 2
B2 and 3
C1 only
D3 only
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The correct answer is C. This question tests the candidate's understanding of reaction kinetics within the Chemistrysyllabus. The examiner's mark scheme requires...
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