A-LevelChemistryChemical energeticsFeb/Mar 2022Paper 1 Q91 Mark
Nitrogen monoxide is an atmospheric pollutant that is formed inside car engines by an endothermic reaction between nitrogen and oxygen. N₂(g) + O₂(g) → 2NO(g) Which diagram correctly represents the energy profile for this reaction? [Figure 9.1]
ADiagram showing an endothermic reaction profile with products at higher energy than reactants, and activation energy Ea.
BDiagram showing an exothermic reaction profile with products at lower energy than reactants.
CDiagram showing an endothermic reaction profile with products at higher energy than reactants, but ΔH shown incorrectly as negative.
DDiagram showing an exothermic reaction profile with products at lower energy than reactants, but activation energy shown incorrectly.
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of chemical energetics within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
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