A-LevelChemistryChemical energetics9701/12 · Feb/Mar 2022 · 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]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
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
A: Diagram showing an endothermic reaction profile with products at higher energy than reactants, and activation energy Ea.
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