The two-step mechanism below has been suggested for part of the atmospheric nitrogen…

CHEMISTRY · Subjective · A Level · Chemistry · Kinetics · Kinetics

Problem

The two-step mechanism below has been suggested for part of the atmospheric nitrogen oxide cycle: Step 1 (slow): NO + O₃ → NO₂ + O₂ Step 2 (fast): NO₂ + O → NO + O₂ In one sentence, explain why O₃ is not classified as a catalyst in this mechanism.

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