Elementary Reactions and Reaction Mechanisms
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
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A reaction mechanism is the sequence of elementary reactions, each occurring exactly as written, that sum to a reaction's overall equation.
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Ozone's decomposition proceeds through two elementary steps summing to the overall equation, though no step shows two ozone molecules colliding.
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A mechanism's steps are literal bond-breaking and bond-forming events, unlike an overall equation, which shows only net substances.