Mechanisms, RDS, Intermediates, Catalysts
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13 Terms
Reaction mechanism
Series of elementary steps showing how a reaction occurs.
Elementary step
A single molecular event in a mechanism.
Molecularity
Number of species colliding in an elementary step.
Termolecular step likelihood
Very improbable; almost never rate-determining.
Rate-determining step (RDS)
Slowest step controlling overall rate.
Intermediate definition
Formed in one step, consumed in another, not in overall equation.
Catalyst definition (mechanism)
Appears as reactant early and product later; not consumed overall.
Intermediate pattern
Product → Reactant.
Catalyst pattern
Reactant → Product.
Stoichiometry vs mechanism
Stoichiometry does not give rate behavior; mechanism does.
Highest peak corresponds to…
Rate-determining step (largest Ea).
Reverse activation energy
Measured from products to transition state.
Mechanisms are proposed based on…
Rate laws, intermediates, catalysts, and experimental evidence.
Note 
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