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reaction rate

rate at which reactants change into products over time

instantaneous rate

The rate at any instant in time

rate law

an expression relating the rate of a reaction to the concentration of the reactants

rate constant

a constant of proportionality between the reaction rate and the concentrations of reactants that appear in the rate law

reaction mechanism

a series of elementary reactions that take place during the course of a complex reaction

collision theory

For a reaction to occur, the particles must collide, they must collide with the appropriate orientation, and they must collide with sufficient energy.

activated complex

an unstable arrangement of atoms that exists momentarily at the peak of the activation-energy barrier; an intermediate or transitional structure formed during the course of a reaction


(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

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