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a constant of proportionality between the reaction rate and the concentrations of reactants that appear in the rate law
a series of elementary reactions that take place during the course of a complex reaction
For a reaction to occur, the particles must collide, they must collide with the appropriate orientation, and they must collide with sufficient energy.
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
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