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atoms, ions and molecules can react to form products when they collide if the particles have enough kinetic energy
an unstable arrangement of atoms that forms for a moment at the peak of the activation-energy barrier
specific rate constant
a proportionally constant relating to the concentrations of reactants to the rate of the reaction
one in which the conversion of reactants to products and the conversion of products to reactants occurs at the same time
when the rates of the forward and reverse reactions are equal and the reaction has reached a state of balance
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