Glossary activated complex. An intermediate structure formed in the conversion of reactants to products.
R is the universal gas constant .
A substance that increases the rate of a chemical reaction, without being consumed or produced by the reaction. Catalysts speed both the forward and reverse reactions, without changing the position of equilibrium . Enzymes are catalysts for many biochemical reactions. The average number of collisions that a molecule undergoes each second. A theory that explains reaction rates in terms of collisions between reactant molecules.