rate constant

The rate coefficient or rate constant of a chemical reaction is the coefficient that precedes reactant concentrations in a simple rate equation. For a chemical reaction n A + m B → n ' C + m ' D, with rate equation:k(T) is the reaction rate coefficient or rate constant.Rate coefficient includes all factors that affect reaction rate, except for concentration, which is explicitly accounted for. Rate coefficient is therefore not constant; because of that reason the name rate coefficient is preferred over rate constant. Rate coefficient is mainly affected by temperature as described by Arrhenius equation but also, ionic strength, surface area of the adsorbent (for heterogeneous reactions), light irradiation...
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(k) A rate constant is a proportionality constant that appears in a rate law . For example, k is the rate constant in the rate law d[A]/dt = k[A]. Rate constants are independent of concentration but depend on other factors, most notably temperature.

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