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Encyclopedia > Frequency factor (chemistry)

In chemical kinetics, the frequency factor or A factor is the pre-exponential constant in the Arrhenius equation, which indicates how many collisions between reactants have the correct orientation to lead to the products. The frequency factor is usually designated by A. In physical chemistry, chemical kinetics or reaction kinetics study reaction rates in a chemical reaction. ... The Arrhenius equation is a simple, but remarkably accurate, formula for the temperature dependence of a chemical reaction rate. ... A reactant or reagent is any substance initially present in a chemical reaction. ...


When this value is written after the "e" term it is referred to as the "post-exponential constant."


See also

A is a constant incorporating the P and Z factors of atomic collision The Arrhenius equation is a simple, but remarkably accurate, formula for the temperature dependence of a chemical reaction rate. ...


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