An equation of the form k=Aexp(–Ea/RT) where k is the rate constant of a given reaction and Ea the activation energy. A is a constant for a given reaction, called the pre-exponential factor (or A-factor). Often the equation is written in logarithmic form lnk=lnA – Ea/RT A graph of lnk against 1/T is a straight line with a gradient –Ea/R and an intercept on the lnk axis of lnA. It is named after Svante Arrhenius.
lnk=lnA – Ea/RT