CBSE Class 12-science Answered

The formula that describes the temperature dependence of the rate constant is attributed to Arrhenius, but is a consequence of our arguments above:

The temperature dependence of the absolute rate constant appears to depend on two quantities (A and E_a), whereas the relative rate constants at two temperatures depend only on one quantity (E_a).

The A factor is equal to the high temperature limiting rate constant for the reaction. This can be seen by inserting a very large (infinite) temperature into the Arrhenius equation above. This is true because at very high temperature, ALL the molecules have enough energy to react, but they must have a collision and the proper geometry even so.