The most obvious factor that affects k from basic principles
if we knew the answers to two questions:
The collision frequency of gas molecules depends on the number of molecules in a given volume, how large they are, and how fast they are moving. The measurable variables that control these are concentration, molecular weight, and temperature. Molecules move faster as the temperature increases, and for a given temperature (or kinetic energy), lighter molecules move faster than heavier ones. The kinetic theory of gases can give us an exact expression for the collision frequency. What is the probability that any given collision will lead to chemical reaction rather than to recoil? The simplest possible model of chemical reactivity
proposes a threshold energy, E |