| Figure PRS.3A-8 Boltzmann distribution of energies
As we just saw only those collisions that have an energy EA or greater result in reaction. We see form Figure PRS.3A-10 that the higher the temperature the greater number of collision result in reaction.
However, this Equations (9) and (11) cannot be used to calculate A for a number reactions because of steric factors and the molecular orientation upon collision need to be considered. For example, consider a collision in which the oxygen atom, O, hits the middle carbon in the reaction to form the free radical on the middle carbon atom CH3 HCH3
Otherwise if it hits anywhere else, say the end carbon,  will not be formed†
Consequently, collision theory predicts a rate 2 orders of magnitude too high for the formation of CH3HCH3.
We will only state other definition is passing, except for the energy barrier concept which will be discussed in transition state theory.
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