•A molecule that is moving has
kinetic energy;
faster the motion, the greater the KE. When molecules collide some of the KE is changed into vibrational
energy of the bonds . Sometimes there is enough energy gained through collision to break a
bond and
initiate reaction. If the energy is not enough to break the bond, the molecules bounce of one another with no
reaction occurring.
•So there is some minimum collision energy below which no
reaction occurs.