[ayslam]

In collision theory, a chemical reaction is the result of molecular collision. For a particular elementary reaction, it takes place only if the molecules 1.) collide with the right orientation and 2.) possess energy more than its activation energy. What if either one if both of the conditions are not satisfied? Do the molecules still exchange energy? or What will happen?

Do you have any suggestion of good websites or books for introductory collision theory?

Thanks a lot!

[xiankai]

it will simply bounce off, energy is transferred according to the law of conservation of momentum.

try this site : http://www.chemguide.co.uk/physical/basicrates/introduction.html

[ghb]

In collision theory, the Lindemann's assumption was originally taken as that each collision would totally transfer the energy to facilitate the reaction to happen, it was also cited as the "strong collision" assumption. However, in many cases the possess energy may not be strong enough and the "weak collisions" may happen, as described in the research on the isotope effect in ozone formation, by Gao and Marcus (Science 2001, 293, 259-263).