Chemistry - Colision Theory


- Info:

- Collision theory states that chemical reactions start when atoms or molecules hit each other under specific angle and speed.

- This tutorial is based on


- Example:

- Collision theory will be explained on collision between molecules ethene CH2=CH2 and hydrogen cloride HCl.

- This reaction is represented with following formula:


CH2=CH2 + HCl CH3CH2Cl


- Reaction can only happen if the hydrogen end of the H-Cl bond approaches the carbon-carbon double bond.

- Any other collision between the two molecules doesn't work and molecules simply bounce off each other.

- This is ilustrated in following image.



- Even if the molecules are orientated properly, no reaction will occure unless the particles collide with a certain

minimum konetic energy, called the activation energy of the reaction.