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

 

- 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.