# How does a catalyst affect collision theory?

May 12, 2016

The catalyst does not affect the rate of collision since it does not change the kinetic energy ($K E$) of particles.

#### Explanation:

A catalyst by definition is a substance which is not a reactant nor a product that increases the rate of the reaction by lowering its activation energy (see graph below).

$\textcolor{g r a y}{\text{Image source}}$: http://www.silicones.eu/science-research/adjuvants-and-auxiliaries/catalysts

$\textcolor{b l u e}{\text{uncatalyzed reaction}}$
$\textcolor{red}{\text{catalyzed reaction}}$

Note that the catalyst does not affect the rate of collision since it does not change the kinetic energy ($K E$) of particles.

$K E = \frac{3}{2} R T$

The kinetic energy depends only on temperature, and catalyst does not change the temperature of a reaction.

Chemical Kinetics | A Model for Chemical Kinetics & Catalysis.