1. Collision Theory
This theory states that reactions will occur only if atoms/ molecules within the two (or more) substances “collide”. In other words, touch each other! Therefore, if you want to speed up a rxn, you need to collide particles faster. If you want a reaction to go slower, then you need to keep the molecules from colliding as fast.

2. Heat Increasing the heat energy will make the
molecules move faster = faster collisions

3. Shaking/ Stirring
Adding mechanical energy to the reaction can also increase the speed of the molecules = faster collisions!

4. Increasing Surface Area
More surface area = more space for collisions

5. Change the Concentration
A ratio of the amount of one substance verses the other substance(s). Increase the concentration of one = more possible collisions.
Higher Concentration
Lower Concentration

6. Catalyst
Involves using a separate substance added to the reaction to speed it up.
Hydrogen Fuel Cell