How does increasing the pressure affect the reaction rate?
Increasing the pressure increases the reaction rate (if it's a gaseous reaction).
Collision theory basically says that gaseous chemical reactions happen when reactant molecules collide with enough energy to break their chemical bonds.
When we increase the pressure in a reaction vessel:
- Particles will be closer together.
- Gas particles collide with each other more frequently.
- So, more collisions will happen.
- Reaction rate is therefore increased, because more particles are colliding to form products.