rates of reaction Flashcards
1
Q
what is collision theory
A
a chemical reaction can only happen if the reactant particles collide with enough energy
2
Q
why does increased surface area increase rate
A
- more solid is exposed to other particles
- so the collision frequency is higher - so there are more successful collisions per unit time
3
Q
why does higher concentration/pressure increase rate
A
- there are more particles per unit volume
- so collisions frequency is higher
- so there are more successful collisions per unit time
4
Q
why does higher temperature increase rate
A
- the particles have more kinetic energy
- so the percentage of collisions with enough energy is higher
- so there are more successful collisions per unit time
5
Q
why do catalysts increase rate
A
- they provide an alternative route with a lower activation energy
- so percentage of collisions with enough energy is higher
- so there are more successful collisions per unit time
