catalysts Flashcards
1
Q
what is the role of a catalyst?
A
provides an alternate reaction pathway which has a lower activation energy
2
Q
how do catalysts speed up rate of reaction?
A
more particles have or exceed the activation energy so can collide and react
3
Q
what is a heterogenous catalyst?
A
different state to reactants
4
Q
how can heterogenous catalysts increase rate of reaction?
A
increase surface area
- e.g solid turned into powder
5
Q
what is a homogenous catalyst?
A
same state as reactants
6
Q
how do homogenous catalysts increase rate of reaction?
A
combines with reactants to form an intermediate species and then forms the product before reforming
7
Q
how does a catalytic converter work?
A
- reactants are absorbed
- bonds weaken
- chemical reaction occurs
- deabsorption
8
Q
what are the benefits of using catalysts?
A
- lower temp / pressure required
- less energy demand
- less co2 emissions
- better atom economy
