9.5 Flashcards
1
Q
what is a catalyst ?
A
a substance that increases the rate of reaction by providing an alternative pathway that has a lower activation energy
2
Q
is a catalyst chemically changed or unchanged at the end of the reaction ?
A
unchanged
3
Q
what are the two types of catalysts ?
A
heterogeneous and homogeneous
4
Q
what is a heterogeneous catalyst ?
A
- a different phase from the reactants
- different state to the reactants
5
Q
Increasing the surface area of the heterogeneous catalyst would do what the rate of the reaction ?
A
increase the rate of reaction as more particles can react with the catalyst at the same time
6
Q
what is a homogeneous catalyst ?
A
- in the same phase as the reactants
- are in aqueous in aqueous reactants
7
Q
how does homogeneous catalyst form intermediate species ?
A
by reactants combining with the catalyst which react to form products so the catalyst is reformed again
