how do you find the catalyst in a reaction in Kinetic Chemistry?

Question

the question goes:

"The depletion of ozone, O3, in the atmosphere takes place through a series of elementary steps.

1) NO(g) + O3(g) --> NO2 (g) + O2(g) (fast)
2) NO2(g) --> NO(g) + O(g) (slow)
3) O(g) + O3(g) --> 2O2(g) (fast)

a) What is the catalyst in this reaction?
b) Is the catalyst heterogeneous or homogeneous?"


Can anyone tell me how to find the catalyst in this reaction and how to tell whether its **** or heterogeneous? please be specific or detailistic if possible . thank you

Answer 1

ok when you have a reaction with more tham one step
the catalyst is the one that is used in one of the steps and made again at the end of the reactions acording to the reactions above
"NO" is used in the first step and than re-made in the second step
so its the catalyst we are looking for!
sory this reaction is homogeneous
because like our friend said all of them are gas

Answer 2

The reaction is homogeneous, since all of the components are gases.

A catalyst is not consumed in a reaction. In the set you list, NO2 is first generated and then consumed. So it would be considered the catalyst in the 3 reactions.