The decomposition of hydrogen peroxide in the presence of potassium iodide is believed to occur by the following mechanism:

Question

step 1 slow: H2O2 + I^- = H2O + OI^-
step 2 fast: H2O2 + OI^- = H2O + O2 + I^-

1) What is the equation for the overall reaction? Use the smallest integer coefficients possible.

I am not sure about this part.

2) Which species acts as a catalyst? Enter formula if there is one.

I think that I^- is the catalyst.

3) Which species acts as a reaction intermediate?

I think the H2O2 is the reaction intermediate.

4) Complete the rate law fot the overall reaction that is consistent with this mechanism.

I know that it would be k[][] but I am not sure what it is.

Thank you for your help!!