Question

Given the rate of a hypothetical reaction, 2A + 3B --> A2B3
(a) Express the rate of appearance of A2B3
(b) Express the rate of disappearance of B & A

Answer 1

https://en.wikipedia.org/wiki/Order_of_reaction

Answer 2

So b) would be zero order
a) it could be be second or first order, I would say second order though

Answer 3

First order is only one of the reactants dictates the rate of a reaction, this is normally the case when a reactant has to go under some intramolecular change or dissociation

Answer 4

You can read up on these things in the wikipedia page though