First Order

First Order Definition:

A reaction that has a rate equation in which the sum of all exponents is one.

First Order Explained:

According to what kind of substance such as (reactant, catalyst, or product) it is the index or exponent to which its concentration rate is raised.

Equation is as such:r\;=\;k[{\mathrm {A}}]^{x}[{\mathrm {B}}]^{y}... A and B represent concentrations the reactions order.