## Determining order of a reaction

$\frac{d[R]}{dt}=-k[R]^{2}; \frac{1}{[R]}=kt + \frac{1}{[R]_{0}}; t_{\frac{1}{2}}=\frac{1}{k[R]_{0}}$

Catherine Lowe 1B
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

### Determining order of a reaction

I believe there are some instances when one can just use the coefficients and no information other than the chemical reaction to determine if the reaction is second order. When would this be?

LinaLi2E
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

### Re: Determining order of a reaction

That is when you are looking at the reaction mechanisms. So for reaction mechanisms, you are looking at each step that leads to the total reaction. The order of each reactant of each step is the coefficient.

aaron tang 2K
Posts: 49
Joined: Thu Jul 27, 2017 3:01 am

### Re: Determining order of a reaction

You can just use the coefficients only when using the reaction mechanisms. You are looking at the individual steps then the overall equation. The order of each of reaction determines the coefficients