## Ways of determining what order reactions are

$\frac{d[R]}{dt}=-k[R]; \ln [R]=-kt + \ln [R]_{0}; t_{\frac{1}{2}}=\frac{0.693}{k}$

Sarah Sharma 2J
Posts: 33
Joined: Fri Sep 29, 2017 7:05 am

### Ways of determining what order reactions are

Hello, I was wondering what are some ways of classifying what orders certain reactions are in? What are some key details that we can look for?

Sarkis Sislyan 1D
Posts: 31
Joined: Thu Jul 27, 2017 3:00 am

### Re: Ways of determining what order reactions are

The order of a reaction is found by adding up the orders of all the reactants. To find the order of a reactant, we can use experimental data given to us. If an increase in concentration of a reactant doesn't change the reaction rate, then that reactant is a 0 ordered reactant. If the ratio of concentration change equals the ratio of reaction rate change when changing a single reactant, then that reactant is a 1st ordered reactant. If the ratio of concentration change equals the ratio of the reaction rate change squared, then that reactant is a 2nd ordered reactant.

Yixin Angela Wang 2H
Posts: 51
Joined: Thu Jul 27, 2017 3:00 am

### Re: Ways of determining what order reactions are

Also looking at a graph of the data will give you an idea of what order a reaction is. For example, if the data looks linear, its first order.