## Order of Reaction

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

Charisse Vu 1H
Posts: 101
Joined: Thu Jul 25, 2019 12:17 am

### Order of Reaction

How do you determine if a reaction is zero, first, or second order? Is there a way to tell without looking at a graph?

Nathan Rothschild_2D
Posts: 131
Joined: Fri Aug 02, 2019 12:15 am

### Re: Order of Reaction

The way to tell if a reaction is a zero order reaction is when the rate is unaffected by the concentration of the reactants. First order reactions rate changes linearly based on 1 reactant concentration.

smurphy1D
Posts: 51
Joined: Mon Nov 18, 2019 12:18 am

### Re: Order of Reaction

By looking at the rate law, a 0 order equation with be the simplest looking [A]= -kt + [A]. The first order equation always has ln before [A] so , ln[A]= -kt + ln[A]. Finally 2nd order has [A] in a fraction over 1, so 1/[A]= kt + 1/[A].

Asha Agarwal 1E
Posts: 51
Joined: Fri Aug 30, 2019 12:16 am

### Re: Order of Reaction

Yes, by comparing equations with rates and concentrations for different experiments as we did in class you can find the exponents for the differential rate laws and the exponent directly corresponds to the order of the reaction.