## Order reactions

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

Guillermo Vega 1H
Posts: 10
Joined: Wed Nov 18, 2015 3:00 am

### Order reactions

What are the differences between 1st order reaction, 2nd order reaction, and Zero-order reaction, and under what circumstances would we use either 1st, 2nd, or Zero Order reactions?

kimberly_oka_2j
Posts: 9
Joined: Wed Sep 21, 2016 2:59 pm

### Re: Order reactions

Zero order reactions have rates that are not affected by a change in the concentration, first order reactions have rates that are proportional to the change in the concentration, and second order reactions have rates that are proportional to the square of the change in the concentration. We won't be able to determine which order a reaction is from just the equation, but we can look at the change in the concentration. I hope this helps!

Payton Schwesinger 1J
Posts: 45
Joined: Fri Sep 29, 2017 7:04 am

### Re: Order reactions

You can determine which type of reaction it is by looking at how the rate changes in response to concentrations. Based on this, you can determine which order reaction it is and use the correlating equation.

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

### Re: Order reactions

Order reactions are determined by looking how the rate changes in relation to the concentration. Then you can use the proper equation and apply it to the problem.

Josh Moy 1H
Posts: 58
Joined: Thu Jul 13, 2017 3:00 am

### Re: Order reactions

Order reactions are determined by how the rate changes in respect to concentration

Wenxin Fan 1J
Posts: 53
Joined: Thu Jul 13, 2017 3:00 am

### Re: Order reactions

The order of the reaction is the addition of the exponents in the rate law equation. The different orders help you to determine the rate of the reactions in reference to the consumption of reactants. The order is an important aspect in the rate law.

Jennifer Ho 1K
Posts: 31
Joined: Thu Jul 13, 2017 3:00 am

### Re: Order reactions

The order of the reaction depends on the exponents of the rate law, either determined through a given mechanism or through a table of experimental values showing the rate of reaction at different reactant concentrations.