## Negative Order RXN?

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

Sophia Bozone 2G
Posts: 51
Joined: Fri Sep 29, 2017 7:07 am

### Negative Order RXN?

What does it mean if a reaction has a negative order?

Morgan Baxter 1E
Posts: 50
Joined: Thu Jul 27, 2017 3:00 am

### Re: Negative Order RXN?

I'm not sure, but would it be if the concentration of the reactant doubled, but the rate halved? Would this be an example of a -1 order reaction?

Erik Khong 2E
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: Negative Order RXN?

If a species has a negative order, it means that the more concentration it has, the slower the reaction is.

An example given in the book is the decomposition of ozone, O3, in the upper atmosphere.
Its rate law is: Rate = k[O3]^2*[O2]^-1 or k[O3]^2/[O2]
This means that the reaction of decomposition is slower in areas where the atmosphere has more O2. (Greater denominator = smaller k)