## reaction orders

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

Vanessa Reyes_1K
Posts: 60
Joined: Fri Sep 28, 2018 12:28 am

### reaction orders

Does the order of a reactant have to always be a positive, whole number?

Kyle Golden Dis 2G
Posts: 67
Joined: Fri Sep 28, 2018 12:17 am

### Re: reaction orders

Yes. There is a possibility in which the order can be any sign and any fraction.

Nathan Tran 4K
Posts: 92
Joined: Fri Sep 28, 2018 12:16 am

### Re: reaction orders

If for example, a reaction is forming something, the reactant would have to be a negative reaction order. We can also see this as the reverse reaction of something that is decomposing--this is why the equilibrium constant has concentration of products in the denominator.

Hedi Zappacosta 1E
Posts: 66
Joined: Fri Sep 28, 2018 12:27 am

### Re: reaction orders

The order of a reaction is determined by adding up all the exponents in the rate law.