## Order reactions

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

deniise_garciia
Posts: 30
Joined: Wed Nov 16, 2016 3:04 am

### Order reactions

How do you know if a reaction is zeroth, first or second order if it is not specified?

monikac4k
Posts: 56
Joined: Fri Sep 28, 2018 12:25 am

### Re: Order reactions

Usually, some sort of experimental data will be given to us so that we can figure out what order the reactants are.

Gracie Ge 2E
Posts: 28
Joined: Wed Nov 21, 2018 12:19 am

### Re: Order reactions

you won't. unless you're given other info ([A] change and rate change or actual rate laws)

Jocelyne Milke 1G
Posts: 73
Joined: Fri Sep 28, 2018 12:25 am

### Re: Order reactions

You can look at the units for k if it is given or the rate law

Letizia Ye 4F
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

### Re: Order reactions

You can infer from either the units of the rate constant, or the experimental data will tell you.