## 2nd order

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

Sophia Dinh 1D
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

### 2nd order

How can you tell something is 2nd order?

805422680
Posts: 103
Joined: Sat Sep 14, 2019 12:16 am

### Re: 2nd order

When two first-order reactants affect the rate constant or when one second-order reactant

Helen Struble 2F
Posts: 97
Joined: Sat Aug 24, 2019 12:17 am

### Re: 2nd order

If you are given a plot of 1/[A] by time, and the curve is linear, then you know that the reaction is second order with respect to that reactant. The slope is equal to the rate constant.

Owen-Koetters-4I
Posts: 50
Joined: Fri Sep 28, 2018 12:16 am

### Re: 2nd order

It is second order if two first order reactants affect the rate constant

Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

### Re: 2nd order

If the graph of 1/[A] vs time is linear, or if the exponents of the rate law add up to two, then the reaction is second order.

Aiden Metzner 2C
Posts: 104
Joined: Wed Sep 18, 2019 12:21 am

### Re: 2nd order

If you look at the units and liters and seconds are in the denominator then it is second order.

Ayushi2011
Posts: 101
Joined: Wed Feb 27, 2019 12:17 am

### Re: 2nd order

When the rate is affected by the concentration of two first-order reactants, it is a second order reaction.