## Meaning of Zero, First, and Second Order?

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

Michelle Wang 4I
Posts: 63
Joined: Fri Sep 28, 2018 12:27 am

### Meaning of Zero, First, and Second Order?

What exactly does it mean if a reaction is zero, first, or second order?

Ethan Yi 1K
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

### Re: Meaning of Zero, First, and Second Order?

the order of a reaction depends on how the concentrations of reactants affect the rate of the reaction. if the reactant concentration does not impact the rate, it is zero order (rate = k). if there is a linear relationship, where the rate and concentration have a direct correlation, it is first order (rate = k[A]). second order would be rate = k[A]^2

Ariel Cheng 2I
Posts: 67
Joined: Fri Sep 28, 2018 12:29 am

### Re: Meaning of Zero, First, and Second Order?

Remember you can also relate order numbers to individual reactants themselves or also the overall reaction order.

lizettelopez1F
Posts: 29
Joined: Fri Sep 28, 2018 12:19 am

### Re: Meaning of Zero, First, and Second Order?

To figure out the order, you would keep in mind that the graph you need to take into consideration is concentration over time.

Subhani Diu 1F
Posts: 16
Joined: Fri Sep 28, 2018 12:20 am

### Re: Meaning of Zero, First, and Second Order?

The orders correspond to the sum of the reactants' individual orders. It's helpful looking at the particular graphs to determine the overall reaction order.