Reaction orders


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jane_ni_2d
Posts: 67
Joined: Fri Sep 28, 2018 12:23 am

Reaction orders

Postby jane_ni_2d » Wed Mar 06, 2019 2:54 pm

How can you tell the difference between a first/second/and third order reaction?

Ashley Zhu 1A
Posts: 69
Joined: Fri Sep 28, 2018 12:16 am

Re: Reaction orders

Postby Ashley Zhu 1A » Wed Mar 06, 2019 3:34 pm

Dr. Lavelle said in class that we won't have to worry about third order reactions, but for first and second order reactions, you can plot the data given to you on a graph or examine the rate law. If a graph of ln[A] vs. t shows a straight line with a negative slope, you know that it is a first order reaction; by examination, when the orders of each reactant add up to 1 in the rate law, then the reaction is a first order reaction. Similarly, if a graph of 1/[A] vs. t yields a straight line with a positive slope, then the reaction is second order; if the sum of the orders of the reactants in the rate law equals 2, then the reaction is second order.

Danielle_Gallandt3I
Posts: 70
Joined: Fri Sep 28, 2018 12:24 am

Re: Reaction orders

Postby Danielle_Gallandt3I » Wed Mar 06, 2019 4:09 pm

Another way to look at this is to consider how a rate changes as a reactant's concentration changes. If you add more of a reactant and the rate does not change it is a zero order reaction. If you double the concentration and the rate doubles, it is a first order reaction. If you double the concentration and the rate quadruples, it is a second order reaction. This pattern would then continue with any other order


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