first vs. second order


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005199302
Posts: 108
Joined: Fri Sep 28, 2018 12:15 am

first vs. second order

Postby 005199302 » Sun Mar 03, 2019 5:19 pm

How is a second order reaction different than a first order reaction?

Lexie Baughman 2C
Posts: 30
Joined: Sat Oct 06, 2018 12:16 am

Re: first vs. second order

Postby Lexie Baughman 2C » Sun Mar 03, 2019 5:31 pm

In a first order reaction, there will be one reactant present in the rate law. For a second order reaction, you can either have a rate law with one reactant to the second order, or with two reactants both to the first order. I remember it by adding the exponents of all the reactants in the rate law - whatever the exponent is, that's the order of the rate law.

kateminden
Posts: 63
Joined: Fri Sep 28, 2018 12:24 am

Re: first vs. second order

Postby kateminden » Sun Mar 03, 2019 7:09 pm

In first-order reactions, the reaction rate is directly proportional to the concentration of one of the reactants. These reactions usually take the form of A → products. In contrast, a second-order reaction is one whose rate is proportional to the square of the concentration of one reactant. Second-order reactions often take the form of either A + B → products or 2A → products.


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