Writing rate laws


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Gavin Kellerman 1D
Posts: 17
Joined: Sat Jul 09, 2016 3:00 am

Writing rate laws

Postby Gavin Kellerman 1D » Tue Mar 06, 2018 9:51 pm

When a reactant is first order is it necessary/proper to write the exponent of 1 in its rate law? For 0 order reactions, should the reactant be included in the rate law at all?

RohanGupta1G
Posts: 34
Joined: Sat Jul 22, 2017 3:00 am

Re: Writing rate laws

Postby RohanGupta1G » Tue Mar 06, 2018 9:53 pm

When the reactant is first order, you do not need to include the exponent, when the reactant is 0 order, you do not need to write the reactant at all.

Sarah Rutzick 1L
Posts: 50
Joined: Tue Oct 10, 2017 7:13 am

Re: Writing rate laws

Postby Sarah Rutzick 1L » Tue Mar 06, 2018 10:09 pm

Also, when you have a zero order reaction, the rate is equal to the equilibrium constant k, so you don't need to include the reactant.

Morgan Baxter 1E
Posts: 50
Joined: Thu Jul 27, 2017 3:00 am

Re: Writing rate laws

Postby Morgan Baxter 1E » Tue Mar 06, 2018 11:05 pm

If a reaction is zero order it should not be included in the rate law. If it was there, it would falsely report that concentration of the reactant influences the rate of reaction. It does not, so it should not be included.

Phillip Winters 2F
Posts: 50
Joined: Fri Sep 29, 2017 7:05 am

Re: Writing rate laws

Postby Phillip Winters 2F » Wed Mar 07, 2018 12:20 am

It's not necessary to write the 1 in first order reactions, the one is just implied if you write out the reactant with no exponent


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