Half life of 1st-Order Reaction


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Fionna Shue 4L
Posts: 59
Joined: Fri Sep 28, 2018 12:18 am

Half life of 1st-Order Reaction

Postby Fionna Shue 4L » Sun Mar 10, 2019 8:51 pm

Conceptually, why does the half life of a first order reaction not depend on the initial concentration?

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

Re: Half life of 1st-Order Reaction

Postby Danielle_Gallandt3I » Sun Mar 10, 2019 9:01 pm

I think it is because it is actually proportional to the rate constant k (so it is dependent on the environment, temp activation energy, etc). Another way to think about this is that a second half life takes the same amount of time as the first half life would, even though there is half the original concentration.

dgerges 4H
Posts: 65
Joined: Fri Sep 28, 2018 12:24 am

Re: Half life of 1st-Order Reaction

Postby dgerges 4H » Sun Mar 10, 2019 9:10 pm

because half life of any quantity of a first order reaction is the same, it'll take the same time to halve no matter how much it started with


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