1/2 life


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Tatum Keichline 2B
Posts: 64
Joined: Fri Sep 28, 2018 12:26 am

1/2 life

Postby Tatum Keichline 2B » Wed Mar 06, 2019 1:54 pm

Does the 1/2 life for first order depend on the initial concentration like it does for zero and second-order reactions?

David Effio 1H
Posts: 38
Joined: Wed Feb 14, 2018 3:01 am

Re: 1/2 life

Postby David Effio 1H » Wed Mar 06, 2019 2:37 pm

No, if you look at the equation, the half-life only takes into account the rate constant, which is dependent on temp and activation energy only.

Rachel-Weisz3C
Posts: 66
Joined: Fri Sep 28, 2018 12:23 am

Re: 1/2 life

Postby Rachel-Weisz3C » Wed Mar 06, 2019 3:59 pm

1/2 life for first order is the only order that is not dependent on initial concentration but just the reaction constant (k), with units 1/s.

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

Re: 1/2 life

Postby Danielle_Gallandt3I » Wed Mar 06, 2019 4:17 pm

No, based on the half-life equations it is not affected by initial concentration, only the rate constant. This means that the half life is actually more dependent on other factors, such as temperature

SydBenedict2H
Posts: 60
Joined: Wed Nov 08, 2017 3:00 am

Re: 1/2 life

Postby SydBenedict2H » Wed Mar 06, 2019 9:48 pm

Why is it that for only the first order it isn't dependent on the initial concentration?

Raj_Bains_2C
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Re: 1/2 life

Postby Raj_Bains_2C » Wed Mar 06, 2019 11:33 pm

The half-life for first order dow not depend on the initial concentration.

Raj_Bains_2C
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Re: 1/2 life

Postby Raj_Bains_2C » Wed Mar 06, 2019 11:33 pm

Raj_Bains_2C wrote:The half-life for first order dow not depend on the initial concentration.


*does not*

Casandra
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Joined: Fri Sep 28, 2018 12:17 am

Re: 1/2 life

Postby Casandra » Thu Mar 07, 2019 12:02 am

The 1/2 life for a first order does not depend on the initial concentration.


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