Half Life


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DianaTrujillo2K
Posts: 40
Joined: Fri Sep 29, 2017 7:04 am

Half Life

Postby DianaTrujillo2K » Sun Mar 04, 2018 8:03 pm

Can someone explain what the half life of a reaction is? And why would we be interested in a half life of a reaction?

Sabah Islam 1G
Posts: 50
Joined: Sat Jul 22, 2017 3:01 am

Re: Half Life

Postby Sabah Islam 1G » Sun Mar 04, 2018 8:19 pm

A half-life reaction indicates how long it takes for the concentration of a reactant to decrease to half of its initial concentration. We would be interested because it is involved in many things, such as radioactive decay, which pertain to chemistry.

Thuy-Anh Bui 1I
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Joined: Sat Jul 22, 2017 3:00 am
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Re: Half Life

Postby Thuy-Anh Bui 1I » Sun Mar 04, 2018 8:20 pm

The half-life of a reaction is the time required for a reactant to reach half its original concentration. This information is helpful to predict the concentration of a substance over time. Another application that Dr. Lavelle mentioned in class is that knowing the half-life can help to identify an unknown substance because this characteristic is unique to each substance (at a given order).

Luis De La Cruz 1H
Posts: 37
Joined: Fri Sep 25, 2015 3:00 am

Re: Half Life

Postby Luis De La Cruz 1H » Sun Mar 04, 2018 8:50 pm

Another important and perhaps real life application for the half life would be for pharmacists and doctors that are prescribing drugs, since they need to know how long that drug will stay in your system, which is something the half life of a reaction would be able to tell you.

Jessica_Singh_1J
Posts: 50
Joined: Fri Sep 29, 2017 7:03 am

Re: Half Life

Postby Jessica_Singh_1J » Mon Mar 05, 2018 1:32 pm

Half lives can be very useful in determining the approximate age of organic objects via radiometric dating.

Ryan Sydney Beyer 2B
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Joined: Fri Sep 29, 2017 7:07 am
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Re: Half Life

Postby Ryan Sydney Beyer 2B » Mon Mar 05, 2018 1:48 pm

Also for medications. It could be useful to know how long a medicine is going to be active in a patient's body and how much is going to be present.

Diego Zavala 2I
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Re: Half Life

Postby Diego Zavala 2I » Fri Mar 09, 2018 9:28 pm

Hi Diana! The half life tells you how fast/slow a compound decays. It is important because if you are storing a medicine, you might want to know how much is left after a certain time because if you are injecting medicine into a human you will want to know how much you are injecting and also how long the medicine will take to wear off.


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