### Half Life

Posted:

**Sat Mar 16, 2019 11:31 pm**Will the half life equations be given to us or will we have to derive them?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=149&t=45153

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Posted: **Sat Mar 16, 2019 11:31 pm**

Will the half life equations be given to us or will we have to derive them?

Posted: **Sat Mar 16, 2019 11:34 pm**

While the formula sheets vary from year to year, it's likely that if these half-life equations were on the most recent exam, they will be on the final exam formula sheet. :)

Posted: **Sun Mar 17, 2019 8:59 am**

On the equation sheet on the website, the half-life formulas are given. However, the equation sheet does not specify which order reaction each equation is for, so make sure that you know the difference between the equations.

Posted: **Sun Mar 17, 2019 4:43 pm**

Half life equations are given in the equation sheet, but they will not tell you which half-life equation corresponds to which order of reaction. You can also derive them using the standard half life equation, solving for t when the concentrations are half of the initial.

Posted: **Sun Mar 17, 2019 4:45 pm**

The half life equations are on the equation sheet

Posted: **Sun Mar 17, 2019 5:17 pm**

The half lives are provided on the formula sheet.

Posted: **Sun Mar 08, 2020 6:37 pm**

They will likely be on the formula sheet, but if you do need to derive the formula, plug in t=1/2 to get the half life formula.

Posted: **Wed Mar 11, 2020 7:08 pm**

lukezhang2C wrote:Half life equations are given in the equation sheet, but they will not tell you which half-life equation corresponds to which order of reaction. You can also derive them using the standard half life equation, solving for t when the concentrations are half of the initial.

Thatâ€™s really helpful, thank you!