## Half life

$\frac{d[R]}{dt}=-k; [R]=-kt + [R]_{0}; t_{\frac{1}{2}}=\frac{[R]_{0}}{2k}$

Emma Randolph 1J
Posts: 65
Joined: Fri Sep 28, 2018 12:29 am

### Half life

Do we use half life for 0 order reactions or just 1st order?

jonathanjchang2E
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

### Re: Half life

The equation t1/2=0.693/k is only used for 1st order reactions.

LeannaPhan14BDis1D
Posts: 57
Joined: Fri Sep 28, 2018 12:16 am

### Re: Half life

just for the 1st order reactions

Destiny Diaz 4D
Posts: 51
Joined: Fri Sep 28, 2018 12:28 am

### Re: Half life

The half life equation for a zero order reaction is [A0]/2k

005113695
Posts: 59
Joined: Fri Sep 28, 2018 12:15 am

### Re: Half life

theres different half life reactions for zero, 1st, and 2nd order. Only 1st order is independent of the concentration of A.

Samantha Chang 2K
Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

### Re: Half life

Half life reactions are just 1st order reactions!

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