Question

so someone should teach me a simple way to do half lives, it'd be very helpful!

Answer 1

What the question suggests ?

Answer 2

For times that you can divide wholely into...for example
Half-life of 60 seconds, find blah blah amount in 3 minutes
Just make a table
Time Amount Remaining
0 100%
60 sec 50%
etc etc
For more complicated problems, resort to the exponential decay formula:
The half-life formula is Nt = No(1/2)^(T/Tt), where
Nt is the quantity that still remains and has not yet decayed
No is the initial quantity of the thing that will decay
T is the amount of time that has passed
Tt is the half-life

Answer 3

the equations my teacher gave to me were t(1/2)=0.693/K and ln[A]=-Kt+ln[Ao]. How would i use those in a story problem?

Answer 4

t(1/2)=0.693/K and ln[A]=-Kt+ln[Ao] are equations for a first order reaction

calculating the half life from this is easy, just find K

notice that ln[A]=-Kt+ln[Ao]
looks like y = mx+b