wtfudge is this? topscore3 GC

[JustwantDDS]

so i dont know how to do this at all
i know half life rxns are 1st order
but what is .693

and how are we supposed to do .693/1.5
or even .7/1.5

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[Dusk]

lol I doubt those kind of calc will be on dat. You can always put in scientific notation and kind of round tho

 

[AlbinoPolarBear]

The half life formula:

t(1/2) = ln2/k
t(1/2) = 0.693/k


Know it.

 

[indigenoustw]

0.693 is ln(2). Result of solving constant k from 1/2 = e^-kt for half life.

As far as dividing decimals, just multiply 10^x to both the numerator and denominator; x being the number of tens to get rid the decimal. For instance, 0.693/1.5 = 693/1500. Then divide and maybe estimate when you know the first two numbers for the answer.

And for this question, you know the answer got to be A because 693/1500 won't even get you numbers smaller than 10^-2.

 

[JustwantDDS]

The half life formula:

t(1/2) = ln2/k
t(1/2) = 0.693/k


Know it.

you mean k= 0.693/ t(1/2) ?

 

[Demps]

you mean k= 0.693/ t(1/2) ?

Same thing

 

[LetsGo2DSchool]

ln 2 = .693 should be one of the easier things to remember.

Just think "69" !

 

[JustwantDDS]

wow brain freeze. got it thanks

 

[AlbinoPolarBear]

you mean k= 0.693/ t(1/2) ?

Same thing. I just put the equation in a more familiar arrangement.

 

[es1113]

you mean k= 0.693/ t(1/2) ?

same thing lol

 

[JustwantDDS]

yea yea yea i know same thinggggggggggg i had a brain fart

 

[Dusk]

yea yea yea i know same thinggggggggggg i had a brain fart

brain farts are the best kind of farts

 

[toothhornet88]

brain farts are the best kind of farts

Not if they happen during the DAT! lol

 

[AlbinoPolarBear]

brain farts are the best kind of farts

I see... we have a fart connoisseur on this forum lol.