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soldier1979 [14.2K]
3 years ago
7

I need a science fair project that doesn't need anything on the pic and it can be about any subject thanks.

Physics
1 answer:
tigry1 [53]3 years ago
7 0

you could make a self propelled car all you need is cardboard, wheels, and a balloons or rubber bands

  

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The answer would be:

B. Chlorine, iodine and Fluorine

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harina [27]

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Strontium−90 is one of the products of the fission of uranium−235. This strontium isotope is radioactive, with a half-life of 28
Ludmilka [50]

Answer : The time passed in years is 20.7 years.

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Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

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t = time passed by the sample  = ?

a = initial amount of the reactant  = 1.00 g

a - x = amount left after decay process = 0.600 g

Now put all the given values in above equation, we get

t=\frac{2.303}{2.47\times 10^{-2}}\log\frac{1.00}{0.600}

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Therefore, the time passed in years is 20.7 years.

8 0
3 years ago
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