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kompoz [17]
3 years ago
9

A fossilized bone contains about 65% of its original carbon-14. to the nearest hundred years, how old is the bone

Chemistry
1 answer:
Assoli18 [71]3 years ago
7 0
3600 years.  
Since 65% of the carbon-14 is remaining, we need to get the logarithm to base 2 of 0.65 to determine how many half lives have expired. So: log(0.65)/log(2) = -0.187086643/0.301029996 = -0.621488377  
So we know that 0.621488377 half-lives has gone by to the bone sample. Now we just need to multiply by the half-life of carbon-14 which is 5730 years. So: 0.621488377 * 5730 = 3561.128399 years.  Rounding to the nearest 100 years gives us 3600 years.
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3 0
2 years ago
A rock that has a mass if 180 grams dropped in a graduated cylinder that was originally filled to 52ml; it now reads 62ml. What
Vlad [161]

Answer:

<h2>18 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume} \\

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From the question we have

density =  \frac{180}{10}  \\

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<h3>18 g/mL</h3>

Hope this helps you

5 0
3 years ago
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