2 years ago

Is pluto a planet CER

1 answer:

4 0

This has been an ongoing debate between scientists and astrologers. It is actually classified as a dwarf planet.

Hope this helps!
~Brooke

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A fossil was analyzed and determined to have a carbon-14 level that is 70 % that of living organisms. The half-life of C-14 is 5

Citrus2011 [14]

Answer: 2948

Explanation:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{0.693}{k}$

$k=\frac{0.69}{t_{\frac{1}{2}}}=\frac{0.693}{5730}=1.21\times 10^{-4}years^{-1}$

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

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

where,

k = rate constant = $1.21\times 10^{-4}years^{-1}$

t = age of sample = ?

a = let initial amount of the reactant = 100

a - x = amount left after decay process = $\frac{70}{100}\times 100=70$

$t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{70}$

$t=2948years$

Thus the fossil is 2948 years old.

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2 years ago

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Virty [35]

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A=8, B=7,C=N

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3 years ago

According to this balanced equation, how many grams of water (H.0) form in

miskamm [114]

Answer:

your simpal answer is 177.32

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Which of the following is a characteristic of all chemical changes?A. A different state of matter is produced. B. Some mass is c

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Letter A is the characteristic of all chemical change

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What happens when water changes from a solid to a liquid to a vapor

mote1985 [20]

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It forms a water cycle!

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