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3. Light acts like (1 point)

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alexandr402 [8]2 years ago

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As Matter Changes States of matter does chemical composition stay the same or not

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Whether water is frozen, in a gaseous state, or is a liquid, it is still H2O. So the chemical composition does stay the same.

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The half life for the decay of carbon-14 is 5.73 x 10 years. Suppose the activity due to the radioactive decay of the carbon-14

Elena-2011 [213]

Answer:

Age of the atifact is $4.2\times 10^{2}$ years

Explanation:

For first -order radioactive decay- $A_{t}=A_{0}(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}$
$A_{t}$ represents activity of radioactive nuclide after t time, $A_{0}$ represents initial activity of radioactive nuclide and $t_{\frac{1}{2}}$ represents half-life
Here, $A_{t}=19Bq$ , $A_{0}=20Bq$ and $t_{\frac{1}{2}}=5.73\times 10^{3}years$

Plug-in all the given values in the above equation-

$19=20\times (\frac{1}{2})^{\frac{t}{5.73\times 10^{3}}}$

or, $t=4.2\times 10^{2}$

So, age of the atifact is $4.2\times 10^{2}$ years

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Find the molality of the solution if 42 grams of lithium chloride (LiCl) are dissolved in 3.6 kg of water.

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The molality is calculated using the following rule:
molality = number of moles of solute / kg of solvent

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molar mass of LiCl = 6.941 + 35.453 = 42.394 gm
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molality = 0.99 / 3.6 = 0.275 m

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