3 years ago

Write the definition of a compound and give two examples

Chemistry

1 answer:

QveST [7]3 years ago

3 0

Answer:

a thing that is composed of two or more separate elements ex. Acid and Water

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Uranium-238 decays to lead-206 with a half-life of 4.5 x 109 yr. Determine how much uranium-238 decays in milligrams (to three s

Mamont248 [21]

Answer:

2.15 mg of uranium-238 decays

Explanation:

For decay of radioactive nuclide-

$N=N_{0}.(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}$

where N is amount of radioactive nuclide after t time, $N_{0}$ is initial amount of radioactive nuclide and $t_{\frac{1}{2}}$ is half life of radioactive nuclide

Here $N_{0}=4.60 mg$ , $t=4.1\times 10^{9}yr$ and $t_{\frac{1}{2}}=4.5\times 10^{9}yr$

So, $N=(4.60mg)\times (\frac{1}{2})^{\frac{4.1\times 10^{9}}{4.5\times 10^{9}}}$

so, N = 2.446 mg

mass of uranium-238 decays = (4.60-2.446) mg = 2.15 mg

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3 years ago

Which contains more molecules; 1mol H2O2, 1mol C2H6, or 1mol CO?

ser-zykov [4K]

Answer:

C2H6

Explanation:

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3 years ago

A mixture of helium, nitrogen and oxygen has a total pressure of 821 mmHg. The partial pressure of helium is 105 mmHg, and the p

skad [1K]

Answer:

Total partial pressure, Pt = 821 mm Hg

Partial pressure of Helium, P1 = 105 mm Hg

Partial pressure of Nitrogen, P2 = 312 mm Hg

Partial pressure of Oxygen, P3 = ? mm Hg

According to Dalton's law of Partial pressures,

Pt = P1 + P2 + P3

So, <u>P3 = 404 mm Hg</u>

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2 years ago

How many grams of CO2 are produced when 6.55 of Fe2O with an excess of CO?

Anettt [7]

Answer:

the answer is fe20 Hope this helps!

Explanation:

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2 years ago

Plastic is used to cover the copper wire in the power codes of appliances because plastic differs from copper in _________. 1. D

klio [65]

Answer:

Bro, its so obvious. Its electrical conductivity.

Explanation:

4 0

3 years ago

Read 2 more answers