3 years ago

What is a cause of human population decrease

Chemistry

2 answers:

anzhelika [568]3 years ago

4 0

Death, sickness, loss of food and homes, many things tbh

Tresset [83]3 years ago

3 0

War diseases can you give a certain year or somthing?

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Na2CO3 + CO2 + H2O → NaHCO3

Veseljchak [2.6K]

Answer:

i think the answer is d

Explanation:

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3 years ago

Whats the Boiling point of a Solution made by dissolving 31 g of NaCl of Water?

Anna11 [10]

101° C is the answer.

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3 years ago

An empty vial weighs 55.32 g. (a) If the vial weighs 185.56 g when filled with liquid mercury (d = 13.53 g/cm3). What i its volu

Tasya [4]

Answer:

a) Volume of vial= 9.626cm3

b) Mass of vial with water = 62.92 g

Explanation:

a) Mass of empty vial = 55.32 g

Mass of Vial + Hg = 185.56 g

Therefore,

$mass\ of\ Hg = 185.56-55.32 = 130.24 g$

Density of Hg = 13.53 g/cm3

$Volume\ of\ vial = Volume\ of\ Hg = \frac{Mass}{Density} \\\\= \frac{130.24g}{13.53g/cm3} = 9.626 cm3$

b) Volume of water = volume of vial = 9.626 cm3

Density of water = 0.997 g/cm3

$Mass\ of\ water = Density*volume = 0.997g/cm3*9.626cm3=9.60 g\\\\Total\ Mass\ of\ vial = Empty\ vial + mass\ of\ water\\= 53.32+9.60= 62.92g$

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3 years ago

Friction is a force that opposes motion. When friction is present, heat is generated.

anyanavicka [17]

Answer:

I think it is: Some of the energy is converted into thermal energy.

Explanation:

Please let me know if I am wrong so I can fix it :)

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