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2 years ago

8

What happens to temperature as a substance melts and heat energy is used to break the connections between molecules, until all m

elting is complete?.

1 answer:

Trava [24]2 years ago

6 0

What happens to temperature as a substance melts and heat energy is used to break the connections between molecules, until all melting is complete?.

Answer : Stays the same

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The answer would be c

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2 years ago

Calculate the number of moles of caco3 (calcium carbonate, or limestone) in a 20.0g sample of this substance

Brrunno [24]

First calculate for the molar mass of the given formula unit, CaCO₃. This can be done by adding up the product when the number of atom is multiplied to its individual molar mass as shown below.

molar mass of CaCO₃ = (1 mol Ca)(40 g Ca/mol Ca) + (1 mol C)(12 g of C/1 mol of C) + (3 mols of O)(16 g O/1 mol O) = 100 g/mol of CaCO₃

Then, divide the given amount of substance by the calculated molar mass.
number of moles = (20 g)(1 mol of CaCO₃/100 g)
number of moles = 0.2 moles of CaCO₃

<em>Answer: 0.2 moles</em>

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3 years ago

What is the frequency of individuals with doctorates work in the field of physical science

Ghella [55]

Answer:

B) 1000-2000

Explanation:

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3 years ago

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When a radioactive sample decays for 2 half-lives the amount remaining will be ____ of the original?

mash [69]

1/4 of the original.

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3 years ago

The downward pressure on the hg in barometer is ______ the pressure of the atmosphere.

enyata [817]

The downward pressure on the hg in barometer is <u>the same as</u> the pressure of the atmosphere.

The atmospheric pressure or barometric pressure is the force exerted by the air in the atmosphere on the earth's surface.

The atmospheric pressure is caused by air molecules colliding with the surface. The atmospheric pressure at sea level is about 101 kPa and at the cruising altitude of a passenger plane it is 27 kPa.

The atmospheric pressure decrease as the height of a surface above ground level increases.

<h3>What is a barometer?</h3>

A barometer is a measuring instrument used to measure the atmospheric pressure or weight of the air, which is useful for making weather predictions.

Learn more about barometer at: brainly.com/question/1154694

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1 year ago