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Nataliya [291]
3 years ago
12

A decrease in temperature reduces the volume of gas

Chemistry
2 answers:
Ksenya-84 [330]3 years ago
7 0

Answer:

<em>Chemical</em><em> </em><em>change</em><em>.</em>

<em> </em><em> </em>

<em>Hope</em><em> </em><em>this</em><em> </em><em>helps</em><em> </em><em>you</em><em>.</em>

alisha [4.7K]3 years ago
6 0
A) chemical change.
just the letter A is your answer that says chemical change (sorry had to put extra words for the new policy)
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What branch of science is, matter, energy, motion, forces, time
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These are terms that we use in physics
6 0
4 years ago
Define molecular mass. Calculate the molecular mass of calcium carbonate<br> and nitric acid.
irinina [24]

Answer:

HNO₃ =63.0147 g/mol

CaCO₃ = 100.088 g/mol

Explanation:

Molecular mass:

It is the sum of all the atomic masses of the atoms of elements present in a molecule.

For example:

The formula of CaCO₃:

Calcium carbonate consist of one atom of calcium, one atom of carbon and three atoms of oxygen. Thus, its molecular mass would be,

CaCO₃ = 40.078 × 1 + 12.01×1 + 16.00×3

CaCO₃ = 40.078 + 12.01+ 48

CaCO₃ = 100.088 g/mol

The formula of HNO₃:

Nitric acid consist of one atom of hydrogen, one atom of nitrogen and three atoms of oxygen. Thus, its molecular mass would be,

HNO₃ =1.008 × 1 + 14.0067 ×1 + 16.00×3

HNO₃ = 1.008 +14.0067 + 48

HNO₃ =63.0147 g/mol

5 0
4 years ago
Q = smT
Effectus [21]

Answer:

The heat required is 1262.91 joules or 1.26 kilojoules.

Explanation:

The quantity of heat (Q) required to raise the temperature of a substance depends on its Mass (M), specific heat capacity (C) and change in temperature (Φ)

Thus, Q = MCΦ

Since,

Q = ?

Mass of aluminum sample = 33.0g

C = 0.89 J/g℃

Φ = (Final temperature - Initial temperature)

= 68°C - 25°C = 43°C

Then, Q = MCΦ

Q = 33.0g x 0.89 J/g℃ x 43°C

Q = 1262.91 J

Since the heat in joules is 1262.91, obtain heat in kilojoules.

If 1000 joules = 1 kilojoules

1262.91 joules = Z

To get Z, cross multiply

Z x 1000 = 1262.91 x 1

1000Z = 1262.91

Z = 1262.91 / 1000

Z = 1.26291 kilojoules (when placed as 3 significant figures, Z is 1.26 kilojoules)

Thus, the heat required is 1262.91 joules or 1.26 kilojoules.

4 0
3 years ago
what should you do if you want to decrease the rate of a chemical reaction between a solid and a liquid​
Nadya [2.5K]

Answer:increase the quantity of the solid in the reaction

Explanation:

6 0
3 years ago
Weight is best described as:
riadik2000 [5.3K]
<span>Weight measured as a force in Newtonsis best described by the answer that is listed under option C. It is a measure of gravitational force on an object. So, interestingly an item with a specific mass of say 120KGs on earth would weigh 1200 N but on the moon only weigh 200 N due to the smaller gravitational force.</span>
3 0
3 years ago
Read 2 more answers
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