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IrinaK [193]
3 years ago
14

Why is melting ice cream a physical?

Chemistry
2 answers:
Usimov [2.4K]3 years ago
5 0
Ice cream melting is a physical and reversible change because it is a solid and the sun's heat is making it melt into a liquid. It is reversible because it is able to change back its state into a solid with the heat taken away. Reversible changes is a change in a substance that can be reversed.


Frozen yogurt dissolving is a physical and reversible change since it is a strong and the sun's warmth is making it soften into a fluid. It is reversible since it can change back its state into a strong with the warmth removed. Reversible changes is an adjustment in a substance that can be switched.
worty [1.4K]3 years ago
3 0

Melting ice cream is a physical change because it is a phase change, the water in the ice cream gains thermal energy and the inter-molecular forces are overcome and the molecules move further apart forming a liquid. It is not a chemical change because no chemical reactions occurred.  

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Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H,
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Answer:

Molecular formula => C₃H₈O₃

Explanation:

From the question given above, the following data were obtained:

Carbon (C) = 39.12%

Hydrogen (H) = 8.75%

Oxygen (O) = 51.12%

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Molecular formula =?

Next, we shall determine the empirical formula of the compound. This can be obtained as follow:

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Divide by their molar mass

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Divide by the smallest

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H = 8.75 / 3.195 = 2.7

O = 3.195 / 3.195 = 1

Thus, the empirical formula is CH₂.₇O

Finally, we shall determine the molecular formula of the compound. This can be obtained as follow:

Empirical formula = CH₂.₇O

Molar mass of compound = 92.09 g/mol

Molecular formula =?

Molecular formula = Empirical formula × n

Molecular formula = [CH₂.₇O]ₙ

92.09 = [12 + (2.7×1) + 16] × n

92.09 = 30.7n

Divide both side by 30.7

n = 92.09 / 30.7

n = 3

Molecular formula = [CH₂.₇O]ₙ

Molecular formula = [CH₂.₇O]₃

Molecular formula = C₃H₈O₃

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