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IrinaK [193]
4 years ago
14

Why is melting ice cream a physical?

Chemistry
2 answers:
Usimov [2.4K]4 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]4 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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Quema de calorías que son parte de la energía interna de un cuerpo 

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In the context of small molecules with similar molar masses, arrange these intermolecular forces by strength (hydrogen bonding -
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<h2>Answer:</h2>

Arrangement of inter molecular forces from strongest to weakest.

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<h3>Explanation:</h3>

Intermolecular forces are defined as the attractive forces between two molecules due to some polar sides of molecules. They can be between nonpolar molecules.

Hydrogen bonding is a type of dipole dipole interaction between the positive charge hydrogen ion and the slightly negative pole of a molecule. For example H---O bonding between water molecules.

Dipole dipole interactions are also attractive interactions between the slightly positive head of one molecule and the negative pole of other molecules.

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Br+ is isoelectronic with noble gas?
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Use Hess's Law to calculate the enthalpy change for the reaction
Marysya12 [62]

Answer:

ΔH = 125.94kJ

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It is possible to make algebraic sum of reactions to obtain ΔH of reactions (Hess's law). In the problem:

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3/2 (2):

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The sum of  last both reactions:

WO3(s) + 3H2(g) → W(s) + 3H2O(g)

ΔH = 842.7kJ -716.76kJ

<h3>ΔH = 125.94kJ </h3>
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Bacterial cell, cell with a nucleus, multicellular organism

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