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4 years ago

If heat is released from water, what phase change occurs?

Chemistry

2 answers:

Serhud [2]4 years ago

8 0

Explanation:

It is known that in order to break the bonds in a substance we need to provide it heat energy. Hence, energy will be absorbed by the molecules then and they will move far apart from each other.

Due to this solid state of water will change into liquid state.

On further heating, liquid state of water will change into vapor state.

But when liquid state of water will change into solid state then water molecules need to release energy due to which there occurs decrease in their kinetic energy.

Hence, the molecules will come closer to each other. As a result, liquid state of water will change into solid state (ice).

Thus, we can conclude that if heat is released from water, then phase change occurs from liquid to solid.

gizmo_the_mogwai [7]4 years ago

7 0

Melting phase, the ice is melting into water.

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The question is incomplete, here is the complete question:

Problem page in each of the molecules drawn below one chemical bond is colored red. Decide whether this bond is likely to be polar or not. if the bond is likely to be polar, write down the chemical symbol for the atom which will have more negative charge.

The image is attached below.

Answer:

For carbon dioxide molecule: The bond is considered as polar and the elecvtronegative atom is oxygen.

For water molecule: The bond is considered as polar and the elecvtronegative atom is oxygen.

Explanation:

There are two types of covalent bonds:

Polar covalent bond: This bond is formed when difference in electronegativity between the atoms is present. When atoms of different elements combine, it results in the formation of polar covalent bond. For Example: $CO_2,NO_2$ etc..
Non-polar covalent bond: This bond is formed when there is no difference in electronegativity between the atoms. When atoms of the same element combine, it results in the formation of non-polar covalent bond. For Example: $N_2,O_2$ etc..

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The given bond is present between C and O atom.

Electronegativity value of C = 2.5

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As, electronegativity difference is present. So, the bond is considered as polar and the elecvtronegative atom is oxygen.

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