Question

5. The following are energy releasing phase changes EXCEPT
A. Condensation B. Freezing C. Deposition D. Sublimation​

Answer 1

Answer: All are energy releasing phase changes EXCEPT sublimation.

Explanation:

When molecules with high energy start to lose their energy and begin to settle down then heat energy is released in this process. Hence, this change is exothermic in nature.

When molecules with low energy absorb heat and start moving randomly from one place to another then molecules move to high energy level. Hence, this change is endothermic in nature.

Condensation - The conversion of gas phase into liquid phase is called condensation. Energy is released in this process.

Freezing - The conversion of liquid phase into solid phase is called freezing. Energy is released in this process.

Deposition - The conversion of gas phase into solid phase is called deposition. Energy is released in this process.

Sublimation - The conversion of a solid phase into gas phase without undergoing liquid phase is called sublimation. Energy is absorbed in this process.

Thus, we can conclude that out of the given options all are energy releasing phase changes EXCEPT sublimation.

Answer 2

The aforementioned options are energy releasing phase changes except: D. Sublimation.

What is a phase change?

A phase change can be defined as the change in the state (phase) of matter of a given chemical compound or substance such as:

• Gas to solid

• Solid to liquid

• Liquid to gas

• Liquid to solid

In Science, a change in the state (phase) of matter that results in the release of energy is known as an exothermic reaction such as:

1. Condensation
2. Freezing
3. Deposition

In conclusion, sublimation​ is not an energy releasing phase change because it is an endothermic reaction.

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