3(a). Diagram 3 shows some processes that involve the changes in the state of matter. Choose the processes that release heat.*

C

D

Explanation:

The processes of freezing sublimation releases heat to environment.

Freezing is a phase change by which a liquid changes to solid.

Sublimation is a phase change in which a gas changes to solid.

Phase changes by which a substance returns back to the state of orderliness involves a loss of heat. Sublimation is can be from solid to gas or gas to solid. In the process from gas to solid, heat is released. But from solid to gas, heat is absorbed.

Where are they though?

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