Question

When heat energy is removed, two changes are observed:

Change A: Gas changes phases to a liquid.
Change B: Liquid changes phases to a solid.

What are the names for phase changes A and B?

A is condensation and B is freezing.
A is condensation and B is melting.
A is evaporation and B is freezing.
A is evaporation and B is melting.

Answer 1

Answer : The correct option is, A is condensation and B is freezing.

Explanation :

Melting or fusion : It is a type of process in which the phase changes from solid state to liquid state at constant temperature.

Freezing : It is a type of process in which the phase changes from liquid state to solid state at constant temperature.

Evaporation : It is a type of process in which the phase changes from liquid state to gaseous state at constant temperature.

Condensation : It is a type of process in which the phase changes from gaseous state to liquid state at constant temperature.

Sublimation : It is a type of process in which the phase changes from solid state to gaseous state without passing through the liquid state at constant temperature.

Deposition : It is a type of process in which the phase changes from gaseous state to solid state without passing through the liquid state at constant temperature.

The given observations are:

Change A: Gas changes phases to a liquid. → Condensation

Change B: Liquid changes phases to a solid. → Freezing

Hence, the correct option is, A is condensation and B is freezing.

Answer 2

Answer: Option (A) is the correct answer.

Step-by-step explanation:

Condensation is defined as the process in which vapors or gaseous phase changes into liquid phase.

Freezing is the process in which liquid phase changes into solid phase.

Evaporation is the process in which liquid phase changes into vapors or gaseous phase.

Melting is the process in which solid phase changes into liquid phase.

Therefore, we can conclude that names for given phase changes A and B is that A is condensation and B is freezing.