Question

Which of the following requires the most input of energy?

Answer 1

Vaporizing a substance so the answer is D

Answer 2

Answer : The correct option is, (D) vaporizing a substance

Explanation :

During the phase change, the energy is required to change the bonding between the molecules.

Melting : It is a phase change in which the solid state changes to the liquid state.

In the case of melting, the energy is added to break the bonds between the molecules.

Freezing : It is a phase change in which the liquid state changes to the solid state.

In the case of freezing, the energy is removed as the molecules bonded to one another.

Vaporization : It is a phase change in which the liquid state changes to the gaseous state.

In the case of vaporization, the more amount of energy is required to break the bonds between the molecules and need to escape into the atmosphere.

Hence, the vaporizing a substance requires the most input of energy.