Question

On heating liquids, the intermolecular space between molecules:
a.) Increases
b.) Decreases
c.) Remains same
d.) Depends on particles

Answer 1

Hint:. The knowledge of the difference between the solids, liquids and gases that is the phase change can help in finding the answer for the above.

Complete step by step answer:
There are three types of phases that a compound can exist, they are
Solids
Liquids &
Gases

The molecules in the solids are very close and are tightly packed so the intermolecular forces or the attraction forces between the molecules in the solid is large compared to that of liquids and gases.
In liquids the molecules are spaced so that the spaces are in between the solids and gases and the intermolecular forces also lie in between the solids and liquids.
The molecules in gases are far apart from each other and the spaces are very large when compared to the solids and liquids and the intermolecular forces are very less compared to the solids and liquids due to their large separation.

When the temperature is raised for a substance then the substance absorbs the heat up to a certain limit and after that the phase change takes place from solid to liquid and liquid to gas. So the absorbed energy is sufficiently high to overcome the intermolecular forces between the molecules.
So if the liquid is heated then the liquid absorbs the heat to overcome the attractions between the molecules and phase change takes place so that the intermolecular space between the molecules increases.
So, the correct answer is “Option A”.

Note: When the temperature increases beyond the energy required to overcome the attraction forces between the phase changes takes place from solid to liquid and liquid to gases.