Question

The molecular kinetic energy of liquid is:
A. More than molecular kinetic energy of solids
B. More than kinetic energy of liquids
C. Less than molecular kinetic energy of solids
D. Dependent on the matter

Answer 1

The question given here asks us to find out the kinetic energy of liquids is how much more or less as compared to other states of matter like solids or gases. We will find this with the help of intermolecular spaces and intermolecular forces present in different states of matter.

Complete step-by-step solution:
In the above question we have to find whether the molecular kinetic energy of liquids is higher or lower to solids or not or is it higher or lower to gas or not or is it dependent on the matter.
Now, first of all we will discuss molecular kinetic energy and on what factors does the kinetic energy of the molecules depend?
The kinetic molecular theory of matter tells us about the description of the microscopic properties of atoms or molecules and their interactions, leading to observable macroscopic properties like pressure, volume, temperature. An application of the molecular kinetic theory is that it helps to explain why matter exists in different states that are solid, liquid, and gas and how matter can change from one phase to the next.
The kinetic molecular theory of matter states that:
Matter is made up of particles that are constantly moving in the atmosphere.
All particles have energy, but this energy varies depending on the temperature of the matter. This in turn determines whether the substance will exist in the solid, liquid, or gaseous state. Molecules in the solid phase have the least amount of molecular kinetic energy, while gas particles have the greatest amount of molecular kinetic energy.
The temperature of a substance is the measure of the average of kinetic energy of the particles of matter.
A change in phase may occur when the energy of the particles is changed.
There are intermolecular spaces between particles of matter. The average amount of empty space between molecules becomes progressively larger as a sample of matter moves from the solid to the liquid and gas phases.
There are attractive forces acting between atoms or molecules, and this force becomes stronger as the particles move closer together. These attractive forces are called intermolecular forces.
So, we can say that molecular energy of liquid is more than that of solids
Correct is option (A).

Note: In the above question we got our answer because of the difference between the intermolecular force of attraction of particles of solid, liquid and gases which leads to the different intermolecular spaces of the solids, liquids and gases. So, the molecular kinetic energy of gases is more than that of liquid and liquids have more than that of solids.