The three states of matter; solid, liquid, and gases exhibit different nature of particles. The thermal energy and intermolecular force of attraction between particles determine the physical states of matter.
Here, Thermal energy is the energy between constituent particles of matter in a solid is known as Thermal Energy or Kinetic Energy. It determines the mobility of the molecules and its magnitude increases with an increase in temperature. And hence more the thermal energy, the faster will be the movement of molecules.
The forces between constituent particles of matter are known as Intermolecular Forces. In the solid state, the constituent particles are held such that they can’t move from their position.
Dipole-Dipole forces, London Dispersion forces, and Hydrogen bonding are collectively called Van der Waals Forces.
A solid is a substance that has a closed tight crystalline configuration with a rigid, fixed shape, and size.
Also, on the basis of type of arrangement, solids are divided into–
The type of arrangement of the constituent particle which is irregular and not fixed is known as Amorphous Solids. Amorphous solids have a tendency to flow slowly, are also known as Pseudo Solids.
Examples: Glass, Gels, Polymers, etc.
Whereas, the constituent particles that are arranged in a regular way are called crystalline solids. It is also known as True Solids.
Example: Copper, Iron, Sulphur, Phosphorus, etc.
In liquids, the intermolecular forces of attraction are much larger than in gases but smaller than solids. Some key properties of liquids are:
Unlike gases, liquids have a definite volume but no definite shape.
Units of surface tension – N/m or dynes/cm
An important rule to be followed-
It shows the relation between the molar heat of vaporization of a liquid (Joules) and the boiling point of the liquid. The ratio of both is approximately equal to 88.
ΔHv / Tb.p. = 88 JK–1 mol–1
Q1. Which of the following is a type of amorphous solid?
a) Gel solid
b) Copper sulfate crystal
d) Both a and c
Answer – D. Both a and c
Q2. Calculate the surface tension? If 40 Nm of work is done by the liquid on 20 m x 30 m of the liquid surface.
Answer- Given, work done= 40Nm
With area of surface = 20x30 = 600m2
0.066N/m is the applied surface tension
Q3. The magnitude of thermal energy and intermolecular force of attraction is changing with temperature as-
a) Both increases with temperature
b) One increases but the other decreases and then both increasing after a certain time
c) One increases but the other decreasing with temperature
d) Both decreases with temperature
Answer – C. One increases but the other decreases with temperature.
They have an inverse relation with each other that’s why they follow this trend
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