Explanation:
- Boiling point is defined as the point where vapor pressure of a liquid becomes equal to the vapor pressure of atmosphere.
So, when molecules of a substance are held together by strong intermolecular forces of attraction then in order to separate the molecules we need to provide great amount of heat to the substance.
As a result, boiling point of liquid will increases when there are strong intermolecular forces.
- When molecules beneath the surface of a liquid tends to attract the molecules present at the surface then a force is exerted at the surface of the molecules of the liquid which is known as surface tension.
Hence, weaker the intermolecular forces, the lower the surface tension.
- The pressure exerted by a gas on the surface of a liquid is defined as the vapor pressure.
Hence, greater the intermolecular forces, the lower the vapor pressure of a substance will be.
- Viscosity is defined as the ability of a liquid to resist its flow.
Hence, weaker is the intermolecular forces present less will be viscosity of the substance.
Therefore, we can conclude that given properties are associated as follows.
- Strong Intermolecular forces:
- High boiling point.
- High viscosity.
- Low vapor pressure.
- High surface tension.
- Weak Intermolecular forces:
- Low boiling point.
- Low viscosity.
- High vapor pressure.
- Low surface tension.
