The document describes the three major types of intermolecular forces of attraction: London dispersion forces, dipole-dipole forces, and hydrogen bonding. London dispersion forces are the weakest and result from fluctuations in electron distribution. Dipole-dipole forces are stronger and exist between polar molecules. Hydrogen bonding is the strongest intermolecular force and occurs when hydrogen is bonded to an electronegative atom. These intermolecular forces affect the properties of substances, including their solubility, melting point, boiling point, surface tension, and viscosity.

1. INTERMOLECULAR FORCES
OF ATTRACTION
Objective:
• Describe the three major types of intermolecular
forces of attraction.

2. INTERMOLECULAR FORCES OF ATTRACTION (IMFA)
– is simply an attractive force between neighboring molecules.

3. THREE COMMON TYPE

4. ▪️ The weakest among intermolecular forces.
▪️ Originate from the fluctuations of the electron distribution
around the molecule over time.
▪️ Larger molecules have larger electron clouds, they exhibit
stronger dispersion forces than smaller molecules.
▪️ Present in molecules

6. ▪️ stronger than London Dispersion Force because
polar molecules have a permanent uneven
distribution of electrons.
▪️ present only in polar molecules.

8. ▪️ a special type of Dipole – Dipole interaction that occurs in
molecules having a hydrogen atom bonded to an
electronegative atom.
▪️ the strongest intermolecular force of attraction among
three.

10. EFFECTS OF INTERMOLECULAR FORCES
ON THE PROPERTIES OF SUBSTANCE

11. 1. Solubility
2. Melting point
3. Boiling point
4. Surface tension
5. Viscocity
EFFECTS OF IMFA ON THE PROPERTIES OF A
SUBSTANCE

12. THANK YOU!
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