1. Chapter 13 Notes #3 Intermolecular Forces
Chemistry
Chapter 13
Notes #3
Intermolecular Forces

2. Intermolecular Forces
Intramolecular forces – within
Ionic, covalent, and metallic bond
Intermolecular
Means “between” or “among”
Forces of attraction between molecules
3 Types
Dispersion
Dipole-Dipole
Hydrogen Bonds

3. Dispersion Forces Occurs with (mainly) non-polar molecules Weak forces
Based on temporary dipoles
Dipoles = areas of positive and negative due to unequal dispersion of electrons
Temp. dipoles get created when atoms or particles collide, shifting the density of the particle

4. Dispersion Forces Temporary dipole Temporary dipole
Temporary dipoles are attracted

5. Dipole-Dipole Forces Occurs between (mainly) polar molecules
Much stronger than dispersion forces
Permanent Dipoles
Areas of positive and negative due to unequal sharing of electrons in a polar covalent bond
Attraction between positive and negative

6. Dipole-Dipole Forces

7. Hydrogen Bonds
Occurs between H in one molecule and F, N, or O in another molecule
Each has at least one lone e- pair where the bonding can occur
Special type of dipole -dipole force
Strongest intermolecular force
Strong because of the high difference in electronegativity and mass between the atoms

8. Hydrogen Bonds