1. INTERMOLECULAR FORCES
PAGE 56 IN NOTEBOOK

2. Intramolecular force Forces with in the molecule
These would be the bonds formed between two elements
Types of intramolecular forces
Ionic bonds
Covalent bonds
Metallic bonds

3. INTERMOLECULAR FORCES
Introduction:
The physical properties of melting point, boiling point, vapor pressure, evaporation, viscosity, surface tension, and solubility are related to the strength of attractive forces between molecules.
These attractive forces are called Intermolecular Forces. The amount of "stick togetherness" is important in the interpretation of the various properties listed above.
There are four types of intermolecular forces.
1. Ionic forces (strongest)
Van der Waals forces
2. Hydrogen bonding
3. Dipole-dipole
4. London dispersion forces (weakest)

4. IONIC FORCES-the strongest forces

5. FORCES BETWEEN MOLECULES
There are 3 basic types of van der Waals interaction between molecules
(in order of increasing strength):
London dispersion forces (very weak)
dipole-dipole interactions
hydrogen bonds (strong)
these secondary bonding interactions, involve the electrons (atomic glue!).

6. LONDON DISPERSION FORCES-very weak forces

7. 2. DIPOLE FORCES
Polar covalent molecules are sometimes described as "dipoles", meaning that the molecule has two "poles".
One end (pole) of the molecule has a partial positive charge while the other end has a partial negative charge.
The molecules will orientate themselves so that the opposite charges attract principle operates effectively.

8. DIPOLE FORCES

9. HYDROGEN BONDING-strong bonds
Bond between a partially positively charged hydrogen and a negatively charged second element

10. Water as a "perfect" example of hydrogen bonding
Things to know about water!!!!
UNIVERSAL SOLVENT
BENT MOLECULAR GEOMETRY
And WATER IS POLAR!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ALL DUE TO HYDROGEN BONDING!!!!!!

12. Surface tension of water
SKIN OR LAYER ON TOP OF WATER DUE TO HYDROGEN BONDING
THIS IS WHY IT HURTS TO DO A “BELLY BUSTER” INTO A POOL OR LAKE!!!!!!

13. Cohesion and Adhesion

14. ice floats on water
Because ice is less dense than water due to the arrangement of hydrogen bonds

15. On a separate sheet of paper IMF A layer questions
What is the difference in an intermolecular force and an intramolecular force?
What is the strongest IMF?
What is the weakest IMF?
Draw three water molecules. Then form hydrogen bonds between them.
STAPLE TO YOUR UNIT SHEET AND TURN IN