1. WARM UP
Identify the intermolecular forces present in each of the following mixtures:
PCl3 and CCl4
H2O and H2O
NaCl and H2
CO2 and N2
HF and HCOOH
Ca3(PO4)2 and H2O
BH3 and CH2O

2. The Big Bang Theory

3. Properties of Phases

4. Solids Definite shape and volume (crystal)
Strong intermolecular forces
Little motion

5. Gases Change shape and volume Lots of molecular motion and space
Very little forces to hold them together

6. Liquids Definite volume, change shape
Some intermolecular forces, but they can be broken and re-formed

7. Properties of Liquids Increased with stronger IMFs Viscosity
Resistance to flow
Surface tension
Surface molecules pulled together

8. Properties of Liquids Cohesion and adhesion
Stickiness to itself, and to other things

9. Water’s Special Properties
Strong H-bonds give it “super-stickiness”
High density liquid
Expands on freezing
Ice floats

10. WRAP UP
Describe how the intermolecular forces present in solids, liquids, and gases are different.

11. WARM UP
List the 4 properties of liquids that are affected by intermolecular forces. Describe how they change as the strength of intermolecular forces change.

12. MINI-LAB
Drops on a Penny
Heather Nelson
January 2012

13. WRAP UP List 2 or 3 unique properties of water.
Explain why water has those properties.