1. WARM UP 1.Identify the intermolecular forces present in each of the following mixtures: -PCl 3 and CCl 4 -H 2 O and H 2 O -NaCl and H 2 -CO 2 and N 2 -HF and HCOOH -Ca 3 (PO 4 ) 2 and H 2 O -BH 3 and CH 2 O -SF 2 and F 2

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 http://www.aip.org/history/einstein/brownian.htm

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.