1. Add to table of contents
Penny lab Pg. 64
Liquids and solids Pg. 65

2. Solids
Liquids
&

3. Liquids -definite volume; no definite shape -slightly compressible
-particles able to move past each
other
-properties determined by strength
of intermolecular forces

4. Solids -definite shape and volume -virtually incompressible
-particles vibrate about fixed positions

5. Freezing Point Melting Point Sublimation Deposition
-temperature at which
a liquid becomes a solid
-0oC for H2O
(exo)
Melting Point
-same temperature as freezing point
-when a solid becomes a liquid
(endo)
Sublimation
-Direct conversion of
a solid to a gas
(endo)
Deposition
(exo)
-reverse of sublimation

6. H2O (s) H2O (g)
Molar heat of sublimation (DHsub) is the energy required to sublime 1 mole of a solid.
Sublimation
Deposition
DHsub = DHfus + DHvap
( Hess’s Law)
11.8

8. Phase Diagrams
Water

9. Definitions
Volatility-changes very quickly Conductivity-ability to transmit electricity Solubility-ability to dissolve in a solvent Brittleness-breaking without significant strain Adhesion-particles sticking to other surfaces Cohesion-particles of the same substance sticking together. Surface Tension-cohesive force of a liquid creating an outer “layer”