1. Bellringer State the law of conservation of mass.
Mercury (II) oxide yields mercury + oxygen
216 g = g g
Mass of reactant = mass of products

2. Changes in Matter Objectives:
8.0 Distinguish among endothermic and exothermic physical and chemical changes.
Other AOD C.8.4 Differentiate between chemical and physical changes of matter.
Other AOD C.5.3 Describe phase changes in terms of energy absorption or release.

3. Physical Changes
Def.: changes that alter a substance WITHOUT changing its composition.
List some.
Water and change of state
Would melting point and boiling point be intensive or extensive physical properties?

4. Physical Changes (cont.)
Consider the following terms:
Endothermic
Exothermic
What would these terms mean?
What would melting be?
What would boiling be?
What would freezing be?
What would condensing be?

5. Chemical Changes
Def.: involves on or more substances changing into new substances.
List some.
Signs of a chemical change:
Color change
Formation of gas
Energy change (burning)
Change in smell

6. Chemical Changes (cont.)
Endothermic or exothermic?
Baking bread
Striking a match
The glow of a firefly
Photosynthesis
Burning propane in a gas grill

7. Verbal Assessment & Assignment
Section Assessment (p.65): 13, 14
Workbook (p.15): ALL