1. Review
Review worksheet from Friday
Foldable

2. Chemical and Physical Properties/Chemical and Physical Change
Objectives:
Identify b/t chemical and physical change
Differentiate b/t chemical and physical properties

3. Physical Change
Physical change-do not result in production of a new substance.
Melting ice---solid water to liquid water
Breaking window will still result in glass, just smaller pieces
Examples: melting, freezing, condensing, breaking, crushing, cutting and bending

4. Some More About Physical Change
Some can be reversed
Refreeze
Putting window together

5. Special Physical Changes
Objects change state
Water freezing or evaporating
Change of State Operations

6. Chemical Properties
Can only be observed when the substance is changing to different substance.
A.k.a. Chemical reactions
Changes that result in production of a new substance

7. Chemical Properties
Flammability: ability to burn in presence of oxygen
Reactivity: how easily a substance combines with others

8. Chemical Changes Can make new substances Can be detected
Water, flour, yeast and salt
Heat in oven--bread
Can be detected
Change in odor or color
Fizzing or foaming
Sound, heat, light or odor
Cannot be reversed by physical changes
Bread baking, milk souring, iron rusting

9. Physical or Chemical Painting Wood Physical Burning Paper Chemical
Digestion of Food
Sugar dissolving in water

10. Physical or Chemical Iron turning red when heated Physical Evaporation
A pond freezing
Melting ice
physical

11. Physical or Chemical Painting fingernails Physical Baking muffins
Decomposition of old leaves
Wrinkling a shirt
An old nail rusting
chemical