Review

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 • 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 • Chemical • Sugar dissolving in water • Physical

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

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