Starter – 4/11

1. Starter – 4/11 Physical characteristics can be used to describe and distinguish a person from other people. An accurate physical description can often be used to identify a person in a crowd. Practice identifying physical characteristics with the animals listed below. tiger lion cheetah leopard bobcat 1. What characteristics make these animals similar? 2. What characteristics make them different?

2. Physical and Chemical Changes How to tell the difference

3. Physical Change- • physical properties change, but the substance is the same • Change in what you see but does not produce a new substance • Painting a house, cutting hair, ironing shirt, melting water/boiling water

4. Some physical changes are reversible, some are not • Reversible—freezing & melting water, braiding hair • Non-reversible—slicing a tomato, peeling an orange

5. It’s a physical change if • It changes shape or size • It dissolves.

6. It’s a physical change if... • It changes phase (freezes, boils, evaporates, condenses)

7. Chemical Change • Chemical Change- • when substances react to form one or more NEW substances • Look for permanent change in color, gas bubbles, leftover solid • Non-Reversible

8. It’s a chemical change if…. • It burns • Temperature changes without heating/cooling

9. It’s a chemical change if... • It bubbles (makes a gas)

10. It’s a chemical change if... • It changes color permanently • It forms a leftover solid

11. Examples: • Silver ring that turns green • Rusting cars • Copper pennies turning green • Baking powder in cake – cake rises • Vinegar and baking soda • Adding vinegar to milk • Lighting a match • Explosion or burning of wood

12. What kind of change is it if someone... • Tears up paper? • Physical change • Mixes salt and water? • Physical change

13. What kind of change is it if someone... • Burns paper? • Chemical change • Evaporates salt water? • Physical change

14. What kind of change is it if someone... • Mixes vinegar and baking soda? • Chemical change