Chemical and Physical Changes

1. Chemical and Physical Changes Mrs. Lowe April 2011

2. Chemical changes • Chemical change is a change that forms a new type of matter • Chemical property is a feature of matter that can cause a chemical change

3. Examples of a different type of matter forming during a chemical change Burning logs ashes New tricycle Rusted tricycle

4. Changes in type of matter Apple Rotting Apple Shiny silver Tarnished silver

5. Some clues or evidence of Chemical Changes • Changing color (food rots, metal rusts or tarnishes) • Having an unusual smell • Changing texture • Becoming more or less acidic • Getting hot or cold without being heated or cooled • Bubbles forming because a gas is giving off

6. Note • During a physical change • bubbles form when water boils, but it is not a chemical change • Modeling clay changes color if you mix two colors together

7. Physical Change Physical change is a feature of matter that you can recognize with your senses. Physical change is a change in matter in which they type of matter stays the same Texture the feel of a surface.

8. Some Physical Properties shape temperature color smell hardness mass weight length state of matter volume texture

9. Some Physical Changes Cutting Bending Tearing Breaking Melting Dissolving Magnetizing Boiling Warming Cooling Freezing Evaporating Separating

10. Physical or Chemical Change Mixing salt and water

11. Physical Change

12. Physical or Chemical Boiling water

13. Physical Change

14. Chemical or Physical Change Cooking an egg

15. Chemical Change

16. Chemical or Physical Change Chewing a cracker

17. Chemical Change

18. Chemical or Physical Change Mixing chocolate powder into milk

19. Physical or Chemical Change Physical change