1. Physical and Chemical Changes

2. Physical changes are those changes that do not result in the production of a new substance. If you melt a block of ice, you still have water at the end of the change.

3. If you break a bottle, you still have glass. Painting your nails will not stop them from being fingernails. Some common examples of physical changes are: melting, freezing, condensing, breaking, crushing, cutting, and bending.

4. Some, but not all physical changes can be reversed. You could refreeze the water into ice, but you cannot put your hair back together if you don’t like your haircut!

5. Special types of physical changes where any object changes state, such as when water freezes or evaporates, are sometimes called change of state operations.

6. Chemical changes, or chemical reactions, are changes that result in the production of another substance.

7. FLAMMABILITY: A material’s ability to BURN in the presence of OXYGEN

8. REACTIVITY: How readily (easily) a substance combines chemically with other substances.

9. When you burn a log in a fireplace, you are carrying out a chemical reaction that releases carbon..

10. Common examples of chemical changes that you may be somewhat familiar with are; digestion, respiration, photosynthesis, burning, and decomposition.

11. Check for understanding…

12. Physical or Chemical Change? Painting Wood PHYSICAL

13. Physical or Chemical Change? Burning Paper CHEMICAL

14. Physical or Chemical Change? Digestion of food CHEMICAL

15. Physical or Chemical Change? Sugar dissolving in water PHYSICAL

16. Physical or Chemical Change? Iron turning red when heated PHYSICAL

17. Physical or Chemical Change? Evaporation PHYSICAL

18. Physical or Chemical Change? A pond freezing in winter PHYSICAL

19. Physical or Chemical Change? Melting ice PHYSICAL

20. Physical or Chemical Change? Cutting wire PHYSICAL

21. Physical or Chemical Change? Painting fingernails PHYSICAL

22. Physical or Chemical Change? Cutting fabric PHYSICAL

23. Physical or Chemical Change? Baking muffins CHEMICAL

24. Physical or Chemical Change? Shattering glass PHYSICAL

25. Physical or Chemical Change? Decomposition of old leaves CHEMICAL

26. Physical or Chemical Change? Wrinkling a shirt PHYSICAL

27. Physical or Chemical Change? An old nail rusting CHEMICAL

28. Your mission in life… Go to the LEARN Site Go to the Topic: Physical and Chemical Changes Board Builder Read the instructions Submit to Mr. K