1. How can you to tell the difference??? Physical and Chemical Changes

2. Physical changes are those changes that DO NOT result in the production of a new substance. NEW

3. **If you melt a block of ice, you still have H 2 O at the end. **If you break a bottle, you still have glass. **Painting your nails will not stop them from being fingernails.

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. Physical Change Substance may seem different, but the way the atoms link up is the same.

6. It’s a physical change if… It changes shape It changes size

7. It changes phase freezes Boils evaporates condenses It’s a physical change if…

8. It dissolves

9. CHEMICAL PROPERTIES Chemical properties can ONLY be observed AS the substances are changing into different substances.

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

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

12. Changes the organization of atoms and molecules Makes new substances Chemical Change

13. **When you burn a log in a fireplace, you release carbon. **When you light your Bunsen burner in lab, you produce water and carbon dioxide. **When you mix baking soda and vinegar, you produce CO 2.

14. It could be a chemical change if…. It burns Production of heat or light Temperature changes without heating/cooling

15. It could be a chemical change if... It bubbles It produces a gas

16. It could be chemical change if... Production of sound

17. It could be chemical change if... It changes properties Change in odor or taste

18. It could be chemical change if... It changes color

19. It’s a chemical change if... It forms a precipitate It forms a new substance

20. Common examples of chemical changes … digestion, respiration, photosynthesis, burning, and decomposition.

21. Physical or Chemical Change? Painting a wood block red PHYSICAL

22. Burning Paper CHEMICAL Physical or Chemical Change?

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

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

25. Evaporation PHYSICAL Physical or Chemical Change?

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

27. Melting ice PHYSICAL Physical or Chemical Change?

28. Digestion of food CHEMICAL Physical or Chemical Change?

29. Cutting wire PHYSICAL Physical or Chemical Change?

30. Mixing cake batter PHYSICAL Physical or Chemical Change?

31. Cutting fabric PHYSICAL Physical or Chemical Change?

32. Baking muffins CHEMICAL Physical or Chemical Change?

33. Shattering glass PHYSICAL Physical or Chemical Change?

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

35. Wrinkling a shirt PHYSICAL Physical or Chemical Change?

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