1. Chemical Properties & 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 H2O at the end of the change.   

3. Some common examples of physical changes are: melting, freezing, condensing, breaking, crushing, cutting, and bending.

4. Examples: break a bottle - you still have glass
Examples: break a bottle - you still have glass. painting your nails will not stop them from being fingernails.  Cutting a large piece of paper – you just have smaller pieces of paper

5. Some, but not all physical changes can be reversed
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!

6. Physical Change? Look for these key words:
Dissolve
Solubility
Melt
Freeze
Evaporate
Cut
Inflate
Paint
Absorb
Condense
Sublimate

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

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

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

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

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

12. When you burn a log in a fireplace, you are carrying out a chemical reaction that releases carbon.  When you light your Bunsen burner in lab, you are carrying out a chemical reaction that produces water and carbon dioxide. 

13. Chemical Change? Look for these key words:
React
Sours
Rots
Cook/Bake
Produces a gas
Burns
Digest
Grows
Decomposes
Rusts
Creates a precipitate
(2 clear liquids making a cloudy solution)

14. Physical or Chemical Change?
Painting Wood
PHYSICAL

15. Physical or Chemical Change?
Burning Paper
CHEMICAL

16. Physical or Chemical Change?
Digestion of food
CHEMICAL

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

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

19. Physical or Chemical Change?
Evaporation
PHYSICAL

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

21. Physical or Chemical Change?
Melting ice
PHYSICAL

22. Physical or Chemical Change?
Cutting wire
PHYSICAL

23. Physical or Chemical Change?
Painting fingernails
PHYSICAL

24. Physical or Chemical Change?
Cutting fabric
PHYSICAL

25. Physical or Chemical Change?
Baking muffins
CHEMICAL

26. Physical or Chemical Change?
Shattering glass
PHYSICAL

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

28. Physical or Chemical Change?
Wrinkling a shirt
PHYSICAL

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