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

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

3. If you melt a block of ice, you still have H2O at the end
**If you melt a block of ice, you still have H2O 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
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…
It changes phase
freezes
Boils
evaporates
condenses

8. It’s a physical change if…
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. Chemical Change Changes the organization of atoms and molecules
Makes new substances

13. When you burn a log in a fireplace, you release carbon
**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 CO2.

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. Physical or Chemical Change?
Burning Paper
CHEMICAL

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

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

25. Physical or Chemical Change?
Evaporation
PHYSICAL

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

27. Physical or Chemical Change?
Melting ice
PHYSICAL

28. Physical or Chemical Change?
Digestion of food
CHEMICAL

29. Physical or Chemical Change?
Cutting wire
PHYSICAL

30. Physical or Chemical Change?
Mixing cake batter
PHYSICAL

31. Physical or Chemical Change?
Cutting fabric
PHYSICAL

32. Physical or Chemical Change?
Baking muffins
CHEMICAL

33. Physical or Chemical Change?
Shattering glass
PHYSICAL

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

35. Physical or Chemical Change?
Wrinkling a shirt
PHYSICAL

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