1. Which one is not like the others?
1/24/2014
Which one is not like the others?
Your self starter is the paper in the basket.

2. Today’s Goal
I CAN use physical and chemical changes to decide if a chemical reaction has taken place.

3. Today’s Schedule Review Warm-up Physical and Chemical Changes Notes
Physical and Chemical Changes Practice
Physical and Chemical Changes Pictures

4. PHYSICAL AND CHEMICAL CHANGES
(one more time)

5. Characteristic that you can observe directly
Physical PROPERTY
Characteristic that you can observe directly
Examples:
Boiling Point
Melting Point
Brittleness
Elasticity
Density
Transparency
Ductility

6. Change when the identity of the substance is still the same
Physical CHANGE
Change when the identity of the substance is still the same

7. Chemical PROPERTY
Characteristic that can only be observed when one substance changes into another substance
Examples:
Ability to rust
Reactivity with vinegar
Flammability

8. Chemical CHANGE
Transforms one type of matter into another kind of matter, usually resulting in new properties

9. Chemical Properties Flammability - The ability to burn
Ability to rust - Reacts with oxygen to produce rust
Reactivity with vinegar - Reacts with acids to make something new (gases)

10. Physical Properties
Transparency - The property of letting light pass through something
Boiling point - The temperature when a substance changes from liquid to gas
Melting point - The temperature when a substance changes from solid to liquid
Brittleness - The property of breaking easily

11. Physical Properties
Elasticity - The property of being stretched Density - How close together the particles are in something Ductility - The property of being reshaped

12. 1 Glass Breaking 2 Hammering Wood 3 Rusting Bike 6 Bleaching Hair
CHEMICAL
PHYSICAL
PHYSICAL
6 Bleaching Hair
4 Melting Butter
5 Separate Sand & Gravel
PHYSICAL
CHEMICAL
PHYSICAL

13. 7 Frying an egg 8 Squeeze oranges 9 Melting Ice 10 Mix salt and water
CHEMICAL
PHYSICAL
PHYSICAL
10 Mix salt and water
12 Water evaporating
11 Mix oil and water
PHYSICAL
PHYSICAL
PHYSICAL

14. 13 Cutting grass 14 Burning Leaves 15 Fireworks exploding
CHEMICAL
PHYSICAL
CHEMICAL
17 Crushing a can
16 Cutting hair
18 Boiling water
PHYSICAL
PHYSICAL
PHYSICAL

15. Hydrogen Physical Properties: Chemical Properties: Colorless Flammable
Gas at room temp
Chemical Properties:
Flammable
Very reactive

16. Oxygen Physical Properties: Chemical Properties: Colorless gas
Blue when liquid
Gas at room temp
Chemical Properties:
Flammable
Very reactive

17. Water (H2O) Physical Properties: Chemical Properties:
Colorless when gas
Clear liquid & solid
Can be solid, liquid, or gas at normal temps
Chemical Properties:
Nonflammable
Nonreactive

18. Sodium (Na) Physical Properties: Chemical Properties: Soft Silver
Metal
Chemical Properties:
Reactive with water
Tarnishes easily

19. Chlorine (Cl) Physical Properties: Chemical Properties: Green
Occurs as gas
Chemical Properties:
Toxic Gas
Very reactive

20. NaCl Physical Properties: Chemical Properties: Solid White
Crystal lattice structure
Dissolves in water
Does not conduct electricity
Chemical Properties:
Nonflammable
Mostly nonreactive