1. What is a physical change? What is a chemical change?
10/6/2014
What is a physical change? What is a chemical change?

2. PARENT TEACHER CONFERENCE LETTER DUE FRIDAY
Today’s PLANNER
PARENT TEACHER CONFERENCE LETTER DUE FRIDAY

3. Today’s Goal
I can distinguish between physical and chemical changes.

4. Today’s Plan Physical & Chemical Changes Notes Review Lab
Physical & Chemical Changes Practice
Demonstrations

5. PHYSICAL AND CHEMICAL CHANGES

6. Physical PROPERTY
A property that describes a substance without changing the substance
Examples:
Changes in state
Color
Odor
Malleability
Volume
Density
Ductility
Thermal Conductivity
Solubility
Mass

7. A change in a substance that does not change what the substance is.
Physical CHANGE
A change in a substance that does not change what the substance is.

8. EVIDENCE OF PHYSICAL CHANGE
Change in color (NOT extreme)
Change in shape
**STILL THE SAME SUBSTANCE**

9. Chemical PROPERTY A property that describes how a substance can change
Examples:
Ability to rust
Reactivity
Flammability

10. 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)

11. Chemical CHANGE A change in a substance that:
Results in a new substance
Is hard to reverse (change back)

12. EVIDENCE OF CHEMICAL CHANGE
Change in temperature
Extreme change in color (white to purple)
Bubbles
Hard to change back
A NEW SUBSTANCE FORMED

13. 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

14. 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

15. 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

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

17. Oxygen Physical Properties: Chemical Properties: Colorless gas
Gas at room temp
Nonmalleable
Nonductile
Chemical Properties:
Flammable
Very reactive

18. 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

19. Sodium (Na) Physical Properties: Chemical Properties: Soft Silver
Metal
Malleable
Nonductile
Nonsoluble
Chemical Properties:
Reactive with water
Reactive with oxygen

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

21. NaCl Physical Properties: Chemical Properties: Solid White
Soluble in water
Nonmalleable
Nonductile
Not a good conductor
Chemical Properties:
Nonflammable
Mostly nonreactive