1. Pick up a DENSITY WORKSHEET and quietly work on it.
BELL WORK:
Pick up a DENSITY WORKSHEET and quietly work on it.

2. Let’s Review Physical Properties…
A physical property can be OBSERVED or MEASURED without changing its composition (how it’s made).
Example: density, volume, color, smell, size, shape, mass, weight, strength, flexibility…

3. You use PHYSICAL PROPERTIES every single day…
How?

4. Physical Changes… Physical changes do not form new substances.
EXAMPLES:
Freezing water
Sanding a piece of wood
Dissolving sugar in water
Crushing a Coke can
A popsicle melting
Ripping a piece of paper

5. Chemical Properties…
Chemical properties describe a substance’s ability to change into NEW matter.
Chemical Properties:
Flammability
Reactivity

6. How do you tell a physical property from a chemical property?
You can observe a physical property without changing the identity of the substance.

7. Chemical Changes: EXAMPLES: Soured milk Rusting nail Burning wood
Chemical Changes happen when substances change into new substances AND have new properties.
EXAMPLES:
Soured milk
Rusting nail
Burning wood
Frying an egg
Baking a cake
Fizzing soda

8. CHEAT SHEET!
Signs of Chemical Changes: Change in color Change in odor Production of heat Fizzing and Foaming Sound being given off Light production Solid formation
Bleach ruins your jeans.
Milk sours and stinks.
Light bulb gets hot.
You open a can of Coke.
Fireworks in the sky
Glow stick at a concert
Cake batter turns into cake.

9. Physical or Chemical?
Chemical
Chemical
Physical

10. Physical or Chemical?
Physical
Chemical
Chemical