Physical and Chemical PropertiesBy the end of the day today:

I will be able to analyze a change in matter and determine if it is a chemical or physical change.

Why does this Matter?Matter

Has mass and takes up space Everything around us is matter

What’s the Difference?

Matter can change Examples: Freeze, cut, burn,

etc. 2 types of changes

1.Physical changes2.Chemical changes

Physical ChangesDefinition: when the state or form

of matter is changed without changing its chemical composition.

Examples: cutting, freezing, melting, etc.

Changes in State: Vocabulary

Chemical ChangeDefinition: takes place on a

molecular level and produces a new chemical substance. A chemical change always involves a

chemical reaction.

Where is the Evidence???

Evidence of a chemical change: color change, gas production, and release of heat, light, odor, or sound.

Examples: Burning (combustion), rusting, tarnishing and fermenting

Name That Change!!

You have 5 seconds to make a decision about whether the change shown is physical or chemical.

Lift up your card indicating which kind of change you think it is.

ice melting

burning a chemistry book

melting iron

frying an egg

fireworks exploding in the sky

turning wood into a baseball bat

baking a cake

sharpening a pencil

carving a watermelon into a creepy looking face

pouring liquid nitrogen into a bowl and watching it vaporize

sulfuric acid on cloth

http://www.youtube.com/watch?v=s0CyLbiwHkg&NR=1&feature=endscreen

Organize that Change!!

If you’re at an odd seat, turn to the next even seat (12, 34, etc.)

Organize the given scenarios into two piles: physical change and chemical change

You have four minutes to work with your partner!

Good Luck!

Check Your Work!Physical Changes Chemical

Changes Chlorine gas liquefies at -35

°C under normal pressure Mixing sugar with coffee Ice freezing in cement

breaking it apart Boiling water for soup Making Kool-Aid Mixing green and yellow

paint Water condensing into

clouds above a lake

Hydrofluoric acid attacks glass

Wood Burning Autumn leaves changing

color Silver tarnishing A nail rusting Combustion of gasoline Wood rotting

Tonight’s Homework

Monday Extended Class packet