1. Physical vs. Chemical Changes Intro to Chemical Reactions

2. First, Review Properties Physical Properties Tell us what something looks, smells, feels like Chemical Properties Tell us the way a substance reacts with another substance

3. Physical Properties Chemical Properties hard soft rough orange yellow malleable solid liquid gas etc.... rusts flammable etc....

4. Physical Changes Chemical Changes Melting freezing vaporizing tearing breaking etc... rusting burning etc.... The chemical formula of the substance doesn’t change! The chemical formula of the substance changes! NEW substances are formed!

5. Example- Wood Burning Wood: hard brown flammabl e solid Smoke: grey/blac k non- flammabl e gas Ash: grey non- flammabl e solid

6. Distribute “10 Signs of a Chemical Change”

7. Let’s Test Ourselves Melting Ice Tearing Paper Burning Paper Water and baking soda Vinegar and baking soda Rusting Popping a ballon The demise of the Hindenburg burning candle melting wax