1. Homework for week of Jan 24-28 Mon S. Learn Chemical vs. Physical Change Tues C. Lab Day Chemistry Current Event due Thursday Weds Review Th Bond Test Fri CSA Present Progress Reports 1 week from today Please place Balancing Equations 101 out to be collected.

2. Explain the difference between Physical Change and Chemical Change

3. Physical Change A change in a substance that does not change the identity of the substance.

4. Physical Change Examples: Ice melting Ripping paper in half Mixing ice tea mix in water Chewing your food

5. Chemical Change A change in a substance that results in a new substance being formed.

6. Chemical Change Examples: Burning a match Cooking food Rust forming Digesting food

7. Physical Change or Chemical Change ? You decide.. Chemical changeBurning the wick of a birthday candle Physical changePutting salt on the icy sidewalk Physical changeThe melting wax on a candle Chemical changeBaking a cake

8. Physical Change or Chemical Change ? You decide.. Physical changeColoring in a coloring book Chemical changeBleaching your hair Physical changeCutting your hair Physical changeSawing a piece of wood

9. Chemical changes create new substances substances. New substances are the result of a chemical reaction reaction.

10. Mg (s) + 2 HCl (aq) → MgCl 2­(aq) + H 2(g)

11. Another example : Electrolysis of water produces new substances known as Hydrogen and Oxygen gas (H 2 ) (O 2 ) 2H 2 O (l) --> 2H 2(g) + O 2(g)