1. Everyday Chemical Changes

2. Corrosion The slow chemical change
occurs when a metal reacts with oxygen
forms a new substance called an oxide.

3. Rusting Time Lapse http://www.youtube.com/watch?v=fPaHp28zx90

4. Kinds of Corrosion
Rusting
Aluminum oxide
Tarnish

5. Rusting
A chemical change
Involves iron and oxygen

6. Aluminum Oxide A chemical change Involves aluminum and oxygen.
The oxide acts as a protective coating.

7. Tarnish
A chemical change that involves silver and oxygen.

8. Preventing Corrosion
Paint the surface of the metal (or spray it with oil).

9. Preventing Corrosion
Attach a metal that corrodes faster than the metal you want to protect.

10. Preventing Corrosion
Mix certain metals together (nickel, iron, and copper).
The nickel and copper oxides form a protective layer that prevent further rusting. (creates an alloy)

11. Preventing Corrosion
Use materials that have different chemical properties (plastics).

12. Combustion A substance reacts rapidly with oxygen and releases energy
Examples
Burning gasoline in a car
Fireworks
A fire in a fireplace