1. http://www.20q.net/ Properties and Changes

2. Physical Properties -a characteristic or trait of something Ex: color, size, shape, texture, luster, state of matter, density, odor, taste

3. Chemical Properties -shows how something reacts in the presence of something else Ex: flammability

4. Physical Changes -Change in appearance only -Does not change what the matter is Ex: phase change, growing, changing clothes, cutting hair, glass breaking

5. Chemical Changes -Change in appearance AND structure of the substance -New substances are formed Ex: Sodium-reacts violently with water Chlorine-poisonous gas Sodium Chloride a.k.a. Salt

6. Types of Fires Class A Class B Class C Class D Combustibles (wood, brush, clothing) Liquids (oil, gasoline, grease, etc) Electrical Combustible Metals (Alkali Metals – sodium, potassium,etc) Water causes these metals to release hydrogen and a large amount of heat causing the hydrogen to ignite and explode