1. Properties of Matter Chemical Properties: the way a substance reacts with others to form new substances with different properties. Example: Steel, rubber, & plastic Chemical properties involve the Reactivity of elements or compounds

2. Chemical properties are related to the specific elements that make up the substances. ◦ Example: Carbon in charcoal will burn = flammability (chemical property)

3. Physical Properties Remain the same for a pure substance Can be observed or measured without a change in composition ◦ Color, shape, odor, etc. Also include melting point, boiling point, strength, & magnetism.

4. Density Density = The mass per unit volume of a substance Low Density = “Light” High Density = “Heavy” Heavier items are more dense. D = Mass Volume

5. You can determine if an item will float or sink if you know the density. More dense = ________ Less dense = ________ The units for density are grams per cubic centimeter ◦ g/cm 3

6. Practice Problems Mass = 9.17 g Volumes = 10.0 cm 3 What is the density?

7. Practice Problems What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm 3 ?

8. A piece of wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood? Would the piece of wood float in water?

9. A cup of gold colored metal beads was measured to have a mass 425 grams. By water displacement, the volume of the beads was calculated to be 48.0 cm 3. Given the following densities, identify the metal. Gold: 19.3 g/mL Copper: 8.86 g/mL Bronze: 9.87 g/mL

10. Buoyancy The force with which a more dense fluid pushes less dense substances upward. ◦ Example: Ice & Water