1. Focus Activity In your own words, define the word dense. Try to use the word dense in a sentence. A dense population

2. Meaning Having parts closely compacted together. Crowded or compact. A dense forest A dense population

3. What is density? Density- is the amount of stuff packed into a given amount of space. Density- is the amount of stuff packed into a given amount of space. Characteristic Property~ a property that can be used to identify an unknown substance. Characteristic Property~ a property that can be used to identify an unknown substance. For example, gold has a density of 19.3g/cm 3, and aluminum has a density of 2.7g/cm 3 For example, gold has a density of 19.3g/cm 3, and aluminum has a density of 2.7g/cm 3

4. Bone Density  Nationally, 50% of postmenopausal women will experience a bone fracture as the result of osteoporosis. Nationally, 50% of postmenopausal women will experience a bone fracture as the result of osteoporosis.

5. How is Density responsible for Continental Drift?

6. Convection Convection is the flow of heat through a bulk, macroscopic movement of matter from a hot region to a cool region. As magma heats up, its density decreases. As the magma cools it increases. Convection is the flow of heat through a bulk, macroscopic movement of matter from a hot region to a cool region. As magma heats up, its density decreases. As the magma cools it increases.

7. Calculating Density Density = Mass divided by Volume. Density = Mass divided by Volume. Example: A student wants to find out if his gold chain is real gold. He used a triple beam balance to find the mass, which is 96.5g. Then he uses the displacement method and finds out that his chain has volume of 5mL. Find the density of his chain. Example: A student wants to find out if his gold chain is real gold. He used a triple beam balance to find the mass, which is 96.5g. Then he uses the displacement method and finds out that his chain has volume of 5mL. Find the density of his chain. Mass always goes in the calculator first! Mass always goes in the calculator first! 19.5g/ml or 19.5g/cm 3 19.5g/ml or 19.5g/cm 3 1. Formula 1. Formula 2. Substitute 2. Substitute 3. Solve 3. Solve

8. Example An liquid has a density of 1.5g/ml. How many grams are needed to obtain and a volume of 10ml of liquid. 1.5 g/ml x 10ml = 15grams

9. Density also Determines whether or not an object floats or sinks in water! Density of water is 1.0g/mL Density of water is 1.0g/mL Any object that has a density greater than 1 will sink. Any object that has a density greater than 1 will sink. Any object that has a density less than 1 will float. Any object that has a density less than 1 will float.