1. Density A quantitative physical property

2. Density At the conclusion of our time together, you should be able to: 1.Define density 2.Calculate the density of a given object if given the volume and mass 3.Calculate the volume or mass if the density is given with the volume or mass

3. Definition Density is defined as mass per unit volume It is the amount of matter within a certain volume Density = mass volume Units = g/mL (liquid) OR g/cm 3 (solid)

4. Which one is more dense?

6. ► Which is heavier, a kilogram of feathers or a kilogram of bricks? ► Which takes up more space? ► If two objects have the same mass, the one with the higher density will take up less space. Neither Feathers

7. Which is heavier, a liter of water or a liter of mercury? If we have equal volumes of two different substances, then the one with the greater density will have the greater mass. Water has a density of 1.0 g/ml and mercury (Hg) has a density of 13.6 g/ml.

8. Density Calculations Example 1: A chunk of silver has a mass of 21.0 g and a volume of 2.00 cm 3. What is the density of silver? Set up your density problems as shown on the handout: Given: m = 21.0 g V = 2.00 cm 3 Required: D

9. Density Calculations Example 1: A chunk of silver has a mass of 21.0 g and a volume of 2.00 cm 3. What is the density of silver? Analysis: D = m V Solution: D = 21.0 2.00 cm 3 D = 10.5 g/cm 3 Paraphrase: The density of silver is 10.5 g/cm 3.

10. Density Calculations Example 2: The density of lead is 11.35 g/cm 3. Determine the mass of a cube of lead with sides 2.5 cm long.

11. Density Calculations Example 3: What is the volume of a solid that has a mass of 5.00 X 10 4 mg and a density of 55 g/cm 3 ?

12. Density Calculations m DV Cover up whatever unit you are solving for, the two units remaining will show you how to solve the problem.

13. Homework – pg. 25 # 1 – 5 Let’s see if you can: 1.Define density 2.Calculate the density of a given object if given the volume and mass 3.Calculate the volume or mass if the density is given with the volume or mass