1. + Fluids and Viscosity Chapter 8 Density Describes the amount of mass in a given volume of a substance. Intro Video

2. + Defining Density Section 8.1Page 302

3. + DENSITY A measure of the MASS contained in a given VOLUME. VIDEO

4. + A substance with a lower density will FLOAT on substances with higher densities.

5. + DENSITY and The Particle Theory of Matter DIFFERENT substances have DIFFERENT sized particles. Therefore, each substance has its own unique DENSITY, based on particle size, shape, and mass. The PTM states:

6. + DENSITY and The Particle Theory of Matter There are spaces between the particles Therefore, The GREATER the spaces between the particles, the less particles can fit in the same space and therefore the lower the DENSITY Water vapor has a lower density than liquid water The PTM states:

7. + DENSITY and The Particle Theory of Matter There are attractive forces between particles Therefore, The weaker the forces of the substance, the easier it is for objects to SINK through it The PTM states:

8. + In general, gases are less dense than liquids and liquids are less dense than solids. SolidLiquidGas DIAGRAM PARTICLESVery close to each other Close to each other Distant from each other DENSITYHighModerateLow

9. + There are some exceptions! Iron on Mercury Wood on Water

10. + Questions to Consider Page 309 # 1,2,4,5,6 and Pause and Reflect

11. + Determining Density Section 8.2Page 310

12. + Calculating Density You need to know: MASS – The AMOUNT of Matter in a Substance VOLUME – The amount of SPACE Matter occupies or takes up. The volume of Irregularly shaped solids can be measured by displacement – amount of space an object takes up when placed in fluid

13. + DENSITY FORMULA Density (D) = Mass (m) Volume(V) D= m V M = D x V V = m D D= m V M = D x V V = m D

14. + Sample Problem 1: Finding D Find the density of a 10g mass of an unknown substance that has a volume of 2.0 cm 3 D = ? m = 10g V = 2.0 cm 3 D = m V D = 10g 2.0 cm 3 D = 5.0 g/cm 3

15. + Sample Problem 2: Finding V You want to put 10g of salt into a container. What is the volume of the container, if the salt completely fills it? D = 2.16 g/cm 3 m = 10g V = ? V = m D V = 10g 2.16 g/cm 3 V = 4.63 cm 3 The Density comes from the chart on page 312

16. + Sample Problem 3: Finding m What is the mass of 1500 mL of Helium? D = 0.0002 g/mL m = ? V = 1500 mL m = D x V m = 0.0002 g/mL x 1500 mL m = 0.3 g The Density comes from the chart on page 312

17. + Core Lab 8-2B page 317 Determining Densities

18. + Questions to Consider Page 323 # 1-9

19. + Changes in Density Section 8.3Page 324

20. + Temperature and Density Increasing temperature will cause the particles in a substance to GAIN ENERGY, S P R E A D O U T and take up more space Results in a decreased density

21. + Hot air balloons Warm versus cool tire pressure Drying wood Swim bladder in fish Salinity of water Examples and Applications

22. + Questions to Consider Page 309 # 1,2,4-7 and Pause and Reflect