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G RADE 8 S CIENCE UNIT 3: FLUIDS &

G RADE 8 S CIENCE UNIT 3: FLUIDS &. VISCOSITY. Chapter 8: Density. describes the amount of mass in a given. volume of a substance. DENSITY.  A measure of the mass. contained in a given volume.  A substance with a. lower density will float on substances with higher densities.

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G RADE 8 S CIENCE UNIT 3: FLUIDS &

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  1. GRADE 8 SCIENCE UNIT 3: FLUIDS & VISCOSITY Chapter 8: Density describes the amount of mass in a given volume of a substance.

  2. DENSITY A measure of the mass contained in a given volume. A substance with a lower density will float on substances with higher densities.

  3. DENSITY AND THE PTM The PTM states that different substances have different sized particles. The PTM also states that there are spaces between the particles.

  4. The greater the spaces between the particles, the less particles therefore the lower the density. Ex. Water vapour has a lower density than liquid water.

  5. In general, gases are less dense than liquids and liquids are less dense than solids.

  6. CALCULATING DENSITY You must know the mass and volume of a substance first. Mass: the amount of matter in a substance. Volume: the amount of space occupied by the substance.

  7. To measure the volume of an irregular shape, you will need to determine the amount of water it displaces.

  8. Formula: Density = Mass (m) Volume (V) m D V

  9. SAMPLE PROBLEMS 1. Find the density of a 10g mass of a substance that has a volume of 2.0 cm³. D=m V D=10g 2.0cm³ D=5.0g/cm³

  10. 2. You want to put 10g of salt into a container. What is the volume of the container if the salt completely fills it? V= m D V= 10g 2.16g/cm³ V= 4.63cm³

  11. What is the mass of 1500mL of helium? m= D x V m= 0.0002g/mL x 1500mL m= 0.3g

  12. on pages 312- 314. the practice problems Assignment: Complete

  13. Pg. 316-319 Core Lab Activity 8-2B: “DETERMINING DENSITY”

  14. TEMPERATURE & DENSITY Increasing temperature will cause the particles in a substance in gain energy, spread out and take up less space. Results in decreased density.

  15. EXAMPLES/ APPLICATIONS... Hot air balloons Warm vs. cool tire pressure Water in each of its three states (water as a solid is less dense as the particles move apart as they freeze)

  16. Drying wood Salt water is more dense Swim bladder (fish) Submarines

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