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Density

Density. Which is heavier- One pound of lead or one pound feathers?. Density. The formula for density is: mass volume Common units are g/mL, or g/cm 3 , (or g/L for gas) Note: 1 mL = 1 cm 3. Density =. Density. Mass (g). Volume (cm 3 ).

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Density

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  1. Density • Which is heavier- One pound of lead or one pound feathers?

  2. Density • The formula for density is: mass volume • Common units are g/mL, or g/cm3, (or g/L for gas) Note: 1 mL = 1 cm3 Density =

  3. Density Mass (g) Volume (cm3)

  4. Density as Conversion Factors A substance has a density of 3.8 g/mL Density = 3.8 g/mL Equality 3.8 g = 1 mL Conversion factors 3.8 g and 1 mL 1 mL 3.8 g

  5. Density • An object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its mass. M = 11,200 g

  6. Density • A liquid has a density of 0.87 g/mL. What volume is occupied by 25 g of the liquid? V = 29 mL

  7. Volume Displacement A solid displaces a matching volume of water when the solid is placed in water. 33 mL 25 mL

  8. Learning Check What is the density (g/cm3) of 48 g of a metal if the metal raises the level of water in a graduated cylinder from 25 mL to 33 mL? 1) 0.2 g/ cm3 2) 6 g/m3 3) 252 g/cm3 33 mL 25 mL

  9. Solution 2) 6 g/cm3 Volume (mL) of water displaced = 33 mL - 25 mL = 8 mL Volume of metal (cm3) = 8 mL x 1 cm3 = 8 cm3 1 mL Density of metal = mass = 48 g = 6 g/cm3 volume 8 cm3

  10. Learning Check You have 3 metal samples. Which one will displace the greatest volume of water? 1 2 3 Discuss your choice with another student. 25 g Al 2.70 g/mL 45 g of gold 19.3 g/mL 75 g of Lead 11.3 g/mL

  11. Solution 1) 25 g Al x 1 mL = 9.2 mL 2.70 g 25 g Al 2.70 g/mL

  12. density • What happens when corn oil and water are mixed? • Why? • Will lead float in water?

  13. Learning Check Which diagram represents the liquid layers in the cylinder? (K) Karo syrup (1.4 g/mL) (V) vegetable oil (0.91 g/mL) (W) water (1.0 g/mL) 1) 2) 3) K W V V W K W V K

  14. Solution (K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL) 1) V W K

  15. Density and Temperature • What happens to density as the temperature increases? • Mass remains the same • Most substances increase in volume as temperature increases • Thus, density generally decreases as the temperature increases

  16. Density and water • Water is an important exception • Over certain temperatures, the volume of water decreases as the temperature increases • Does ice float in liquid water? • Why? • See Figure 1-3, page 6

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