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DENSITY is an important and useful physical property

Learn about the importance and utility of density in identifying substances like gold and mercury. Solve density problems and understand dimensional analysis with this informative presentation by Michael A. Russell.

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DENSITY is an important and useful physical property

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  1. DENSITY is an important and useful physical property Gold Density Presentation by Michael A. Russell for the Teaching and Learning Cooperative at Mt. Hood Community College 19.3 g/cm3 Mercury 13.6 g/cm3

  2. DENSITY is an important and useful physical property Gold 19.3 g/cm3 Mercury 13.6 g/cm3

  3. DENSITY is an important and useful physical property Gold 19.3 g/cm3 Many substances can be identified based solely upon their density; very important to chemists Mercury 13.6 g/cm3

  4. Density Problem Problem: A piece of copper has a mass of 57.54 g. It is 9.36 cm long, 7.23 cm wide, and 0.95 mm thick. Calculate density (g/cm3).

  5. Density Problem SOLUTION 1. Get dimensions in common units.

  6. Density Problem SOLUTION 1. Get dimensions in common units. 2. Calculate volume in cubic centimeters. (9.36 cm)(7.23 cm)(0.095 cm) = 6.4 cm3

  7. Density Problem SOLUTION 1. Get dimensions in common units. 2. Calculate volume in cubic centimeters. (9.36 cm)(7.23 cm)(0.095 cm) = 6.4 cm3 3. Calculate the density.

  8. Relative Densities of the Elements

  9. DENSITY Styrofoam Brick Be sure to notice that DENSITY is an INTENSIVE PROPERTY of matter. INTENSIVE - does not depend on quantity of matter. Contrast with EXTENSIVE - depends on quantity of matter. Examples are mass and volume.

  10. PROBLEM: Mercury (Hg) has a density of 13.6 g/cm3. What is the mass of 95 mL of Hg? In grams? In pounds? Solve the problem using DIMENSIONAL ANALYSIS - see the Dimensional Analysis and Factor Label handouts

  11. PROBLEM: Mercury (Hg) has a density of 13.6 g/cm3. What is the mass of 95 mL of Hg? First, note that 1 cm3 = 1 mL

  12. PROBLEM: Mercury (Hg) has a density of 13.6 g/cm3. What is the mass of 95 mL of Hg? First, note that 1 cm3 = 1 mL Then, use dimensional analysis to calculate mass.

  13. PROBLEM: Mercury (Hg) has a density of 13.6 g/cm3. What is the mass of 95 mL of Hg? First, note that 1 cm3 = 1 mL Then, use dimensional analysis to calculate mass. What is the mass in pounds? (1 lb = 454 g)

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