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Chapter 1 Measurements

Chapter 1 Measurements. Density. Density. Density compares the mass of an object to its volume D = mass = g or g volume mL cm 3 Note: 1 mL = 1 cm 3. Learning Check D1. Osmium is a very dense metal. What is its

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Chapter 1 Measurements

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  1. Chapter 1Measurements Density lecturePLUS Timberlake

  2. Density Density compares the mass of an object to its volume D = mass = g or g volume mL cm3 Note: 1 mL = 1 cm3 lecturePLUS Timberlake

  3. Learning Check D1 Osmium is a very dense metal. What is its density in g/cm3 if 50.00 g of the metal occupies a volume of 2.22cm3? a) 2.25 g/cm3 b) 22.5 g/cm3 c) 111 g/cm3 lecturePLUS Timberlake

  4. Solution 2) Placing the mass and volume of the osmium metal into the density setup, we obtain D = mass = 50.00 g = volume 2.22 cm3 = 22.522522 g/cm3 = 22.5 g/cm3 lecturePLUS Timberlake

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

  6. 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 lecturePLUS Timberlake

  7. 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 lecturePLUS Timberlake

  8. Learning Check3 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 K W W V K lecturePLUS Timberlake

  9. 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 lecturePLUS Timberlake

  10. Practice Problems • What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm3? D =25.0g= 29.4cm3 0.850340136 g/cm3 = 0.850 g/cm3 lecturePLUS Timberlake

  11. A piece of wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood? Would the piece of wood float in water? lecturePLUS Timberlake

  12. I threw a plastic ball in the pool for my dog to fetch. The mass of the ball was 125 grams. What must the volume be to have a density of 0.500 g/mL? lecturePLUS Timberlake

  13. An ice cube measuring 5.80cm by 5.80cm by 5.80cm has a density of 0.917 g/mL. What is the mass of the ice cube? lecturePLUS Timberlake

  14. A cup of gold colored metal beads was measured to have a mass 425 grams. By water displacement, the volume of the beads was calculated to be 48.0mL. Given the densities, identify the metal. Gold: 19.3 g/mL Copper: 8.86 g/mL Bronze: 9.87 g/mL lecturePLUS Timberlake

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