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Density Notes

Density Notes. EQ: What is density?. Depends on the attraction of gravity. matter in the object. A. Mass. Measured in grams (g) Mass vs weight. B. Volume. Measured in cm 3 , mL, L, … Amount of space taken up by an object. Ways to Find Volume. Measuring distance and use an equation.

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Density Notes

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  1. Density Notes EQ: What is density?

  2. Depends on the attraction of gravity matter in the object A. Mass • Measured in grams (g) • Mass vs weight

  3. B. Volume • Measured in cm3, mL, L, … • Amount of space taken up by an object

  4. Ways to Find Volume • Measuring distance and use an equation

  5. Ways to Find Volume • 2. Water Displacement (Final volume – Initial volume)

  6. Thread Vfinal = 98.5 cm3 - Vinitial = 44.5 cm3 Vfishingsinker = 54.0 cm3 98.5 cm3 44.5 cm3 Fishing sinker Water Before immersion After immersion Archimedes Principle https://www.youtube.com/watch?v=ijj58xD5fDI

  7. You Try Initial Final 68.0 mL 64.0 mL

  8. You Try 4.0 mL Final – Initial = _______ 68.0 mL - 64.0 mL 4.0 mL

  9. C. Density Mathematical Definition: amount of mass in a given volume

  10. C. Density • Particle Definition: A measure of how tightly spaced matter is

  11. C. Density • Density is a physical property that can be used to identify a substance

  12. D. Density Practice • A piece of metal with a mass of 1.58 grams was placed into a graduated cylinder filled with 25.65 ml of water and the water level rose to 25.87 ml.

  13. Problem solving in Chemistry GUESS G- Givens U- Unknowns E- Equation S- Substitute S – Solve Don’t forget to round your answer to the correct number of significant Figures

  14. D. Density Practice • A piece of metal with a mass of 1.58 grams was placed into a graduated cylinder filled with 25.65 ml of water and the water level rose to 25.87 ml. Calculate the density and identify the metal. Givens Work m = 1.58 g D = m V = 25.87 mL V - 25.65 mL D = 1.58 g = 7.1818 g/mL 0.22 mL 0.22 mL D = ? = 7.2 g/mL identity?

  15. D. Density Practice Givens Work m = 1.58 g D = m V = V 25.87 mL - 25.65 mL D = 1.58 g = 7.1818 g/mL 0.22 mL 0.22 mL D = ? = 7.2 g/mL identity? Zinc

  16. A substance has a density of 4.50 g/cm3. What is the mass of 6.00 cm3 of this substance? Givens Work D. Density Practice D = 4.50 g/cm3 D = m D V = m 1 V = 6.00cm3 V 1 m = ? m = 4.50 g/cm3 6.00cm3 x = 27 g = 27.0 g

  17. A substance has a density of 5.38 g/cm3. What is its volume if the total mass of the sample is 2.33 g? Rearrange the equation to solve this problem. Density Practice D = m V = ? ___ 1 v D V = m V = m ___ D ___ D D

  18. A substance has a density of 5.38 g/cm3. What is its volume if the total mass of the sample is 2.33 g? Givens Work Density Practice D= m= V= D = m V = m D 1 5.38 g/cm3 V 1 D 2.33 g =0.43308cm3 2.33 g V = 5.38 g/cm3 =0.433cm3 ?

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