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Understanding Density: Mass, Volume & Calculation Explanation

Learn what density is, how it depends on gravity, and how to measure mass and volume. Practice calculating density with examples and equations for chemistry problems. Discover the key concept of Archimedes' Principle and its application in determining the volume of objects.

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Understanding Density: Mass, Volume & Calculation Explanation

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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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