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Density Lab Overview


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Density Lab Overview

  1. 1. DENSITY Mr. Bantay - Oceanography
  2. 2. LAB OVERVIEW: Density • The Earth is structured on the basis of DENSITY
  3. 3. What is Density? • Density is described as the amount of matter within a given amount of volume. • Simply, it’s the amount of molecules in a given amount of space. • As a result, substances with a higher density will settle to the bottom and substances with lower density will rise. • The size of the substance will NOT affect DENSITY.
  4. 4. Density • Examples: a) Cold water/air b) Warm water/air
  5. 5. Let’s Practice • Pick up worksheet and calculator. • Answer questions.
  6. 6. How do we find the density of a substance? 1. You need to know the MASS. -simply use a scale or triple beam balance to obtain its mass (in grams).
  7. 7. 2. You need to know its VOLUME.
  8. 8. The OBJECTS
  9. 9. The OBJECTS
  10. 10. FORMULA? L x W x H Length = 6cm
  11. 11. FORMULA? L x W x H Length = 6cm Height = 4cm
  12. 12. FORMULA? L x W x H Length = 6cm Height = 4cm Width = 2cm
  13. 13. FORMULA? L x W x H Length = 6cm Height = 4cm Width = 2cm
  14. 14. So, the VOLUME of this object is 48 cm3
  15. 15. The OBJECTS
  16. 16. Find VOLUME
  17. 17. The METHOD -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  18. 18. 1. Note the water level -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  19. 19. 2. Place the object in liquid -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  20. 20. -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  21. 21. -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL 3. Note difference in water level
  22. 22. The water level changed 15mL We can say the rock displaced 15mL -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  23. 23. It gets better! -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  24. 24. Volume of our rock…
  25. 25. •Can’t use the volume formula (no edges)… •Can’t use the displacement technique….
  26. 26. Steps… First find the MASS: Find the mass of the container = “a” Fill container with water and obtain the mass of both = “b” Find mass of JUST WATER = “b” – “a” Now let’s find the VOLUME: Simply find the volume of the container. Use density formula: D = mass/volume
  27. 27. Density • Today, you will be finding the DENSITY OF several substances: 1. Water 2. A block of wood 3. A rock called granite (a rock that makes up the Earth’s continental crust) 4. A rock called basalt (a rock that makes up the Earth’s oceanic crust) 5. 5 minerals: pyrite, galena, quartz, fluorite, topaz
  28. 28. THE EQUATION D =M V
  29. 29. THE TRICK
  30. 30. Cover up the one you want to solve for!
  31. 31. Let’s solve for VOLUME. “M over D” is remaining so we divide!
  32. 32. Let’s solve for Density. “M over V” is remaining so we divide!
  33. 33. Let’s solve for Mass. “D next to V” is remaining so we multiply!
  34. 34. Density solutions… Water = 1 g/mL3 Wooden Block = .50 g/cm3 Granite = 2.7 g/cm3 Basalt = 3.0 g/cm3