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Density

m. Density. The measure of how much mass is contained in a given volume. v. I love density. Liquid Layers. Imagine that the liquids on the right have the following densities: 15g/cm 3 10g/cm 3 3g/cm 3 9g/cm 3 7g/cm 3 12g/cm 3

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Density

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  1. m Density • The measure of how much mass is contained in a given volume v I love density

  2. Liquid Layers • Imagine that the liquids on the right have the following densities: • 15g/cm3 10g/cm3 • 3g/cm3 9g/cm3 • 7g/cm3 12g/cm3 • Match the colors to the correct densities. 3g/cm3 7g/cm3 9g/cm3 10g/cm3 12g/cm3 15g/cm3

  3. These four cubes are the same shape and size and therefore have the same volume. They each contain different substances and have different masses.Using logic, place the cubes in order from least to most dense. Oil AIR WATER HELIUM

  4. These four cubes are the same shape and size and therefore have the same volume. They each contain different substances and have different masses.Using logic, place the cubes in order from least to most dense. HELIUM AIR Oil WATER Helium balloons float in air, oil floats on top of water, and our atmosphere is above the water on the Earth’s surface. (Assume liquid water for the blue box.) Density tells us how tightly packed the atoms are within a given volume. This slide is modified from http://www.pbs.org/wgbh/nova/balloon/science/density/filling.html

  5. Will it float in water? Determine if the following shapes will float in water by calculating the density for each item. D = M / V Mass: 15 g Volume: 20 mL Mass: 1000 g Volume: 50 mL Mass: 225 g Volume: 100 mL Mass: 10 g Volume: 200 mL www.middleschoolscience.com 2008

  6. Will it float in water? Determine if the following shapes will float in water by calculating the density for each item. D = M / V Float Float Mass: 15 g Volume: 20 mL Density: 0.75 g/mL Mass: 1000 g Volume: 50 mL Density: 20.0 g/mL Mass: 225 g Volume: 100 mL Density: 2.25 g/mL Mass: 10 g Volume: 200 mL Density: 0.05 g/mL If the density is less than 1.0 g/cm3 then it will float. 1 g/mL = 1 g/cm3=1g/cc www.middleschoolscience.com 2008

  7. Where will it go? Place these objects into the tank of water according to their densities. Density 1.5 g/cm3 Density 0.45 g/cm3 Density 0.99 g/cm3 Density 2.2 g/cm3 www.middleschoolscience.com 2008

  8. Where will it go? Place these objects into the tank of water according to their densities. Density 1.5 g/cm3 Density 0.45 g/cm3 Densities greater than 1 g/cm3 will sink to the bottom. Density 0.99 g/cm3 Density 2.2 g/cm3 www.middleschoolscience.com 2008

  9. These four objects all have the same mass (100g) but each one has a different volume. Using logic and what you know about density, which object would have the lowest density and why?

  10. These four objects all have the same mass (100g) but each one has a different volume. Using logic and what you know about density, which object would have the lowest density and why? D = M / V If the mass is the same for all, a larger volume equals a lower density.

  11. Calculate the mass for the following objects using the formula: Mass = Density x Volume This heart has a density of 5 g/cm3 and has a volume of 100 cm3. What is its mass? This cloud has a volume of 500 cm3 and a density of 2 g/cm3. What is its mass? Don’t forget the units for mass…

  12. Calculate the mass for the following objects using the formula: Mass = Density x Volume 500 g Mass = 5 g 100 cm3 cm3 Mass = 2 g 500 cm3 cm3 1,000 g Don’t forget the units for mass…

  13. Calculate the volume for the following objects using the formula: Volume = Mass/Density This crayon has a density of 1.2 g/cm3 and has a mass of 12 g. What is its volume? This toy car has a mass of 60 g and a density of 2.4 g/cm3. How much space does it occupy? Don’t forget the units for volume…

  14. Calculate the volume for the following objects using the formula: Volume = Mass/Density volume = 12 g 1.2 _g_ cm3 10 cm3 volume = 60 g 2.4 _g_ cm3 25 cm3 Note: g ÷ g/cm3 = g x cm3/g = cm3 Don’t forget the units for volume…

  15. Math Practice:What is the density of a wood block with a volume of 125 cm³ and a mass of 57 g? Density = Mass / Volume Density = 57 g / 125 cm³ Density = 0.46 g/ cm³

  16. Math Practice:What is the density of a liquid with a mass of 45 g and a volume of 48 mL? Density = Mass / Volume Density = 45 g / 48 mL Density = 0.94 g/mL

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