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# C4.1: Density - PowerPoint PPT Presentation

C4.1: Density. Physical Science. C4.1 Density. Supplies: A pencil and science notebook Standards: 8a) Density is mass per unit volume 8b) Calculate the density of substances from measurements of mass and volume 9f) Apply simple mathematic relationships to determine a missing quantity.

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### C4.1: Density

Physical Science

• Supplies: A pencil and science notebook

• Standards:

• 8a) Density is mass per unit volume

• 8b) Calculate the density of substances from measurements of mass and volume

• 9f) Apply simple mathematic relationships to determine a missing quantity

• You will be taking notes using Cornell Notes format or Charting Notes format.

• Definitions

• Density: the mass of matter per unit volume; density is typically expressed in units of grams per milliliter (g/mL), grams per cubic centimeter (g/cm3), or kilograms per cubic meter (kg/m3).

• Population density?

• Forest density?

• Density of stars?

• Air quality?

• Density is a property of matter, like color or size.

• Density is mass per unit volume.

• Given a cubic centimeter of

• Steel

• Water

• Air

• Which has more mass?

• Units are g/cm3

• Ratio means

• 1 g/cm3 = 1000 kg/m3

• Steel at 8.7 g/cm3 is 8,700 kg/m3 (multiply by 1000 and change units.)

• Oak at 600 kg/m3 is 0.60 g/cm3 (divide by 1000 and change units.)

• How does the density of oak compare to the density of water?

• D=m/v

• Solve for m

• Solve for v

• A stainless steel sphere has a mass of 25 grams and a volume of 3.2 cm3. What is the density of the sphere?

• A cube has a mass of 7.8 grams. The length of the sides of the cube is 1.2 cm. What is the density of the cube?

Solve it, then compare

• Honey’s density is 1.4 g/cm3

• Write this as kg/m3

• Sandstone’s density is 20,280 kg/m3

• Write this as g/cm3

• Compare answers with with someone nearby.

Use a graduated cylinder to find the volume (not a beaker – why?)

D = mass/volume

Determining Density

• Read the mark at eye level

• 1 mL = 1 cm3

• Length X width X heights gives cubic centimeters

• What is the volume of a box that is 10” long, 5” wide, and 3” high?

• What is the volume of a box that is 2’ long, 1’ wide, and 9” high?

• Sphere: V=(4/3)πr3

• What is the volume of a sphere with a radius of 2 cm?

• Cylinder: V=πr3h

• What is the volume of a cylinder that is 10 cm tall and has a radius of 3 cm?

• Volume by displacement of fluid

• Remember: 1 mL = 1 cm3

• Fill graduates cylinder with fluid to known level (50 mL)

• Carefully slide object down the side of the cylinder

• Compute the increase in the fluid height

• 82 mL - 50 mL = 32 mL

• 32 mL = 32 cm3

• I fill a graduated cylinder with 50 mL of water.

• I slip a stone into the cylinder and the water raises to 62 mL.

• What is the volume of the stone?

• Mass of each atom or molecule that that makes up the substance – a calcium atom has more ‘stuff’ in it than an oxygen atom.

• How tightly the atoms are packed -- the atoms are closer together in diamond that in graphite, but both are carbon.

• (Except for water) solids are more dense than liquids

• Liquids are more dense than gases

• Which has more mass, a pound of bricks or a pound of feathers?

• Which is more dense, a pound of bricks or a pound of feathers.