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Published byMargaretMargaret Harris Modified over 6 years ago
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Volume
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Irregular Shapes
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To measure the volume of an irregularly shaped object
(Like a rock)
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3. Record the volume of water.
1. Get a graduated cylinder in which the irregular object will easily fit. 140 2. Pour water into the cylinder to a specific amount (in this example: to 80 mL). 100 80 mL 60 3. Record the volume of water. 20
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4. Drop the object gently into the cylinder.
140 5. Record the new volume. 120 mL 100 80 mL 6. Subtract the old volume from the new volume. 40 mL 60 20 -or- -or-
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Determining Mass
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Mass is defined as Sponge Rock
a measurement of the amount of matter in an object.
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Baseball and tennis balls have about the same volume.
That is, they take up about the same amount of space.
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But if you pick them up, you notice a difference.
The baseball has more mass.
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A block of aluminum and a block of silver look very similar.
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The Aluminum and Silver have properties in common and properties that make them different.
Property Aluminum Silver Volume 216 cm3 216 cm3 Luster shiny shiny Electrical conductor poor good Heat Conductor good good Phase of matter solid solid Color silver silver Atomic Mass 27 108 Kinds of Atoms Aluminum Silver Atomic Number 13 47 Melting Point 660ºC 962ºC Boiling Point 2467ºC 2162ºC
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One property that makes aluminum different from silver is the property of
Density
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the mass of a substance per unit of volume.
Density is defined as the mass of a substance per unit of volume.
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Wood Plastic Metal These three blocks have the same volume,
but their masses are different.
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Formula for Density M DV Density = Mass/Volume or
Mass = Density X Volume or Volume = Mass/Density
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To Calculate Density 1. Determine the volume of the object.
20 60 100 140 80 mL 120 mL 40 mL 2. Record the volume in mL. (1 mL = 1 cm3) 3. Determine the mass of the object. 4. Divide mass by volume to determine density. (g/mL or g/cm3)
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Density of Common Items
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Let’s Practice! What is the density of a piece of iron that has a mass of 59.8g and a volume of 2.08 cm3? M DV
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Granite has a density of 4. 67 g/cm3. What is the mass of 46
Granite has a density of 4.67 g/cm3. What is the mass of 46.8 cm3 of granite? M DV
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Copper has a density of 4. 44 g/cm3. What is the volume of 2
Copper has a density of 4.44 g/cm3. What is the volume of 2.78g of copper? M DV
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Corn oil has density of 6. 89 g/cm3. What is the mass of 34
Corn oil has density of 6.89 g/cm3. What is the mass of 34.0 cm3 of corn oil? M DV
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Mercury metal is poured into a graduated cylinder that holds exactly 22.5 mL. The mercury used to fill the cylinder weighs g. From this information, calculate the density of mercury. M DV
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28. 5 g of iron shot is added to a graduated cylinder containing 45
28.5 g of iron shot is added to a graduated cylinder containing mL of water. The water level rises to the mL mark, From this information, calculate the density of iron. M DV
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Find the mass of 250. 0 mL of benzene. The density of benzene is 0
Find the mass of mL of benzene. The density of benzene is g/mL. M DV
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