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Density- Cornell notes page 125

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Density Physical property of matter amount of matter in a given amount of space. (amount of matter is called “mass,” and amount of space an object takes up is called “volume”) Density= Mass/Volume http://www.youtube.com/watch?v =FSupQZQqaPk

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Density How do we find mass? How do we find volume?

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Density How do we find mass? – triple beam balance, scale How do we find volume? – multiply length, width, and height – use displacement method 1 mL= 1 cm 3 (centimeter cubed/cubic centimeter= cc )

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Density Water has a given density of 1g/mL Things that are less dense will float on water. Things that are more dense will sink.

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Back to the Egg… 1. Did the egg change? 2. In Cup #1 is the egg more dense or less dense than the liquid? 3. In Cup #2 is the egg more dense or less dense than the liquid? 4. Is the liquid in Cup #1 more dense or less dense than Cup #2?

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Density Practice Copy and complete on page 125 in science notebook

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Density Practice Use the data below to calculate the density of each unknown substance. Then use the density chart to determine the identify of each substance. MassVolume DensitySubstance (g)(cm3) (g/cm3) a.17115 ______ _______ b.10840 ______ _______ c.475250 ______ _______ d.6801000 ______ _______ SubstanceDensity (g/cm3) gold19.3 Mercury13.5 Lead11.4 Iron7.87 Aluminum2.7 Bone1.7- 2.0 Gasoline0.66 – 0.69 Air (dry)0.00119

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Density Practice Use the data below to calculate the density of each unknown substance. Then use the density chart to determine the identify of each substance. Mass Volume DensitySubstance (g) (cm3) (g/cm3) a.17115 11.4g/cm3 Lead b.10840 2.7g/cm3Aluminum c.475250 1.9g/cm3 Bone d.6801000 0.68g/cm3 Gasoline SubstanceDensity (g/cm3) gold19.3 Mercury13.5 Lead11.4 Iron7.87 Aluminum2.7 Bone1.7- 2.0 Gasoline0.66 – 0.69 Air (dry)0.00119

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