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Density A quantitative physical property

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Density At the conclusion of our time together, you should be able to: 1.Define density 2.Calculate the density of a given object if given the volume and mass 3.Calculate the volume or mass if the density is given with the volume or mass

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Definition Density is defined as mass per unit volume It is the amount of matter within a certain volume Density = mass volume Units = g/mL (liquid) OR g/cm 3 (solid)

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Which one is more dense?

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► Which is heavier, a kilogram of feathers or a kilogram of bricks? ► Which takes up more space? ► If two objects have the same mass, the one with the higher density will take up less space. Neither Feathers

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Which is heavier, a liter of water or a liter of mercury? If we have equal volumes of two different substances, then the one with the greater density will have the greater mass. Water has a density of 1.0 g/ml and mercury (Hg) has a density of 13.6 g/ml.

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Density Calculations Example 1: A chunk of silver has a mass of 21.0 g and a volume of 2.00 cm 3. What is the density of silver? Set up your density problems as shown on the handout: Given: m = 21.0 g V = 2.00 cm 3 Required: D

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Density Calculations Example 1: A chunk of silver has a mass of 21.0 g and a volume of 2.00 cm 3. What is the density of silver? Analysis: D = m V Solution: D = 21.0 2.00 cm 3 D = 10.5 g/cm 3 Paraphrase: The density of silver is 10.5 g/cm 3.

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Density Calculations Example 2: The density of lead is 11.35 g/cm 3. Determine the mass of a cube of lead with sides 2.5 cm long.

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Density Calculations Example 3: What is the volume of a solid that has a mass of 5.00 X 10 4 mg and a density of 55 g/cm 3 ?

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Density Calculations m DV Cover up whatever unit you are solving for, the two units remaining will show you how to solve the problem.

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Homework – pg. 25 # 1 – 5 Let’s see if you can: 1.Define density 2.Calculate the density of a given object if given the volume and mass 3.Calculate the volume or mass if the density is given with the volume or mass

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