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**Understanding the relationship of Mass and Volume**

Take out your density HW assignment! NOW! Seriously, stop talking and take out the thing!

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**Density The relationship between mass and volume is called density.**

To find density, divide mass by volume Density = mass/volume D= 1 ml is equal to 1 cm3

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**Density of pure materials**

The density of water is 1 g/cm3 This means that the ratio of volume to mass for water is always 1 to 1. An object composed entirely of copper would have a density of 8.92 g/cm3 An object composed entirely of aluminum would have a density of 2.7 g/cm3

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Practice Problems A platinum bar measures 5.0 cm long, 4.0 cm wide, and 1.5 cm thick. It has a mass of grams. Calculate the volume of the platinum bar. Calculate the density of the platinum bar. A lead cylinder has a mass of 540 grams and a density of 2.70 g/ml. Calculate the volume of the lead cylinder. A cork has a mass of 3 grams and a volume of 16 cm3. Calculate the density. A thin glass bottle holds 25 ml of liquid and has a mass of 19 grams. Calculate the density.

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Density problems…. A sheet of metal is 2 mm wide, 10 cm tall, and 15 cm long. It was 4 grams. What is the density? A pencil has a density of .875 g/ml. It has a mass of 3.5 grams. What is the volume? Find the mass of a 50.0 ml quantity of water if the density of water is 1.00 g/ml. If the density of 45.0 cm3 block of wood is 0.65 g/ml calculate the wood’s mass.

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