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DENSITY

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**There are three states of matter:**

solid liquid gas

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**Density – the amount of matter that occupies space**

Solids Liquids Gas Molecules close together Molecules spread out further Molecules spread far apart

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**To determine density, you must divide the mass by the volume.**

D = m÷v

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**Mass is measured in grams using a triple beam balance…**

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or a digital scale.

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**We can determine the mass of the box using the digital scale.**

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**Volume of a regularly-shaped object can be measured using a ruler.**

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If the object has smooth sides where a ruler can be used to measure the length, width, and height, it is considered regular-shaped.

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**Volume = length x width x height**

2 cm 5 cm 15 cm

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V = l x w x h V = 15 cm X 5 cm X 2 cm V = 150 cm3

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**Determine the volume of the cube.**

3 cm

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V = l x w x h V = 3 cm X 3 cm X 3 cm V = 27 cm3

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**Volume of a liquid is measured in mL using a graduated cylinder or a beaker.**

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**Objects that do not have smooth sides to measure are called irregular-shaped.**

To measure the volume of these objects we use water displacement.

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10 20 30 40 50 Water is put into a graduated cylinder and the volume of the water is measured.

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**The object is placed in the graduated cylinder.**

50 40 30 The volume of the water and the object is determined. 20 10

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**The first volume is subtracted from the second volume.**

40 mL – 29 mL = 11 mL The volume of the object is 11mL.

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**Density does not depend on the amount of the substance.**

The density of the block is 16 g/cm3

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**If it is cut in half, what happens to the density?**

Density of block is 16 g/cm3 Density of block is 16 g/cm3

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**Sulfur Hexafluoride & Density**

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**Sulfur Hexafluoride & Density**

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**The density of water is 1g/mL.**

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**If an object with a density of less than 1g/mL is placed in the water, it will float.**

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**If an object with a density of greater than 1g/mL is placed in the water, it will sink.**

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**Can you give an estimation of the density of the alcohol and the oil?**

DENSITY COLUMN Can you give an estimation of the density of the alcohol and the oil? Water Density = 1g/mL Oil Alcohol

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DENSITY COLUMN The density of the oil is less than 1 g/mL. The density of the alcohol is less than the density of the oil. Water Density = 1g/mL Oil Alcohol

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**Estimate the density of the piece of wood.**

DENSITY COLUMN Estimate the density of the piece of wood. Alcohol Density = .75 g/mL Oil Density = .96 g/mL The density of wood is .8 g/cm3. Water Density = 1g/mL

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**Estimate the density of the piece of ice.**

DENSITY COLUMN Estimate the density of the piece of ice. Alcohol Density = .75 g/mL Oil Density = .96 g/mL The density of ice is g/cm3. Water Density = 1g/mL

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