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Density How compact is the material?

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How close the atoms or molecules are to each other More than“heaviness”- density includes how much space an object takes up! All substances have density including liquids, solids, and gases Density is the measure of the “compactness” of a material

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“Compactness”

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Density Density describes how much mass is in a given volume of a material.

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Mass is the amount of matter in an object (usually measured in grams) Volume is the amount of space an object takes up (usually measured in ml or cm 3 )

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Density Equation

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Given: mass = 1500 g; volume = 1700 mL Equation: D = m/v =.88 g/mL Solve: 1,500 g ÷ 1,700 mL = g/mL A solid wax candle has a volume of 1,700 mL. The candle has a mass of 1.5 kg (1,500 g). What is the density of the candle? Word problems

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What do you think? If the volume stays the same and the mass increases... the density will If the mass stays the same and the volume increases... The density will

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The units used for density depend on whether the substance is solid or liquid. ◦For liquids use units of grams per milliliter (g/mL) ◦For solids use density in units of g/cm 3 or kg/m 3. Units for density

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Density of common materials Liquids tend to be less dense than solids of the same material. ◦Ex. solder

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Water is an exception to this rule. The density of solid water (ice) is less than the density of liquid water. Density of common materials

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Reading the Graduated Cylinder Liquids in glass containers curve at the edges This curve is called the MENISCUS

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Reading the Graduated Cylinder Your eye should be level with the top of the liquid You should read to the bottom of the MENISCUS

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What is this reading? 18.0 mL

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What is this reading? 36.5 mL

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What is this reading? 42.9 mL

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What is this reading? 47.0 mL

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What is this reading? 61.2 mL

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