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Density

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Computing Density Density = mass (g) volume (cm 3 ) DETERMINE VOLUME: DETERMINE MASS: RT = Pg. 1

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Computing Density DETERMINE VOLUME: Another way to determine volume is to measure the height, length and width of a solid that is cubic or rectangular in design. The formula shown will determine the volume of the object.

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Sample Density problem #1 A student determines the mass of a rock sample to be 156.3 g. The volume of the same rock sample is 51.3 cm 3. What is the density of the rock sample? Density = mass (g) volume (cm 3 )

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Sample Density problem #2 Given the information provided, determine the density of the toy? Mass of Toy Dinosaur = 10 g Volume of Toy Dinosaur = ? Density = mass (g) volume (cm 3 )

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Determining Relative Density The densities of objects in gases and fluids can be determined by observing the “flotation” of the object in the fluid or gas Density of helium gas = 0.2 g/cm 3 Density of air= 1.2 g/cm 3 Objects with lower densities than the fluid or gas they are in will float above objects with higher densities.

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Liquid water has a density of 1.0 g/mL. Determine the relative densities of the objects in the glasses of water. Determining Relative Density

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Physical Changes That Affect Density If temperature of a gas increases while pressure is constant… Changes in temperature and pressure can change the densities of substances …. especially gases. Example: Air that is heated is less dense than air that is cooled. Therefore, heated air will rise above cooled air.

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Physical Changes That Affect Density Changes in temperature and pressure can change the densities of substances …. especially gases. If temperature of a gas decreases while pressure is constant… Example: Air that is cooled is more dense than air that is heated. Therefore, cooled air will sink below heated air.

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Physical Changes That Affect Density Changes in temperature and pressure can change the densities of substances …. especially gases. If the pressure on a gas increases while the temperature is constant… Pressure

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Phases of Matter and Density Matter on Earth exists in three phases: solid, liquid, gas. Liquid Iron = 7.2 g/cm 3 Solid Iron = 7.8 g/cm 3 Ice = 0.97 g/cm 3 Liquid Water = 1.0 g/cm 3

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Density vs. Object Size and Shape The density of an object will NOT change should an object change its size and/or shape. Quartz crystal: Mass = 10.9 g Quartz globe: Mass = 88..9 g Density of quartz 2.6 g/cm 3

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