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© Copyright Pearson Prentice Hall Slide 1 of 25 Density > Determining Density Density is the ratio of the mass of an object to its volume. 3.4

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© Copyright Pearson Prentice Hall Slide 2 of 25 Density > Determining Density Density is an intensive property that depends only on the composition of a substance, not on the size of the sample. 3.4

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© Copyright Pearson Prentice Hall Slide 3 of 25 Density > So, the density for a given substance defines the relationship between mass and volume Like any relationship, it gives you 2 conversion factors For gold, 19.3 g/cm 3 and 1 cm 3 /19.3 g

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© Copyright Pearson Prentice Hall Slide 4 of 25 Density > Determining Density The density of corn oil is less than the density of corn syrup. For that reason, the oil floats on top of the syrup. 3.4

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 5 of A student finds a shiny piece of metal that she thinks is aluminum. In the lab, she determines the metal has a volume of 245 cm 3 and a mass of 612 g. Is this metal aluminum?

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 6 of 25 Well, we can find the density of the material and compare it to the density in the table for aluminum and see if they match. 612 g = 2.50 g 245 cm 3 cm 3 From the table, the density of aluminum is 2.70 g/cm3, so no the metal is not pure aluminum

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Slide 7 of 25 © Copyright Pearson Prentice Hall Density > Density and Temperature Experiments show that the volume of most substances increases as the temperature increases. Meanwhile, the mass remains the same. Thus, the density must change. The density of a substance generally decreases as its temperature increases. 3.4

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© Copyright Pearson Prentice Hall Slide 8 of 25 Practice Problems Problem Solving 3.47 Solve Problem 47 with the help of an interactive guided tutorial. for Sample Problem 3.10

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 9 of

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 10 of

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 11 of

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 12 of

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© Copyright Pearson Prentice Hall Slide 13 of 25 Practice Problems Problem Solving 3.48 Solve Problem 48 with the help of an interactive guided tutorial. for Sample Problem 3.11

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© Copyright Pearson Prentice Hall Slide 14 of Section Quiz 1. If 50.0 mL of corn syrup have a mass of 68.7 g, the density of the corn syrup is a g/mL. b g/mL. c.1.36 g/mL. d.1.37 g/mL.

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© Copyright Pearson Prentice Hall Slide 15 of Section Quiz 2. What is the volume of a pure gold coin that has a mass of 38.6 g? The density of gold is 19.3 g/cm 3. a cm 3 b.2.00 cm 3 c.38.6 cm 3 d.745 cm 3

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© Copyright Pearson Prentice Hall Slide 16 of Section Quiz 3. As the temperature increases, the density of most substances a.increases. b.decreases. c.remains the same. d.increases at first and then decreases.

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© Copyright Pearson Prentice Hall Slide 17 of 25

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