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Slide 1 of 25 Density 3.4

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© Copyright Pearson Prentice Hall Slide 2 of 25 Density If you think that these lily pads float because they are lightweight, you are only partially correct. The ratio of the mass of an object to its volume can be used to determine whether an object floats or sinks in water. 3.4

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© Copyright Pearson Prentice Hall Density > Slide 3 of 25 Determining Density What determines the density of a substance? 3.4

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© Copyright Pearson Prentice Hall Slide 4 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 5 of 25 Density > Determining Density Each of these 10-g samples has a different volume because the densities vary. 3.4

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© Copyright Pearson Prentice Hall Slide 6 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 7 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 Slide 8 of 25 Density > Determining Density Simulation 1 Rank materials according to their densities.

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© Copyright Pearson Prentice Hall Density > Slide 9 of 25 Density and Temperature How does a change in temperature affect density? 3.4

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Slide 10 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 SAMPLE PROBLEM Slide 11 of 25 3.10

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 12 of 25 3.10

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 13 of 25 3.10

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 14 of 25 3.10

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© Copyright Pearson Prentice Hall Slide 15 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 16 of 25 3.11

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 17 of 25 3.11

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 18 of 25 3.11

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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 19 of 25 3.11

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© Copyright Pearson Prentice Hall Slide 20 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 21 of 25 Section Quiz -or- Continue to: Launch: Assess students’ understanding of the concepts in Section Section Assessment 3.4

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© Copyright Pearson Prentice Hall Slide 22 of 25 3.4 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.0.737 g/mL. b.0.727 g/mL. c.1.36 g/mL. d.1.37 g/mL.

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© Copyright Pearson Prentice Hall Slide 23 of 25 3.4 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.0.500 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 24 of 25 3.4 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 25 of 25 Density > Concept map Concept Map 3 Solve the Concept Map with the help of an interactive guided tutorial.

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