Density 3.4

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Density 3.4

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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.

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Density >

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Determining Density

Determining Density

What determines the density of a substance?

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Density > Determining Density

Density is the ratio of the mass of an object to its volume.

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Each of these 10-g samples has a different volume because the densities vary.

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Density is an intensive property that depends only on the composition of a substance, not on the size of the sample.

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The density of corn oil is less than the density of corn syrup. For that reason, the oil floats on top of the syrup.

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Simulation 1

Rank materials according to their densities.


Density >

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Density and Temperature

Density and Temperature

How does a change in temperature affect density?

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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.

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SAMPLE PROBLEM

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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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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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Section Quiz

-or-Continue to: Launch:

Assess students’ understanding of the concepts in Section

Section Assessment

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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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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/cm3.

a. 0.500 cm3

b. 2.00 cm3

c. 38.6 cm3

d. 745 cm3


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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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Density > Concept map

Concept Map 3

Solve the Concept Map with the help of an interactive guided tutorial.

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Density 3.4

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