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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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Presentation on theme: "© 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."— Presentation transcript:

1 © 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

2 © 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

3 © 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

4 © 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

5 © 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?

6 © 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

7 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

8 © 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

9 © Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 9 of

10 © Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 10 of

11 © Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 11 of

12 © Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 12 of

13 © 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

14 © 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.

15 © 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

16 © 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.

17 © Copyright Pearson Prentice Hall Slide 17 of 25


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