1. Determining Density 3.4 What determines the density of a substance?

2. Density is the ratio of the mass of an object to its volume.
3.4
Determining Density
Density is the ratio of the mass of an object to its volume.

3. 3.4
Determining Density
Each of these 10-g samples has a different volume because the densities vary.
A 10-g sample of pure water has less volume than 10 g of lithium, but more volume than 10 g of lead. The faces of the cubes are shown actual size. Inferring Which substance has the highest ratio of mass to volume?

4. 3.4
Determining Density
Density is an intensive property that depends only on the composition of a substance, not on the size of the sample.

5. 3.4
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.
Because of differences in density, corn oil floats on top of corn syrup.

6. Density and Temperature
3.4
Density and Temperature
Density and Temperature
How does a change in temperature affect density?

7. Density and Temperature
3.4
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.

8. 3.10

9. 3.10

10. 3.10

11. for Sample Problem 3.10

12. 3.11

13. 3.11

14. 3.11

15. for Sample Problem 3.11

16. 3.4 Section Quiz
1. If 50.0 mL of corn syrup have a mass of g, the density of the corn syrup is
0.737 g/mL.
0.727 g/mL.
1.36 g/mL.
1.37 g/mL.

17. 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 g/cm3.
0.500 cm3
2.00 cm3
38.6 cm3
745 cm3

18. 3.4 Section Quiz
3. As the temperature increases, the density of most substances
increases.
decreases.
remains the same.
increases at first and then decreases.

19. END OF SHOW