# Laboratory Science Foundations

Laboratory Science Foundations

Density practice problems

1. Calculate the density of mercury if 1.00 ´ 102 g occupies a volume of 7.36 cm3.

2. Calculate the mass of 65.0 cm3 of mercury.

3. A piece of lead has a mass of 22.7g. It occupies a volume of 2.00 cm3. What is the density of

the lead?

4. A piece of lead occupies a volume of 4.00 cm3. What is the mass of this piece of lead?

5. A piece of lead has a mass of 422.8 g. What volume does it occupy?

6. A student needs 15.0 g of ethanol for an experiment if the density of the alcohol is .789 g/mL,

how many milliliters of alcohol are needed?

7. A certain sodium chloride solution has a density of 1.033 g/mL. What is the mass of 120. L

of this solution?

8. An iron bar has a density of 7.00 g/cm3 and a mass of 431. g. What is the volume of this

piece of iron?

9. A sample of gold occupying a volume of 3.00 cm3 has a mass of 57.9 g. What is the density

of gold?

10. The density of silver is 10.5 g/cm3. What will be the volume of a piece of silver having a

mass of 31.5 g?

11. A cube of metal has a mass of 1.45 Kg and displaces 542 mL of water when immersed.

Calculate the density of the metal.

12. Iron has a density 7.87 g/cm3. If 52.4 g of iron is added to 75.0 mL of water in a graduated

cylinder, to what volume reading will the water level in the cylinder rise?

13. The density of pure silver is 10.5 g/cm3. If 5.25 g of pure silver is added to a graduated

cylinder filled with 50.0 mL of water, to what volume reading will the water level in the

cylinder rise?

14. A sample of a liquid solvent has density .915 g/mL. What is the mass of 85.5 mL of the

liquid?

15. Mercury has a density of 13.6 g/mL. What volume of mercury must be taken to obtain 225.

grams of the metal?

Substance / Density(g/mL) / Substance / Density(g/mL) / Substance / Density(g/mm3)Gold / 19.3 / Water / 1.00 / Air / 1.29

Lead / 11.3 / Gasoline / 0.67 / Oxygen / 1.43

Copper / 8.92 / Milk / 1.03 / Hydrogen / 0.090

Iron / 7.86 / Sea Water / 1.03 / Helium / 0.178

Aluminum / 2.70 / Blood / 1.06 / CO2 / 1.96

Salt / 2.16 / Mercury / 13.6

Paper / 0.70 / Olive oil / 0.92

Balsa / 0.20 / Alcohol / 0.79

Redwood / 0.44 / Vinegar / 1.01

Rubber / 1.1 / Ether / 0.70

Ice / 0.92 / CCl4 / 1.59

Glass / Chloroform / 1.483

16. A piece of pure unknown metal has a mass of 46.5 g and a volume of 5.3 cm3. What is the

density of this metal? Could this metal be gold?

17. A sample of lead and a sample of aluminum have equal volumes. How does the mass of the

lead sample compare with that of the aluminum sample?

18. A student finds that 23.50 mL of a substance has a mass of 35.062 g. What is the substance?

19. You have a 1.0 cm3 sample of lead and a 1.0 cm3 sample of glass. You drop each in a

separate beaker of water. How do the volumes of water that are displaced by the samples

compare? Explain.

20. Compare the volume of one kilogram of lead and one kilogram of water.

21. Compare the masses of 5 mL of alcohol and 5 mL of milk.

22. Which would have a bigger volume, 300 g of air or 300 g of oxygen?

23. Which of the solid objects would float in chloroform?