 # Density Homework

Calculate density, and identify substances using a density chart.
Density is a measure of the amount of mass in a certain
volume. This physical property is often used to identify and
classify substances. It is usually expressed in grams per cubic
centimeters, or g/cm3. The chart on the right lists the densities
of some common materials.

EQUATION: density = mass / volume
D=m/V

SAMPLE PROBLEM: What is the density of a billiard
ball that has a volume of 100 cm3 and a mass of 250 g?
D = 250 g / 100 cm3

D = 2.5 g/cm3

1. A loaf of bread has a volume of 2270 cm3 and a mass of 454 g. What is the density of

2. A liter of water has a mass of 1000 g. What is the density of water?
(Hint: 1 mL = 1 cm3)

3. A block of wood has a density of 0.6 g/cm3 and a volume of 1.2 cm3. What is the
mass of the block of wood? Be careful!

4. Use the data below to calculate the density of each unknown substance. Then use the
density chart to determine the identity of each substance.

Density
Substance        (g/cm3)

Gold                   19.3
Mercury             13.5
Iron                    7.87
Aluminum           2.7
Bone                  1.7–2.0
Gasoline             0.66–0.69
Air (dry)             0.00119

Mass (g)         Volume (cm3)          Density (g/cm3)                 Substance
Example:
4725                350                        4725/350 = 13.5                  mercury
a. 171                 15
b. 108                 40
c. 475                250
d. 680               1000