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

Your Turn!

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

the bread?

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.

** DensitySubstance (g/cm3)**

Gold 19.3

Mercury 13.5

Lead 11.4

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