Density- Cornell notes page 125

Density • Physical property of matter• amount of matter in a given

amount of space.• (amount of matter is called

“mass,” and amount of space an object takes up is called “volume”)

• Density= Mass/Volume• http://www.youtube.com/watch?

v=FSupQZQqaPk

Density • How do we find mass?

• How do we find volume?

Density • How do we find mass?– triple beam balance, scale

• How do we find volume?– multiply length, width, and height– use displacement method

• 1 mL= 1 cm3 (centimeter cubed/cubic

centimeter= cc)

Density • Water has a given density of 1g/mL

• Things that are less dense will float on water.

• Things that are more dense will sink.

Back to the Egg…

1. Did the egg change?2. In Cup #1 is the egg more dense or less dense than the liquid?3. In Cup #2 is the egg more dense or less dense than the liquid?4. Is the liquid in Cup #1 more dense or less dense than Cup #2?

Density Practice

Copy and complete on page 125 in science notebook

Density PracticeUse the data below to calculate the

density of each unknown substance. Then use the density chart to determine the identify of each substance.Mass Volume Density Substance(g) (cm3) (g/cm3)

a. 171 15 ______ _______b. 108 40 ______ _______c. 475 250 ______ _______d. 680 1000 ______ _______

Substance Density (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

Density PracticeUse the data below to calculate the

density of each unknown substance. Then use the density chart to determine the identify of each substance.Mass Volume DensitySubstance(g) (cm3) (g/cm3)

a. 171 15 11.4g/cm3 Leadb. 108 40 2.7g/cm3 Aluminumc. 475 250 1.9g/cm3 Boned. 680 1000 0.68g/cm3 Gasoline

Substance Density (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