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 Practice
Use 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 Practice
Use 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
11.4g/cm3 Lead
b. 108
40
2.7g/cm3 Aluminum
c. 475
250
1.9g/cm3
Bone
d. 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