1. Density- notes page 21
Essential Question: How do we explain density?

2. Density Density= Mass/Volume 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

3. Density
How do we find mass?
How do we find volume?

4. Density How do we find mass? How do we find volume? 1 mL= 1 cm3
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)

5. 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.

7. Density Practice

8. 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)
______ _______
______ _______
______ _______
______ _______
Substance
Density (g/cm3)
gold
19.3
Mercury
13.5
Lead
11.4
Iron
7.87
Aluminum
2.7
Bone
Gasoline
0.66 – 0.69
Air (dry)

9. 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)
g/cm Lead
g/cm3 Aluminum
g/cm3 Bone
g/cm3 Gasoline
Substance
Density (g/cm3)
gold
19.3
Mercury
13.5
Lead
11.4
Iron
7.87
Aluminum
2.7
Bone
Gasoline
0.66 – 0.69
Air (dry)

10. 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 4. Is the liquid in Cup #1 more dense or less dense than Cup #2?