 Attendance
 Coke vs. Diet Coke
 Correct 12.1A Density Homework (white)
 Discuss Lab 12A
 Use water displacement tanks to find volume
 Learning Targets:
 Find volume of an object using water displacement.
 Apply the formula: D = M/V
 Examine variations in densities of matter in different states.

Date
4/7
4/8
4/12
4/14
4/19
4/20
4/25
4/27
Topic
Matter Web Quest
Particle Theory of Matter
The Atom/MCA Testing
States of Matter
Physical Properties of Matter
Oobleck!
49
Density
Density (continued)
Page
47
48
50
51
52
53
54

Density (cont) 4/27/11
54
Summary:

How do you find the density of an object?
What is the formula for density?
Density = Mass
Volume
How can we find out the volume of the bottles?
How do we find the mass of the bottles?
What might cause the density of the sodas to be so different ?
Sink or Float?

12.1 Density
1. A solid rubber stopper has a mass of 33.0 grams and a volume of 30.0 cm 3 . What is the density of the rubber?
Density = Mass
Volume
Density = 33.0
30.0
= 1.1 gr/cm 3

2. A chunk of paraffin (wax) has a mass of 50.4 grams and a volume of 57.9 cm 3 . What is the density of paraffin?
Density = Mass
Volume
Density = 50.4
57.9
= 0.87 gr/cm 3

3. A marble statue has a mass of 6,200 grams and a volume of 2,296 cm3. What is the density of marble?
Density = Mass
Volume
Density = 6,200
2,296
= 2.7 gr/cm 3

4.
4a-b.
Full Box = 120.8 kg
Empty = 0.755 kg
120.8 kg - 0.755 kg =
120 kg of plastic
120 kg
0.125 m 3
= 960 kg/m 3
Type of Plastic = HDPE

b.
HDPE, LDPE, PP, PS

Check your answers. How close are you?
Make changes to your table as needed.

Compare the answer in the “mass” column with your answer. Make changes as needed. You will also have to recalculate each density.

Compare the density of each material against water = 1 g/cm 3 .
If the density is greater than water the material should sink.
If the density is less than water the material should float.

Archimedes was born in
Greece in 287 B.C.

How do you use a displacement tank to measure the volume of a cube?
• Find the volume of each cube by using the water displacement technique.
• Compare your results with those you obtained using the mathematical formula (see Table 2).
• How close are your answers?
•Answer the questions for Challenge 5d on the last page of your lab packet.

• Summary :
• Homework:
• Flipper:
You have found volume of objects using two different methods
(formula and water displacement).
Describe each method. Which technique do you prefer? Why?
None Today!
12A lab goes back to spread #53