1.
Conduct experiment to analyzing the density of
pennies.
2.
Clearly state the problem you are going to
investigate for all three parts; A, B, and C.
Remember to include a clear identification of the independent and
dependent variables that will be studied.
3.
Take notes on this handout. Each student is responsible for completing a
formal lab report.
4.
Complete a typed, formal lab report following the
guidelines in the handout entitled “Lab Report Format”. Tables, charts and/or graphs should be used
where appropriate. Do not just use your
notes on this handout! For this lab, NO
COMPUTER GENERATED GRAPHS.
5.
Answer the Analysis and Conclusions Questions, and
include them in you lab report.
Triple beam
balance
100 ml graduated
cylinders
Paper clips
Pennies
Water
Reference
materials to explore the minting of coins and density of metals
Part A:
1.
Determine
mass of 5 paper clips,
then 10 paper clips, then 15 paper clips, then 20 paper clips.
2.
Determine
the mass of 5 pennies, then 10 pennies, then 15 pennies, then 20 pennies.
3.
Record your
data on the table on page 2.
4.
Graph graph both sets of data you gathered on the paper clips and
pennies. Note any differences.
Part B: Pre1982 Pennies
5.
If using glass graduated cyclinders
 Put on your safety goggles! Pour 30 to 40 mL of
water into a 100 mL graduated cylinder. Record the volume of the water in the
cylinder on the data table on page 2.
Leave the water in the cylinder.
6.
Using the
balance, determine and record the mass of four (4) pre1982 pennies.
7.
Slide the
four pre1982 pennies into the graduated cylinder, being careful not to splash
any water. Record the volume of the
water plus pennies.
8.
Subtract the
original volume to determine the amount by which the volume changed when you
added the five pennies. Record this
amount as the volume of the four pre1982 pennies. This is known as displacement volume.
9.
Use the
formula D=m / V to determine the density of the four pennies. Record the density.
10.
Take four more pre1982 pennies, and determine their
mass. Add this mass to the mass in step
#6.
11.
Add these 4 additional pennies to the graduated
cylinder carefully, and determine the displacement volume. Repeat steps 89.
12.
Take four more pre1982 pennies; and repeat steps
1011 for a total of 12 pennies.
13.
Remove the pennies and the water from the graduated
cylinder, and dry them off for storage.
Part C:
Post1982 Pennies
1.
Repeat steps
513 using post1982 pennies.
2.
Plot the
data for the mass and volume of the pre1982 pennies and post1982 pennies on a
graph. Draw a straight line on the graph
that come as close as possible to most of the points.
Analysis and Conclusions:
1.
Describe the
graph of the paper clips.
2.
Was the
first graph of the pennies, weighed in step two similar? Explain.
3.
From your
graph, what is the difference between the pre and post1982 pennies?
4.
Research the
minting of pennies, and explain the difference you found through
experimentation.
5.
On the last
graph, draw and label a line for the density of copper. (You need to research
the density of copper. Remember to use
metric units).
6.
On the last
graph, draw and label a line for the density of zinc.
7.
Draw some
conclusions about your graph.
Paper Clips 
Mass (g) 
Pennies 
Mass (g) 
5 

5 

10 

10 

15 

15 

20 

20 

Data Table for Pre1982 Pennies
Quantity 
Mass of pennies (g) 
Starting volume in cylinder (mL) 
Volume of water and pennies (mL) 
Volume of pennies (mL) 
Density of pennies (g/mL) 
4 





8 





12 





Data Table for Post1982 Pennies
Quantity 
Mass of pennies (g) 
Starting volume in cylinder (mL) 
Volume of water and pennies (mL) 
Volume of pennies (mL) 
Density of pennies (g/mL) 
4 





8 





12 





HINT FOR GRAPHING….
THE VOLUME (mL)
is on the X axis, and the MASS (g) is on the Y axis, because
the formula is Density = mass/volume