Name:
(4 points)
Date:
Period:
Which Bullet is the same Density?
Problem: Which bullet is the same density as the bullet that committed the crime?
Research: Investigators have measured the mass and volume of the bullet fragments collected
at the crime scene. Using proper search warrants, investigators have collected samples of bullets
from each of four suspects.
Facts.>>>Density is a size ______________ property, so other bullets from the same lot #
must have belonged to the perpetrator. (8 points)
Author:
Title:
Year Published:
Page:
Hypothesis: If we match the density of the bullets collected from the suspects, then we can
determine which suspect had bullets of the same density and thus determine who committed the
crime because density is a characteristic property used to identify substances.
Procedure:
Gather Materials: textbook, writing instrument, balance scales, graduated
cylinder, and “bullets” obtained from the suspects (using proper search warrant).
A. Measure mass by placing each “bullet” (cylinder) on the balance scale. Record the mass in
grams on the data table.
B. Measure volume: Use water displacement method. Show Work Here: (4 points)
1. Measure water first.
2. Add the object. Record the new volume.
3. Subtract to find volume of object Label units.
__________2. Water + object
__________1. Water only
__________3. Volume of object
Write the volume in mL on the data table. All “bullets” (cylinders) are the same size and shape and
thus will have the same volume
C. Determine density by dividing mass by volume. Write the density on the data table.
D. Compare the densities of the “bullets” from the suspects with the density of the bullet fragment
from the crime scene. Which bullet(s) has the same density as the bullet in evidence from the
crime scene? (8 points)
Observations: Label all units. (26 points)
Bullet Source
A. Mass
Crime Scene
6.75 g
Cylinder Light Gray
Cylinder Gray
Cylinder Yellow
Cylinder Rusty Brown
B. Volume
0.9 mL
Evidence and Analysis: (10 points)
Use complete sentences to write a formal statement to support your claim.
Conclusion: (12 points)
P.
H.
C. Density
Little Millie Metric
When making measurements, it is important to use the correct metric units. Read the story
below and fill in the blanks with the right unit. Choose the unit from the following list. Each unit
will be used only once.
Milliliter
Kilogram
Meter
Liter
Millimeter
Kilometer
Gram
Centimeter
Degrees Celsius
Seconds
10 points
It was a Beautiful Day. The temperature was a mild 27 (1)____________. Little Millie
Metric was packing a lunch basket to take to Grandma’s house. She carefully poured 500
(2)____________. of homemade lemonade into a bottle, which she put in the basket. Then she
places 0.5 (3)____________. of cheese, 200 (4)____________. of roast beef, and
several large chocolate chip cookies in the basket. She strapped the basket on the back of her moped
and took a quick check of the gas tank. There were several (5)____________. of gasoline left.
After traveling a little more than 5 (6)____________., Millie discovered she has lost
her way. At the next corner she spotted a very hairy character leaning against a lamppost. He looked
to be only 1.5 (7)____________. tall. He had a wolfish grin and a dark, piercing eyes. He
introduced himself as Mr. W and offered to help Millie.
Mr. W’s directions turned out to be the long way to Grandma’s house. So Millie arrived an
hour late. She let herself in and found Grandma in bed. Grandma did not look well. Had she always
been so hairy? And those ears! “My goodness,” Millie gasped, “what big ears you have, GrandmaAt least 15 (8)____________..” To which Grandma replied, “The better to hear you, my
dear.” Then Millie spotted the teeth. “My, Grandma, What big teeth you have-longer than 25
(9)____________..” This last observation made Grandma very angry. She jumped out of bed
and snarled, “The better to eat you!” Now Millie realized that this was not Grandma, but the hairy
Mr. W!
Unfortunately for Mr. W, Millie held a black belt in karate. In just a few (10)_______..”,
she took care of him! Millie found Grandma in the closet. When they finally sat down to eat lunch,
Millie couldn’t help thinking that maybe next time she’s just have lunch delivered.
Tools and Measurement (10 points)
Before each of the measurements described below write the name of the tool that you would use to obtain that m
measurement. (10 points)
metric ruler
graduated cylinder
triple-beam balance
Celsius thermometer
___________________
1. The mass of a small stone
___________________
6. The air temperature
___________________
2. The length of your finger
___________________
7. The mass of a calculator
___________________
3. The temperature of snow
___________________
8. The volume of a diamond
___________________
4. The mass of a sugar cube
___________________
9. Your height
___________________
5. The volume of a small jar
___________________
10. The mass of a coin
of juice