Measurement of Density
Name ____________________________
Instructor __________________ Section ________ Partner _____________________
Part 1: Density of Regular Object (½ point for each data entry, 1 point for each volume and density)-Entire table is 25pts
Table 1.
Unknown Code:
__________
Sample 1
Sample 2
Sample 3
Sample 4
Length (cm)
Width (cm)
Height (cm)
Calculated
Volume (cm3)
Mass -Triplebeam balance (g)
Mass – pocket
balance (g)
Mass - Analytical
Balance (g)
Density (g/cm3)
Average density of the blocks ________________________ (2 points)
Sample 5
Show one sample calculation for the determination of the volume and density of one of the
blocks. (6 points)
Part 2: Density of a Liquid
Volume of water in 400 mL beaker _________________ (1 point)
Volume of water in 400 mL beaker as measured with a graduated cylinder
Volume 1
_________________
Volume 2
_________________
Total Volume _________________ (2 points)
Which instrument is more precise (beaker or graduated cylinder)? (2 points)
Give an explanation for your answer. (3 points)
Table 2. (½ point for each data entry, 1 point for each mass and density)-Entire table is 8pts
Unknown liquid code _______________
Mass of the empty Erlenmeyer flask (g)
Mass of the Erlenmeyer flask containing the 10.00
mL of liquid (g)
Mass of 10.00 mL of the unknown liquid (g)
Calculated Density (g/mL)
Trial 1
Trial 2
Show the calculation for the density of the liquid: (4 points)
Average Density of the liquid ____________ (2 points)
Part 3: Density of an Irregular Object (1 point for each data entry, 2 points for the density)
Description of Object:
Unknown Code:
Mass of Weigh Boat
_________________
Mass of Weigh Boat and Object
_________________
Mass of Object
_________________
Initial Volume of Graduated Cylinder
_________________
Final Volume of Graduated Cylinder
_________________
Volume of Unknown
_________________
Density of Unknown (Show calculation)
_________________
(4 points)
Part 4: What does “density” mean?
Rank the solids in the graduated cylinder in Figure 2B from most dense to least dense. (3 points)
Rank the liquids in the graduate cylinder in Figure 2C from most dense to least dense. (5 points)
Discussion questions (5 points each)
1. How did using the three different balances for mass affect the density values that were
calculated?
2. Were the differences in the mass measurements due to accuracy or precision differences? How
do you know?
3. What determines the number of significant figures when recording data from a graduated
cylinder?
4. A solid had a measured mass of 4.15 g. When added to water, the volume of the water
changed from 15.40 mL to 21.2 mL. What is the density of the solid?
5. Find the thickness of a sheet of tin foil (in millimeters) that measures 50.0 cm by 50.0 cm
with a mass of 45.5 g. The density of tin metal is 7.25 g/cm3. (5 points)