Mass, volume, and density of regularly and irregularly shaped objects
Mass, volume, and density of regularly and irregularly shaped objects
Grade Levels
Course, Subject
Description
Objectives: Name ____________________________________
- Use a balance to determine the mass of regularly and irregularly-shaped objects.
- Use water displacement and direct measurement to determine the volume of regularly
shaped-objects using both direct measurements and water displacement.
- Use water displacement to determine the volume of irregularly shaped objects.
- Determine when to use direct measurement and when to use water displacement to calculate volume.
- Calculate the density of regularly and irregularly-shaped objects.
- Accurately record data from a laboratory experience to data tables.
- Use reasoning skills and observations to determine identities of objects.
Rationale
1. Characteristic properties of a substance are those that never change for that substance. For each of the following, state whether or not you think it is a characteristic property of the object and why you answer as you do.
a. mass – characteristic property? Yes or no (circle one). Why or why not?
b. volume - characteristic property? Yes or no (circle one). Why or why not?
c. density - characteristic property? Yes or no (circle one). Why or why not?
2. If the two objects had the same length, width, height, and shape, why were they not the same density?
3. If two similar objects have different masses will their densities differ also?
Resource
Part A. Regularly-shaped objects.
*Note – Read all steps before starting any work.
1. Be sure to zero (tare) the scale before placing the cube on the balance. Measure the mass (in grams) using the balance. Record data in data table.
2. Measure the length, width, and height of the aluminum cubes (in cm). Record data in data table.
3. Calculate volume (l x w x h). Record data in data table
4. Carefully place 50 ml of water in the 100 ml graduated cylinder. Note that 50 ml is recorded on the data table as “initial volume”.
5. Place the aluminum cube in the graduated cylinder. If it floats, use the wooden rod to carefully submerge the cube (simply push the cube under the water just until the entire cube is submerged). Read the volume measurement (in ml) of the graduated cylinder and record under as the “final volume”.
6. Remove the cube from the cylinder (you can pour the water into the beaker to help). Dry the cube.
7. Determine the cube’s volume using water displacement (subtract the initial volume from the final volume) and record the answer on the data table.
8. Determine the aluminum cube’s density (D = m/v) and record the answer on the data table.
9. Repeat all steps for the steel cube.
A. Data Table
Object |
Mass (g) |
Volume (measured = l x w x h) (cm3) l (cm) w (cm) h (cm) volume (cm3) |
Density (D = m/v) [using measured volume} |
Volume (water displacement) (ml) Final vol (ml) Initial vol (ml) Object’s volume (ml) |
Density (D = m/v) {using water displacement volume} |
Aluminum Cube |
|
|
|
50 ml |
|
Steel Cube |
|
|
|
50 ml |
|
Questions:
1. Characteristic properties of a substance are those that never change for that substance. For each of the following, state whether or not you think it is a characteristic property of the object and why you answer as you do.
a. mass – characteristic property? Yes or no (circle one). Why or why not? __________________________________________________________
_______________________________________________________________________________________________________________________
b. volume - characteristic property? Yes or no (circle one). Why or why not? ________________________________________________________
_______________________________________________________________________________________________________________________
c. density - characteristic property? Yes or no (circle one). Why or why not? ________________________________________________________
_______________________________________________________________________________________________________________________
2. Compare the volumes determined by using the ruler and using water displacement. Why might there be some differences? __________________
_______________________________________________________________________________________________________________________
3. If the two objects had the same length, width, height, and shape, why were they not the same density? ___________________________________
_______________________________________________________________________________________________________________________
Part B. Irregularly shaped objects.
*Note – Read all steps before starting any work.
1. Measure the mass (in grams) of the wooden stick and record the data in the appropriate area of the data table.
2. Carefully place 50 ml of water in the 100 ml graduated cylinder. Note that 50 ml is recorded on the data table as “initial volume”.
3. Place the stick in the graduated cylinder – if it floats – use the wooden rod to submerge the object. Read and record the ‘final volume”.
4. Remove the stick and pat it dry.
5. Determine density (D = m/v)
6. Break the stick in half (close is fine!).
7. Repeat all the above steps for each piece and record all data in the appropriate spot on the data table.
8. Do the same procedures for the piece of modeling clay. And record all data.
B. Data Table
Object |
Mass (g) |
Volume (water displacement) (ml) Final vol (ml) Initial vol (ml) Object’s volume (ml) |
Density (D = m/v) |
Wooden stick - whole |
|
50 ml |
|
Wooden stick – piece #1 |
|
50 ml |
|
Wooden stick – piece #2 |
|
50 ml |
|
Modeling clay - whole |
|
50 ml |
|
Modeling clay – piece #1 |
|
50 ml |
|
Modeling clay – piece #2 |
|
50 ml |
|
Questions:
1. Why can you not use the ruler to determine the volume of the modeling clay? _______________________________________________________
_______________________________________________________________________________________________________________________
2. Why did you dry the objects before each step? _______________________________________________________________________________
_______________________________________________________________________________________________________________________
3. Compare the mass of the whole wooden stick to the sum of the two pieces? ________________________________________________________
_______________________________________________________________________________________________________________________
4. Compare the mass of the whole modeling clay to the sum of the two pieces? ________________________________________________________
_______________________________________________________________________________________________________________________
5. Why could the masses of the sums of the two pieces be different than the mass of the whole piece? _____________________________________
_______________________________________________________________________________________________________________________
6. How does the density of the whole piece of wood compare to the density of the two pieces? ___________________________________________
_______________________________________________________________________________________________________________________
7. How does the density of the whole piece of modeling clay compare to the density of the two pieces? ____________________________________
_______________________________________________________________________________________________________________________
Part C. Extension activities
*Note – Read all steps before starting any work.
1. Measure the mass of the smallest fishing sinker using the balance. Record the data in the appropriate place on the following data table.
2. Repeat step 1 for the medium fishing sinker. Record the data.
3. Repeat step 2 for the large fishing sinker. Record the data.
4. Carefully place 50 ml of water in the 100 ml graduated cylinder. Note that 50 ml is recorded on the data table as “initial volume”.
5. Place the small fishing sinker in the graduated cylinder – if it floats – use the wooden rod to submerge the object. Read and record the “final volume”.
6. Remove the sinker and pat it dry.
7. Determine density (D = m/v)
8. Repeat steps 4 thru 7 for the medium and then the large fishing sink.
9. Measure the mass of the wood block labeled “A”. Record the data in the appropriate place on the data table.
10. Measure the mass of the wood block labeled “B”. Record the data.
11. Determine the volume of the wood block labeled “A” by carefully measuring the length, width and height of the block and recording the data.
12. Determine density (D = m/v)
13. Repeat steps 11 and 12 for the wood block labeled “B”. Record all data.
{Special note – volume of the wooden blocks can also be determined by the water displacement method, please check with your instructor if that will be required).
C1 - Data Table
Object |
Mass (g) |
Volume (water displacement) (ml) Final vol (ml) Initial vol (ml) Object’s volume (ml) |
Density (D = m/v) |
Small sinker |
|
50 ml |
|
Medium sinker |
|
50 ml |
|
Large sinker |
|
50 ml |
|
Questions:
1. Compare the masses of the three (3) sinkers. _________________________________________________________________________________
_______________________________________________________________________________________________________________________
2. Why did you have to use the water displacement method to determine the volume of the sinkers? ___________________________________
_______________________________________________________________________________________________________________________
3. Compare the volumes of the three (3) sinkers. ________________________________________________________________________________
_______________________________________________________________________________________________________________________
4. Compare the densities of the three (3) sinkers. ________________________________________________________________________________
_______________________________________________________________________________________________________________________
5. What does this information tell you about the three sinkers? Why? ______________________________________________________________
_______________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________
C2 – Data Table:
Object |
Mass (g) |
Volume (measured = l x w x h) (cm3) l (cm) w (cm) h (cm) volume (cm3) |
Density (D = m/v) [using measured volume} |
Volume (water displacement) (ml) Final vol (ml) Initial vol (ml) Object’s volume (ml) |
Density (D = m/v) {using water displacement volume} |
Wood block “A” |
|
|
|
50 ml |
|
Wood block “B” |
|
|
|
50 ml |
|
Questions:
6. Compare the masses of the two blocks of wood _______________________________________________________________________________
_______________________________________________________________________________________________________________________
7. Why were you able to use direct measurement to determine the volume of the wood block? ____________________________________________
_______________________________________________________________________________________________________________________
8. Compare the volumes of the two wood blocks. ________________________________________________________________________________
_______________________________________________________________________________________________________________________
9. Compare the densities of the two wood blocks. _______________________________________________________________________________
_______________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________
10, Using this information, what can you say about the two blocks of wood? Why? ____________________________________________________
_______________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________
Measure volume of water in a graduated cylinder at the bottom of the ‘meniscus’ which is the bottom of the arc the water makes in the tube. So the measurement of the volume of water in the above example is 36 ml.
Supply list:
Aluminum cubes (must be the same size as the steel cubes and be able to fit in a 100 ml graduated cylinder)
Steel cubes
Wooden stick
Modeling clay
Small, medium and large steel fishing lures (with equal length strings attached)
Wooden blocks – same size, must be able to fit into 100 ml graduated cylinder – one is to be a hard wood and one a soft wood
100 ml graduated cylinders
Wooden rods (to push materials under water)
Squirt bottles (to carefully fill graduated cylinders to 50ml)
Eyedroppers (to remove water from graduated cylinders to bring water back to 50ml)
Beakers (water for each table)
Rulers
Paper towels
Content Provider
Mark Temons SAS
mass, volume, density, water-displacement, data, measurements, itsi, itsisu, concord