Physical Science
Unit 2: Introduction to Physical Science
Which is denser: water or oil?
Monday:
Objectives: Determine that density is a function of mass and volume.
. Discussion: Why does hot air rise?
Activities: Density WS
Demo: Coke and Diet Coke
Dancing Raisins
HW: Get tests signed
Tuesday:
Objectives: Determine that density is a function of mass and volume.
Lab: Density block and plastic rock labs
Activity: Density Calculations from Lab
Wednesday:
Objectives: Determine that density is a function of mass and volume.
Lab: Little Debbie Density Lab
Activity: Density Calculations from Lab
Thursday:
Objectives: Determine that density is a function of mass and volume.
Activity: Finish all lab questions
HW: Finish lab questions
Study for test
Friday:
Objectives: Demonstrate an understanding of density through a lab practical.
HW: TBA
Physical Science
Unit 2: Classification of Matter
Density
Still dense about density?
Density is a physical property that can be used to identify matter. The density of a substance is its mass divided by its volume. This exercise will you understand density.
The table lists some substances and their densities. Look at the table carefully. Arrange the substances in order of their densities; begin with the least dense substance and end with the densest.
Densities of some common substancesLiquids (g/cm3) / Gases (g/cm3) / Solids (g/cm3)
Alcohol / 0.796 / Air / 0.0013 / Ash wood / 0.65
Water / 1.000 / CO2 / 0.0018 / Balsa wood / 0.37
CCl4 / 1.595 / Helium / 0.00018 / Glass / 2.60
Motor oil / 0.896 / Hydrogen / 0.00009 / Oak wood / 0.68
Sulfuric acid / 1.630 / Nitrogen / 0.0012 / Tin / 7.18
Liquids: 1. ______
2. ______
3. ______
4. ______
5. ______
Gases: 1. ______
2. ______
3. ______
4. ______
5. ______
Solids: 1. ______
2. ______
3. ______
4. ______
5. ______
These five balloons are filled with one of the gases listed above. In the space beside the balloons, write the name of the gas that you think each balloon contains.
1. ______
2. ______
3. ______
4. ______
5. ______
How do you measure the density of a wood block?
Objectives: to find the density of a block of wood.
Possible materials: balance metric ruler wood block
Procedure:
1. PUT ON GOGGLES
2. Using a ruler, measure the dimensions (length, width, and height) of the wood block. Record the dimensions in the data table.
3. Using a balance, measure the mass of the wood block.
Data Table:
Object / Length (cm) Width (cm) Height (cm) / Mass (g)Wood block
Conclusion:
1. What is the volume of the block of wood?
2. What is the density of the block of wood?
How do you measure the density of a plastic rock?
Objectives: to find the density of a block of wood, water, and a plastic object
Materials: balance beaker water
graduated cylinder plastic object
Procedure: *****Read the procedure very carefully. Follow the directions!*****
4. PUT ON GOGGLES
5. Obtain the plastic object. Use the balance to find the mass of the plastic object. Record this value in grams in the data table.
6. Add 50 mL of water into the graduated cylinder. This is the initial volume. Record the exact measurement in the data table.
7. Tilt the graduated cylinder and VERY SLOWLY drop the plastic object into the graduated cylinder.
8. Place the graduated cylinder on a flat surface and read the volume of the water. Record this new volume as the final volume in the data table.
9. Pour out the water and recover the plastic object.
10. Clean your lab area and return to your seat.
Data Table:
Object / Initial Volume / Final Volume / MassPlastic object
Conclusion:
3. What method of measuring volume is used to find the volume of a plastic object?
4. What is the volume of the plastic object?
5. What is the density of the plastic object?
Checking your understanding:
1. How would you calculate the density of a marble? a textbook?
Physical Science
Unit 2: Classification of Matter
Density
How do you calculate the density of a Little Debbie Brownie?
Purpose: to determine the density of a regular shaped object
to find the relationship between density and the amount of an object.
Materials: What materials will you need?
Procedure: 1. Put on goggles.
2. Place the Little Debbie Brownie on the electronic balance to measure the mass. Record the
mass in the data table.
3. Use a ruler to measure the length, width, and height of the Little Debbie Brownie. Record the
data in the data table.
4. Cut the brownie in half.
5. Repeat steps 2- 3 with both halves of the brownie.
Data Table:
ObjectWhole Brownie
Half of Brownie
Other Half of Brownie
Conclusion:
1. How do you calculate the volume of a regular shaped object?
2. Calculate the volume of the whole brownie.
3. Calculate the volume of half the brownie.
4. Calculate the volume of the other half of the brownie.
5. How do you calculate density?
6. Calculate the density of the whole brownie.
7. Calculate the density of half the brownie.
8. Calculate the density of the other half of the brownie.
9. What is the relationship between the two halves of the brownie? How does their density compare to each other?
10. What is the relationship between the whole brownie and the halves of the brownie? How does their density compare to each other.
11. Does the density of an object change? What type of property is it?
12. Why was the density of the brownies not the same?