“Finding Volume by H2O Displacement”. It is on the table by the door. Today’s Learning Targets: I can create a graph to show physical relationship. I can collect scientific data. Turn in your syllabus to the shelf if you didn’t turn it last class. Pick up the page titled “Finding Volume by H2O Displacement”. It is on the table by the door.

Finding 1 BB’s Volume by H2O Displacement

Graduated Cylinder – Used for measuring liquid volume.

Final volume – Initial Volume Volume by liquid displacement Volume of the balls: Final volume – Initial Volume 6mL – 4 mL = 2 mL Final Volume Ending Volume 6 milliliters Or 6 mL Volume of 1 ball: Volume / # of balls 2 mL / 2 balls = 1 mL / ball Initial Volume Starting Volume 4 milliliters Or 4 mL

Why is H2O displacement a good way to find volume of 1 BB? Discuss with a shoulder partner Why is H2O displacement a good way to find volume of 1 BB? Record your answer on the handout provided.

increase proportionally Objects displace their volume when submerged Finding Volume by H2O Displacement First Last Name: ____________________ Introduction: (answer this question: Why is water displacement a good way to find the volume of one BB?) Since it is difficult to reliability measure the radius of a BB, volume cannot be calculated with the formula for the volume of a Sphere. By sinking many BB’s into water, the total increase in the water level can be divided by the number of BB’s submerged to find the volume of just one BB. increase proportionally Hypothesis: If the number of _______________________________ is _____________, then _______________will ________________ because ____________________________________________________________________________. Submerged BB’s increased Volume Objects displace their volume when submerged Material list: Water, colored 2 _____________ ________________ Collection Tray At least 60 BB’s Towel Pipette Netting or cloth Procedure: Pour ________ of water into graduated cylinder (GC). Use the pipette for accuracy. Record water level on the data table. Count out 10 BB’s. Add 10 BB’s to the GC. Record the total number of BB’s submerged. Record the new water level. Repeat steps 2 through 4 until 60 BB’s are submerged. Secure the netting over the GC. Pour the water from the GC into the beaker. Pour the BB’s from the GC onto the towel. Pay dry. Return to the beaker designated for the BB’s. Place all lab materials in the collection tray. Return tray to main table. BEAKERS Graduated cylinder

Finding Volume by H2O Displacement Name: ____________________ Introduction: (answer this question: Why is water displacement a good way to find the volume of one BB?) Hypothesis: If the number of _______________________________ is _____________, then _______________will ________________ because ____________________________________________________________________________. Material list: Water, colored 2 _____________ ________________ Collection Tray At least 60 BB’s Towel Pipette Netting or cloth Procedure: Pour ________ of water into graduated cylinder (GC). Use the pipette for accuracy. Record water level on the data table. Count out 10 BB’s. Add 10 BB’s to the GC. Record the total number of BB’s submerged. Record the new water level. Repeat steps 2 through 4 until 60 BB’s are submerged. Secure the netting over the GC. Pour the water from the GC into the beaker. Pour the BB’s from the GC onto the towel. Pay dry. Return to the beaker designated for the BB’s. Place all lab materials in the collection tray. Return tray to main table.

Finding Volume by H2O Displacement Name: ____________________ Finding Volume by H2O Displacement Data Collection Initial H2O level: ____________ Number of BB’s* H2O level Unit: ______ Volume of BB’s** NOTE: For this first lab, we are not conducting multiple trials b/c we don’t have time. For most labs (and for valid lab data), a minimum of THREE trials is required. * This should be the total number of BB’s that are submerged. * To find the volume of the marbles that are submerged, subtract: __________ - __________ You need to fill all lines of the data table so that you will have 5 data points to include on your graph on the back. Complete the graph and the analysis questions on the back.

( ) Add a descriptive graph title here 1. Find the volume of one BB. Find the volume of 6000 BB’s. You are in charge of packaging for a BB company. To design a package that will hold 6000 BB’s, describe how you would determine the volume of the container. (Hint: it is not the same number you found for number 2 above). Displaced volume vs. Number of BB’s # of BB’s Volume ( ) 10 ( ) 6 12 18 24 30 36 42 48 54 60