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Water DisplacementHow to find unknown volumes and densities
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Define: Mass, Volume, DensityMass
The amount of matter something has What is matter?
Measured in poundsVolume
The amount of space something takes upDensity
Amount of matter PER space
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How do they relate?
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PracticeMass = 20 poundsVolume = 10 LitersWhat is the Density of this object?
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ArchimedesAncient Greek mathematician, engineer, inventor, and astronomer
Born in Syracuse, Italy – lived to be 75
King Hieron II approached Archimedes 2200 years ago
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Practice problems – find volume
What is the density of 14 mL of liquid substance with a mass of 2.6 grams?
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find Density
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Finding Density Lab
Each lab group has been assigned an unknown solid
The purpose of this lab is to identify your unknown
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Things you will need:Unknown objectGraduated CylinderWater in Graduated CylinderTriple Beam BalanceCalculatorLab Report Sheet
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Lab ReportFill in your materials list, your purpose, and
your hypothesisAs we complete each step in this lab, fill each
one in the procedure section in great detailAs we complete each step fill in the
data/observations/results section
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ProcedureWeigh your unknown object AND RECORD
THE WEIGHTRecord the volume of the water in the
graduated cylinderSubmerse the unknown object into the
graduated cylinder and record the new volume of the water
Find the volume of your object AND RECORD IT
Using the volume and the mass, find the density (remember the formula we use for this)
Compare the density your group found with the densities posted on the board in order to identify your unknown substance
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ObservationsHow did you find the volume of your
object?How did you find the density of your
object?What unknown substance did your
group have?Did any other groups have that
substance?Did the volume of the substance
change the density of it?
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Conclusions
What did we learn from this lab?Can we now successfully identify an
unknown metal or element?Where could we find this list of
densities to identify metals with if they were not given to us?