Water DisplacementHow to find unknown volumes and densities

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

How do they relate?

PracticeMass = 20 poundsVolume = 10 LitersWhat is the Density of this object?

ArchimedesAncient Greek mathematician, engineer, inventor, and astronomer

Born in Syracuse, Italy – lived to be 75

King Hieron II approached Archimedes 2200 years ago

Practice problems – find volume

What is the density of 14 mL of liquid substance with a mass of 2.6 grams?

find Density

Finding Density Lab

Each lab group has been assigned an unknown solid

The purpose of this lab is to identify your unknown

Things you will need:Unknown objectGraduated CylinderWater in Graduated CylinderTriple Beam BalanceCalculatorLab Report Sheet

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

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

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?

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?