As we have seen in class today the density of a material tells us how much mass is contained in a certain volume of the material. The density of a material is a particular property of that material. Given an unknown substance a measurement of the density can shed light on what the material is composed of. The density of a material is defined by the equation:

Density = (mass)/(volume).

So in order to measure the density of an object you need to determine the mass and the volume of the object and that is the project for today.

You will be given three unknown objects (you will guess what they are made of by looking at them) and you will measure the density of each object. Then given a table of known densities you will see if your guess's are true.

Part 1: Guess what the three objects are made of and label them as such. Measure the mass of each object in the units of grams (g).

Part 2: Determine the volume of each object. Perform the necessary measurements using cemtimeters (cm) to obtain the volume for each object and then determine the volume for each object in the units of cm^3 (centimeters cubed).

Part 3: Using the above equation for density calculate the density for each object.

Part 4: Using the table below try to determine what material each of your objects are made of. From your measurement of densities and your selection from the table does your determination of the material in the object match what you thought the object was made of?

Material and the number next to it is the density in units of g/cm^3.

Platinum 21.5

Gold 19.3

Uranium 19.0

Lead 11.3

Silver 10.5

Copper 8.9

Brass 8.6

Iron 7.8

Tin 7.3

Chromium 6.9

Aluminum 2.7