The density of a pure substance does not depend upon the amount of that substance. Like temperature or melting point, density is an intensive property. That is, a ton of lead has the same density as a milligram of lead (11.63g/cm3). Common units for density are grams per cubic centimeter for solids, grams per milliliter for liquids, and grams per liter for gases. In this lab we will work with solids.
To develop the formula for density from experimental data by graphical interpretation, and to make comparisons in the densities of two different metals.
various sized graduated cylinder (10-100 ml)
6-8 metallic objects
1) Pick up a container holding 8-10 metallic objects. These objects are not marked. It will be the duty of one person to be sure to keep track of which objects have massed and keep the process orderly.
2) First determine the masses of each object by laying it on the balance pan and determining its mass. Be sure that the metallic object is dry.
3) After each object's mass has been determined, carefully lower the metallic object in to a graduated cylinder (choose a cylinder slightly larger than the piece, a 25 mL may work for all pieces) containing an accurately measured amount of water. I suggest you have 5.0 ml of water already in the graduated cylinder. Be sure that the metallic object is completely submerged in the water before taking a new reading off the graduated cylinder. This method of determining the volume of an irregularly shaped object is called volume displacement.
At the end of the writing is an example data table for you to use in recording your experimental data.
Make a graph of mass versus volume. Record the mass along the vertical axis and the volume in ml along the horizontal axis. Plot all data points on the graph. Give the graph a title; follow accepted graphing procedures.