I. Purpose and Procedure In this experiment, groups were each given two unknown metals in which they had to find the mass, volume, and density. After finding the density of the unknown metals by dividing the mass by the volume, the groups had to exchange data and find the average densities of the two unknown metals. A table of accepted value of metals and their densities was given out to each group so they could match the average densities to the accepted values and identify what they unknown metals were.

The objective of this lab was to determine the identity of unknown metals by calculating their densities, and to determine a graphical relationship between the mass and volume of a given substance. Each group was given two unknown metals, a 100 ml graduated cylinder, a balance, and a weighing boat. To find the mass, the experimenters had to weigh the empty weighing boat. After, they had to weigh the unknown metal in the boat. Then, they had to subtract the mass of the weighing boat from the mass of unknown metal to figure out Just the mass of the metal.

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Lead is known to be denser than other metals, and it is a dark gray metal. The data of Unknown Metal 1 matches the qualities of lead. For Unknown Metal 2, the experimenters believe that the metal is aluminum. The average density of Unknown Metal 2 from the seven groups was 2. 4 g/CM. The accepted value density of aluminum is 2. 7 g/CM. There is only around an 11 percent error. Aluminum is known to be a very light metal and the masses of Unknown Metal 2 were very light. Also, each group described Unknown Metal 2 as a light gray. That is values and the accepted values, the more accurate the groups were.

Both percent errors were under 15 percent which implies that the groups were fairly accurate while conducting this experiment. There were a few sources of error during this experiment. The first error was the balance. The balances were extremely sensitive and could not register a final mass because they kept changing masses. Another source of error had to do with weighing the metals. A weighing boat was used to keep the metal from spilling while someone weighed it. Some groups may have forgotten to subtract the weighing boat mass from the mass of the metal in the weighing boat. Other than that, the experiment went well.

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