2 Objectives Calculate density of BB’s Measure volume using the water displacement methodDetermine if a BB is solid copper by comparing its density to the known density of copperConstruct graphs, determine equations for straight lines on the graphs, and gain an understanding of what these lines can be used for on a graph
3 MaterialsElectronic Balance, Graduated cylinder, BB’s, and Weigh boat
4 BackgroundUsing density to determine the identity of an unknown material has been done for many years. Because density is an intensive property, it does not change no matter how large the sample you have. In this lab students will attempt to determine if a BB is solid copper or not. They will do this by comparing the density that they find for their BB’s and the actual density of copper.
5 ProcedurePlace a weigh boat on the electronic balance and rezero the balance.Place 5 BB’s in the weight boat and record their massPlace approximately 5 ml of water in the 10 ml graduated cylinder and record its exact volumePlace the 5 BB’s in the graduated cylinder and find the volume of just the BB’s (volume with BB’s – volume with no BB’s) and recordContinue this process with 5 more BB’s until you have found the mass and volume of all 60 BB’s
6 Procedure PhotosThe weigh boat has a mass, however, we only want to record the massthe BB’s. A simple way to do this is by zeroing the balance by pushingthe zero button. Once that is done, the balance will read zero, eventhough the weigh boat is on the balance. Adding 5 BB’s to the weighboat measures just the mass of the 5 BB’s. Notice the weigh boathad a mass of 2.27 g and the 5 BB’s have a mass of just 1.70 g.Make sure you continue to add the masses of 5 BB’s together to getThe mass of 10, 15, 20, etc
7 Procedure photosThe volume of the graduated cylinder with no BB’s is about 5.1 ml. WithBB’s, the water is displaced to a volume of 7.8 ml. Therefore the volumeof this number of BB’s is 7.8 – 5.1 OR 2.7 ml
8 Data Collection & Analysis Measure the mass of each set of 5 BB’s until you have the mass of 60 total BB’sMeasure the volume of each set of 5 BB’s until you have the volume of 60 total BB’sCalculate the density of each set of 5 BB’sConstruct two graphs and determine the equation of each line (straight lines)Mass (y-axis) versus # of BB’s (x-axis)Mass (y-axis) versus volume (x-axis)
9 GradingGraphs are done correctly (labels, units, title, equation of line, etc.)10 questions from back of data sheet
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