Measuring the Density of an Unknown Metal

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September 19, 2007 Section 4 Measuring the Density of an Unknown Metal Purpose: The purpose of this experiment is to measure the density of an unknown metal by the method of water displacement, and computing the average density using both an arithmetic and graphical method. Chemical Equations: There are no chemical equations in this lab, because the lab is meant to measure physical property, not a chemical one. Data Tables: See notebook page. Calculations: Absolute Uncertainty using Worst-Case Computations Total Mass: 222.9722g (+/- 0.00169) Total Volume: 25.7mL (+/- 4.0)
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Density Upper Limit: 10.28g/mL Density Lower Limit: 7.51g/mL Density Range: 1.385 Absolute Uncertainty: +/- 1.385 Density: (+/- 1.385) 8.68g/mL Class Average Density: 8.39g SD (+/-) .57 8.96g - 7.80g/mL * +/- on SD means 68% of the values fall within that range Error Analysis: The most possible way to reduce error in this lab would be to not allow the air bubbles to
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Unformatted text preview: form when transferring the water into the tube with the metal. Another possible way would to be to make sure the metal has no connection with any other surface that could add a residue to it, which would change the weight. Results: The average density value for this class was 8.39g/mL. The absolute uncertainty for this was +/- .57. The density value determined was 7.837 and the R-squared value was 0.946. The class Avg. density value was .95, which means that most of the class fell within two standard deviations. Through investigation, it is believed that the metal tested was nickel, because the density of nickel is 8.9g/mL and the avg. found for the unknown metal was 8.7g/mL. The other possible metal it could have been was copper, but the unknown was a silver color, and not so much a bronze. References/ Sources: Lab manual pg. 37-39 CRC book for the different metals...
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