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Unformatted text preview: pennies was changed because copper was worth more than a penny. The mint decided to make the pennies with more zinc and a thin layer of copper in them. In this experiment, we found out that the density of old pennies is lower than the density of newer ones. We used the equation: Density=mass/volume to find the density of old and new pennies, zinc and copper. We also used a formula to calculate the percent error in the end. The equation for % error is [(Correct value experimental value)] / Correct value * 100%. We used this equation to calculate the percent error in the densities of old and new pennies and the densities of zinc and copper. We also found the standard deviation of our individual penny volumes and that of the class. We also graphed the mass of pennies vs. the year they were made, mass vs. volume of copper, mass vs. volume of zinc, mass vs. volume of old pennies, and mass vs. volume of new pennies....
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This note was uploaded on 11/06/2010 for the course SCIENCE 0202 taught by Professor Marlyn during the Spring '10 term at Temple.
 Spring '10
 Marlyn
 Science, Mass

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