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Determination of % copper and Zinc in pennies

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Determination of % copper and Zinc in pennies
Determining the Percent Copper and Zinc in Pennies from Density Lab Report
Procedure:
For pre-1982 pennies-
Mass 10 pennies, record data. Fill a 100mL graduated cylinder to 40mL or enough to fully submerge the pennies with water, record the volume in data table. Carefully place the pennies into the graduated cylinder, record the final volume of the water in data table. To find the volume of the pennies, subtract the final volume from the initial, record the data. Repeat this procedure twice more. Use the density formula to calculate the density, and then calculate the accuracy and precision of your measurements.
Mass 20 pennies, record data. Fill a 100mL graduated cylinder to 40mL or enough to fully submerge the pennies with water record the volume in data table. Carefully place the pennies into the graduated cylinder, record the final volume of the water in data table. To find the volume of the pennies, subtract the final volume from the initial, record the data. Repeat this procedure twice more. Use the density formula to calculate the density, and then calculate the accuracy and precision of your measurements.
Mass 30 pennies, record data. Fill a 100mL graduated cylinder to 40mL or enough to fully submerge the pennies with water record the volume in data table. Carefully place the pennies into the graduated cylinder, record the final volume of the water in data table. To find the volume of the pennies, subtract the final volume from the initial, record the data. Repeat this procedure twice more. Use the density formula to calculate the density, and then calculate the accuracy and precision of your measurements.
For post-1982 pennies-
Mass 10 pennies, record data. Fill a 100mL graduated cylinder to 40mL or enough to fully submerge the pennies with water, record the volume in data table. Carefully place the pennies into the graduated cylinder, record the final volume of the water in data table. To find the volume of the pennies, subtract the final volume
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