Chem Lab 1

Chem Lab 1 - Mike Geddes CHEM 131L 112 Lab #1: Discussion...

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Mike Geddes CHEM 131L – 112 Lab #1: Discussion The data collected from massing pennies shows a line of points around 3.1 grams before 1982 and around 2.5 grams afterwards. Some points graphed, however, are considerably far off where one would expect them to be. For example, five points are each located approximately 3.5 grams higher than there should be, which can be attributed to not zeroing the balance with the massing dish. Also, there are several points which do not line up with the correct mass which should correspond with their manufacturing year, which probably resulted from poor penmanship or mistakes with copying data onto the computer. It was thought that older pennies would be lighter due to gradual decomposition over time rather than be heavy because of build up with oils and substances from the environment. Copper and zinc can be oxidized, thus losing the ability to bond strongly to other atoms within the penny because of having fewer electrons to bond with. Outliers are pieces of statistical data which exist, but are way off of any established trend
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This note was uploaded on 04/09/2008 for the course CHEM 132L taught by Professor Pavel during the Fall '07 term at Marist.

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Chem Lab 1 - Mike Geddes CHEM 131L 112 Lab #1: Discussion...

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