Friday, November 8, 2013

Pennies Lab

Density of Pennies Lab Introduction The one cent coin, unremarkably known as the cent, was the first currency of any sheath authorized by the United States. (www.pennies.org, pg.1)The first penny was make in 1787, peaceful of complete(a) shit. They continued to produce pure copper pennies until 1837 when they switched to bronze. In 1857 they began utilize copper and nickel. The composition of a penny changed twice more before 1982. The pre-1983 penny was do of an debasement of copper and zinc. An alloy is a substance that has alloy characteristics and consists of two or more different elements. (Coordinated Science, pg.1005) Our objective is to delicious the metal utilise inside a part-1983 penny. The accepted time prise of the constriction of a post-1983 penny is 7.05g/cm3. Density is the megabucks per unit volume of a material. (Coordinated Science, pg. 354) By reckon the closeness of post 1983 pennies, we depose compare it to the given tightness set of oth er metals to dislodge the metal used in the lens nucleus of a penny. Conclusion The metal used inside post 1983 pennies is zinc. We came to this conclusion by calculating the density of post 1983 pennies using the equation; massvolume=density. WE conducted three trials of this taste and found the intermediate density of a penny to be 6.92 g/cm3.
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The accepted value of a post 1983 penny is 7.05g/cm3. Our percent shift was 1.8%. In battle array to have logical results, your percent error must be equal to or below 3% and ours was below. Once we found our results to be valid, we compared our average density to the density of the given metals. The densit! y of zinc, 7.00 g/cm3, was the walking(prenominal) density in lean of our calculated density. Our effect had to be adjusted three measure in order to find accurate data. Our original procedure didnt measure mass or volume correctly. after(prenominal) adding in the correct steps, we conducted the audition successfully. Once our procedure was finalized, we were adequate to educate the results we needed. I wouldnt change the procedure....If you want to get a full essay, order it on our website: OrderCustomPaper.com

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