November 30, 2015

Homework Help: Science

Posted by Beth on Saturday, September 8, 2007 at 9:12pm.

My physical science class is doing an experiment on the mass of pennies. I hypothesized that newer pennies would have less mass because cheaper materials are being used. I found that before 1982, pennies were made from 95% copper/5% zinc, and after 1982 from 99.2% zinc/0.8% copper. The mass of pre-1982 pennies is around 3.3 gr, and after 1982 about 2.5 gr. This would seem to support the hypothesis that zinc has less mass than copper, but I can't find any information about mass on the different metals. All I can find is atomic weight, and I don't even know if this relates to mass. Would someone be able to give me information about the mass of metals or know of a website that would have this information?

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