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1864 to 1942 3.11 g 19 mm 95.0% Copper and 5.0% Zinc & Tin (bronze mix) ... 1943 2.70 g 19 mm Steel with Zinc coating ... 1963-1982 3.11 g 19 mm 95.0% Cu and 5.0% Zinc...
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lrs.ed.uiuc.edu/students/tsullivl/commoncents/PennyComp...
lrs.ed.uiuc.edu/students/tsullivl/commoncents/PennyComposition.htm
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The composition of the penny was pure copper from 1793 to 1837. Then following that, it was made of bronze, and in 1857, it was made out of copper. In 1943, the content of the coin was changed to zinc coated steel because of the copper shortage during World War 11. Before 1982, pennies were 95% copper and 5% zinc.
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hypertextbook.com/facts/2002/MillicentOkereke.shtml
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composition of pennies, copper color, change jar: Hi Paul, You have a normal penny that has been baked. The composition of pennies was changed in 1982 to be almost completely zinc with a thin outer layer of copper. ... These pennies have no added collector value. I hope this helps, Dan;
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en.allexperts.com/q/Coin-Collecting-2297/1987-penny-cop...
en.allexperts.com/q/Coin-Collecting-2297/1987-penny-copper.htm
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name Adrienne M. status student age 16 Question - Has the composition of the penny changed over the years? What were the changes? What metals are in the penny now? -------------------- The penny has gone from copper to copper plated zinc.
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www.newton.dep.anl.gov/askasci/chem00/chem00373.htm
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The composition of pennies changed in late 1982, when zinc became the primary metal instead of copper. Before 1982, pennies were forged of 95 percent copper and 5 percent zinc. However, as copper became more expensive, it was abandoned as the primary metal.
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www.aafp.org/afp/20000215/tips/25.html
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Date: Thu Mar 23 12:04:31 2000; Posted By: Joseph Weeks, ... The change was made because zinc is cheaper than copper. When you place a copper-plated zinc disk in HCl, the copper dissolves in the acid to form copper chloride which should color the solution blue. ... If you are using a solution of all three chemicals,
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www.madsci.org/posts/archives/mar2000/953840222.Ch.r.ht...
www.madsci.org/posts/archives/mar2000/953840222.Ch.r.html
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Part 3: Do your results in Part 2 provide any information about the kind of metal found in pennies? What metals are present in pennies? Have all pennies been minted with the same composition? Do pennies wear out?
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wwwchem.csustan.edu/CHEM1102H/pennyhon.htm
wwwchem.csustan.edu/CHEM1102H/pennyhon.htm
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Purpose: There are three purposes to this experiment: 1) to perform a quantitative analysis of a penny, 2) to observe some chemical properties of copper and zinc and 3) to collect data on the masses of pennies minted in different years.
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wwwchem.csustan.edu/chem1102/pennies.htm
wwwchem.csustan.edu/chem1102/pennies.htm
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The composition of U.S. coins has changed considerably over the past few decades. Because of a growing worldwide silver shortage, the Coinage Act of 1965 authorized a change in the composition of dimes, quarters, and half-dollars, which had been 90 percent silver. ... The old and new pennies look virtually identical,
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www.coinresource.com/articles/FRB_united_states_coins.h...
www.coinresource.com/articles/FRB_united_states_coins.htm
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