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Why is the outside surface of a penny made of copper and not zinc?
Traditionally, the US penny (or, more properly, the US one cent coin) has been made of copper or copper with a small amount of zinc (except in 1943, when it was made of steel with a zinc coating). During 1982, as the price of copper meant that the "melt value" of the coin was more than one cent (that is, it had more than one cent's worth of copper), the decision was taken to produce the penny out of a cheaper metal - zinc. A coating of pure copper (equal to 2.5% of the total composition of the penny) was added so as not to change the appearance of the penny.
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It turns out that the solid copper U.S. cent was minted from 1793 to 1837. After that, it was "mostly" copper, and the other metals included in the alloy varied a bit from tim…e to time. It was in 1982 that the big change occurred and the copper content of the cent was cut to the 2.5% copper used in the plating. Hey, why not surf on over to the Wikipedia post on the U.S. cent and look at the handy table showing what was in the penny at different times in history? Oh, and you'll need a link. We've got one for you, and you'll find it below.
The price of copper rose to the point where it cost more than 1 cent to make the coins. There's more information at the Related Question.
pennies are made of mostly zinc but have some copper in them MoreThe composition of US cents was changed from bronze in mid-1982. The coins now have a zinc core plated… with copper (rather than mixed together). Zinc makes up 97.5% of the coin by weight.
i am not sure but i think you weigh it then subtract weight of copper sorry if you don't understand
Gently sand about 1/3 of the edge of the penny just enough to remove the copper and expose the zinc. Then soak the coin in 5% Muriatic acid in a glass dish until it stop…s bubbling. The Muriatic acid will dissolve the zinc and leave the copper shell intact. Wear rubber gloves and use tweezers to gently remove the copper shell. Thoroughly rinse the copper shell and handle it very carefully as it is very thin.
Cents minted since mid-1982 are 97.5% zinc and 2.5% copper.
The composition was changed in the middle of the year so some 1982 cents were made of bronze while others are copper-plated zinc. The best way to tell them apart is by weigh…ing them. Bronze cents weigh about 3.11 gm, zinc ones weigh 2.5 gm.
Lincoln cents from 1982 to date are 99.2% Zinc & 0.8% copper.
Yes, Brass is an alloy made of copper (Cu) and zinc (Zn).
Yes, as long as there is no chemical interaction between them.
The cent's composition was changed in mid-1982 due to rising copper prices. Cents dated 1982 were struck in both bronze and copper-plated zinc. The easiest way to tell them …apart is to weigh one. A bronze cent will weigh about 3.11 gm while a zinc one weighs 2.5 gm.
Is the ratio of copper to zinc in the pennies made after 1982 higher or lower than the ratio of copper to zinc in the pennies made before 1982?
The pre-1982 pennies are 95% copper and 5% zinc. Post-1982 cents are 97.5% zinc and 2.5% copper.
You can tell if a penny is made out of zinc or copper by the date on the penny. If the date is before 1982 then the penny is 95% copper. Pennies dated 1983 or later are 97.5…% zinc with a thin copper coating.