When was copper added to u s coins?
The only true pure copper U.S. coins were the 1/2 and large cents. The Early U.S. silver and gold coins contained a little more copper in them up to the time the Liberty Seated coinage started. From about 1839 to 1964 the coin were .900 silver to .100 copper. It is about the same with the gold coinage. As someone already wrote silver and gold by themselves are to soft. They now make silver and gold coins that are .999 fine but they are not for circulation but as collectibles or an investment. They would never last if they were used in commerce. So the answer to your question is from 1794 to 1964 unless you count the 1792 1/2 dimes made from George Washington's silver, but not made in the first mint but down the street, you see the mint was not built to 1793. Actually coins up to 2007 have copper in them.
Silver will get wet. A different thing is adding copper to silver nitrate solution. Solution turns bluish (Cu ++ ions formed) and metallic Cu disappears while silver metal precipitates. Simple redox reaction: copper is more reactive than silver and forces poor little Ag+ to accept electrons and get reduced
Why are pennies copper and all the other coins silver?
actually pennies are only copper coated, they have zinc on the inside. And other coins are made of varios metals. Nickels are/ were made of mickle. Quarters used to be silver, but are now copper in the middle and some other metal on the outside. back when the US was on the gold standard, a penny was exactly the amount of copper that was worth one cent. This means they changed the amount every year. now they all weight the same. Oh, and coins are different sizes and shape so you can quickly tell the difference between them.
Why is the penny copper, and all other coins silver?
When coins used to be worth their relative metal value ("real money"), a 90% silver penny denomination would have been too small (fall through hole in pocket), thus 95% copper was used up to 1982. Since 1982, the penny is 95% zinc. In terms of metal value, when factoring labor to do sorting, the USA nickel coin is currently the only coin in circulation that is worth more than it's legal tender fiat face value: http://answers.yahoo.com/question/index;_ylt=AuVVEsyG4KlKFbahTs9OKYzsy6IX?qid=20060726091228AAheR3M Since nickels were real money since civil war, it is likely they will be used as real money again, and thus hoarding them now could be very profitable. See the above link for more information.
What Year did Coins Stop being Pure Silver, Copper, Gold?
United States Coins History Half-dollars virtually disappeared from circulation following the introduction, in 1964, of the Kennedy half-dollar. Despite the fact that huge quantities were produced, the half-dollar remained scarce in general circulation through 1970. Silverless halves first appeared in 1971. 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. Silver was eliminated from the dime and the quarter. The half-dollar's silver content was reduced to 40 percent and, after 1970, was eliminated altogether. In 1981 Congress authorized a change in the penny's composition, abandoning the 95 percent copper and 5 percent zinc alloy used for decades. The one-cent piece is now copper-plated zinc—97.5 percent zinc and 2.5 percent copper. The old and new pennies look virtually identical, but the new coin is about 19 percent lighter.
The key thing to note with this reaction is that copper is further up the reactivity index than silver. So it will displace the silver cations (reducing them to the elemental metal), whilst itself being oxidised to Copper II cations (Cu2+) and going into solution. So you end up with the silver metal precipitating out and a copper II nitrate solution remainingCu (s) + 2AgNO3 (aq) → Cu(NO3)2 (aq) + 2Ag (s)
When a strip of copper metal( in the form of a wire) is released in the solution of silver nitrate, copper being a more reactive metal than silver displaces silver from its compound by forming copper nitrate with a shiny greyish white deposit of silver on the copper strip.2AgNO3 + Cu ——-> Cu (NO3)2 + AgWhereinAg- SilverAgNO3 - Silver NitrateCu - CopperCu(N03) - Copper Nitrate
Silver coins quarters?
The easiest way to calculate the value of silver coins is .73 * silver price*denomination. American silver coins, (other than $1), have about .73 ounces of silver per $1 face value. If silver is $12/ounce, then a quarter is worth .73*12*.25=$2.19 in silver. This is the theoretical price, and a dealer will pay you less, (ten percent is fair). For a silver dollar, the percent silver is 78%. By the way, your quarter does have copper too. All US "silver" coins are also 10% copper in the alloy. Now, a collectible coin is worth even more. For Washington quarters, the only real dates to look for are 1932 S or D, and 1936 D. Most other dates, if they are worn, are worth melt. If it is uncirculated, (brand new), it is worth more, ranging from just a little if the date is in the 1960's, to a LOT if it is a date in the 1930's. If it looks brand new, make sure you take it to a dealer and get his opinion.
Why is the penny the only copper coin?
Well, if you wanted to hear a monetary history of the United States, the penny isn't the only copper coin. They used to have a 2c coin made of copper and a half penny coin made of copper. They got rid of those in the 1800s though. Also, nickels, dimes, and quarters are not made of the element silver, but rather are a combination of copper and nickel. That's why when you look on the outer rim of a quarter or dime, there is a band of brownish metal in between two bands of silver-colored metal. The other coins are silver colored because, back when those coins were worth a useful amount of money, they made them out of silver. When they got rid of the silver in 1964 because the coins simply weren't worth it anymore, they chose nickel because it also is silver in color. Also, speaking of there being an absence of copper coins, in Australia they have no copper coins. Their smallest coin is the silver-colored 5 cents. They also have silver-colored 10c, 20c, and 50c, and gold-colored $1 and $2.