From the 1870s to 1964, all US silver coins were made of an alloy of 90% silver and 10% copper regardless of denomination. There are 16x25 = 400 ounces in 25 lbs so 90% of that is 0.9 x 400 = 360 oz.
But be careful !! Silver is normally weighed and priced in troy ounces which are slightly heavier than standard US ounces. The approximate conversion factor is 1 US ounce = 0.91125 troy ounces, so the silver in the bag would weigh 360 x 0.91125 = 328.05 troy oz.
old ones that are pure silver, but most newer coins are mixed metal and have copper among other metals that concuct electricity mixed in!
Most coins intended for circulation are not pure silver. While recently there are coins such as the American Silver Eagle which are pure silver, silver has not been in any American circulating coin since 1970 when the 40% silver alloy was removed from the half dollar, pre-1964 Quarters, Dimes and Half-Dollars contain 90% silver with 10% copper. Silver is a very soft metal and would not hold up to daily wear and tear of everyday transactions so it needs to be mixed with a harder metal for it to be resistant to wear and tear.
50 ounces is equivalent to 3 and 2/3 pounds as a mixed number.
If the gross weight of the chain is 3 ounces, you still need to determine the silver content of it -- it probably is not 100% silver -- it's probably mixed with some amount of copper for strength. Once you have determined the exact silver content in Troy ounces, then you can multiply it by the current silver spot price -- which is about $17.00 as of 12/22/09 Se the related links for a link to the Kitco website, where you can monitor daily silver spot prices.
There's no such thing as a gold silver dollar. Dollar coins were made of gold (1854-1889) or silver (1794-1935) but the 2 metals were never mixed. Most likely you have a silver dollar coin that was plated. Unfortunately being plated reduces its value to that of the raw metal in it, about $10 as of 06/2009.
yes, dental silver is mixed with something to make it harder.
The most common metal mixed with silver to form sterling is copper.Silver Jimwww.SilverChatter.com
ROME
Some percentage of alloyed is mixed with silver to make sterling silver jewelry. What is the name of this alloyed ?
platinum
it is called Electrum!
silver nitrate and potassium iodide can be used.