Gold is considered one of the most viable types of metal for roads and clouds, where you can hit him or his ways, even up to a density of 0.000013 cm and gold is very inert metal which is not affected by air or heat or humidity. It does not dissolve in acid concentrated mineral known, such as hydrochloric acid, sulfuric, phosphoric and nitric, but dissolves in aqua regia, which is a combination of acid, hydrochloric and nitric centers where the liberated chlorine nascent Iveb gold and there are acids other influence in gold, such as acid Altmartik and chloride iron hot and other
Purification of gold
Purification of gold to separate dust and other impurities by water currents strong to remove the minutes of sandy and alluvial, and keep minutes of gold in place due to the high density of gold has been used mercury to dissolve gold without the sand and silt and then finds the gold from the mercury by distilling the latter also draws gold presentation at the mining of copper, silver, and there are methods of chemical to extract the gold, which is pulled by way of cyanide, or silver alloys dissolve in concentrated sulfuric acid, and purification are gold with nitric acid first, then the electrolysis
Uses of gold
The beauty of gold and luster, and its resistance to corrosion of metals has made him unique in the various arts and crafts since ancient times
Use gold as currency and the basis for international financial transactions and the unit used in the weight of gold is an ounce, equivalent to 31.1 grams is also used as a reserve currency was gold and silver are used used directly Currencies During the nineteenth century, played a gold a new role where he became the only basis for the currencies of most countries in the world where it can be converted securities to gold, since the seventies of the twentieth century, the gold is sold and bought in the market prices fluctuate greatly, and became the relationship between gold reserves and the value of currency is a direct relationship to a large extent
Gold is also used also in the form of chips in the paint with gold writing and gold and gold derivatives are used in a color glass red and potassium cyanide is used with added gold in the gold plating process that is electrically
As well as gold is used in medicine because it is proven that it is compatible with the organs of the body of living it is used in dentistry, and pharmaceutical packaging. Also used radioactive isotopes of gold in biological research in the treatment of cancer
And uses the bulk of the gold produced in the currency and jewelry and to meet these purposes, mix gold metals other up to the hardness required and reflects the gold found in this mixture carat and contains gold used in jewelry industry for copper and silver, while a white gold, zinc, nickel or metals of the platinum
