2006-09-11 23:24:45 · 8 answers · asked by Anonymous in Education & Reference ➔ Homework Help
Gold is a chemical element in the periodic table with the symbol Au and atomic number 79. Gold does not react with most chemicals but is attacked by chlorine, fluorine, aqua regia and cyanide and dissolves in mercury. In particular, gold is insoluble in nitric acid, which will dissolve most other metals. Nitric acid has long been used to confirm the presence of gold in items.
It is the most malleable and ductile metal known; a single gram can be beaten into a sheet of one square meter, or an ounce into 300 square feet. Gold readily forms alloys with many other metals. These alloys can be produced to increase the hardness or to create exotic colors. Adding copper yields a redder metal, iron blue, aluminium purple, platinum metals white, and natural bismuth together with silver alloys produce black. Native gold contains usually eight to ten per cent silver, but often much more — alloys with a silver content over 20% are called electrum. As the amount of silver increases, the color becomes whiter and the specific gravity becomes lower.
Gold is a good conductor of heat and electricity, and is not affected by air and most reagents. Heat, moisture, oxygen, and most corrosive agents have very little chemical effect on gold, making it well-suited for use in coins and jewelry; conversely, halogens will chemically alter gold, and aqua regia dissolves it.
Recent research undertaken by Frank Reith of the Australian National University shows that microbes play an important role in the formation of gold deposits, transporting and precipitating gold to form grains and nuggets that collect in alluvial deposits. [1]
The concentration of free electrons in gold metal is 5.90×1022 cm-3.
2006-09-15 00:45:16 · answer #1 · answered by Henry 5 · 0⤊ 1⤋
Gold is a metallic element with a characteristic yellow color, but can also be black or ruby when finely divided, while colloidal solutions are intensely colored and often purple.
It is the most malleable and ductile metal known.
Gold readily forms alloys with many other metals. These alloys can be produced to increase the hardness or to create exotic colors.
Gold is a good conductor of heat and electricity, and is not affected by air and most reagents.
PS: For detailed info about these characteristics, go to :
http://en.wikipedia.org/wiki/Gold#Notable_characteristics
2006-09-12 00:14:38 · answer #2 · answered by sa_cool 2 · 0⤊ 0⤋
It is almost totally immune to decay, it is not very useful in any industrial/chemical processes which use it up and it is easy to store cheaply for long periods. It is also remarkable for its rarity, density, softness, and its very good electrical conductivity. Gold finds a small number of industrial uses arising from its physical qualities. It is used in dentistry and in the manufacture of some electronics which require high quality non-corrosive contacts. However together its practical uses are numerically insignificant. Gold's principal use is decorative.
2006-09-11 23:32:12 · answer #3 · answered by Dave 2 · 0⤊ 0⤋
Gold is a noble metal. It does not react with any substance. It does not corrode. It is used for making jewelery as it shines and is non-corrosive. It dissolves in Aqua Regia a solution of Hydrocloric acid & Nitric acid. Thats all i have done your home work. It is soft, easily malleable and ductile.
2006-09-11 23:31:45 · answer #4 · answered by Ashu 3 · 0⤊ 0⤋
Flexibility/malleability
Luster
durability
2006-09-11 23:55:38 · answer #5 · answered by Sherry K 5 · 0⤊ 0⤋
this is great! in the beginning up, it style of feels lighthearted, however the 2nd stanza is going right into a deeper meaning that resonates with every person who has ever had a overwhelm or dated. stable use of adjectives too.
2016-11-07 04:01:39 · answer #6 · answered by ? 4 · 0⤊ 0⤋
Why don't you do some research instead of relying on strangers who could be wrong?
2006-09-11 23:32:17 · answer #7 · answered by Anonymous · 0⤊ 0⤋
it can shine.
it will not be damaged easily.
it is the best of best jewels in the world.
2006-09-11 23:55:12 · answer #8 · answered by mirchi girl 3 · 0⤊ 0⤋