GOLD: Not for the timid and naive who believe the central banks do anything but destroy the purchasing power of currencies.
GOLD: Gold is metallic, with a yellow colour when in a mass, but when finely divided it may be black, ruby, or purple. It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet. It is a soft metal and is usually alloyed to give it more strength. It is a good conductor of heat and electricity, and is unaffected by air and most reagents.
Gold is usually alloyed in jewellery to give it more strength, and the term carat describes the amount of gold present (24 carats is pure gold). It is estimated that all the gold in the world, so far refined, could be placed in a single cube 60 ft. on a side.
The most common gold compounds are auric chloride (AuCl3) and chlorauric acid (HAuCl4). A mixture of one part nitric acid with three of hydrochloric acid is called aqua regia (because it dissolved gold, the King of Metals). It is unaffected by air and most reagents.
Applications
Gold is used as buillon and in jewellery, glass and electronics. Jewellery consumes around 75% of all gold produced. Gold for jewellery can be given a range of hues depending on the metal with which is alloyed (white, red, blue, green etc.). Colloidal gold is added to glass to colour it red or purple, and metallic gold is applied as a thin film on the windows of large building to reflect the heat of the Sun's ray. Gold electroplating is used to in the electronic industry to protect their copper components and improve their solderability. GOLD has also historically used as a medium of exchange or as a backing for paper mediums of exchange.
Atomic number
79
Atomic mass
196.9655 g.mol -1
Electronegativity ccording to Pauling
2.4
Density
19.3 g.cm-3 at 20°C
Melting point
1062 °C
Boiling point
2000 °C
Vanderwaals radius
0.144 nm
Ionic radius
0.137 nm (+1)
Isotopes
7
Electronic shell
[ Xe ] 4f14 5d10 6s1
Energy of first ionisation
888 kJ.mol -1
Energy of second ionisation
1974.6 kJ.mol -1
Standard potential
+1,68 V ( Au+/ Au )
Discovered
c.a. 3000 BC
Gold is usually alloyed in jewellery to give it more strength, and the term carat describes the amount of gold present (24 carats is pure gold). It is estimated that all the gold in the world, so far refined, could be placed in a single cube 60 ft. on a side.
The most common gold compounds are auric chloride (AuCl3) and chlorauric acid (HAuCl4). A mixture of one part nitric acid with three of hydrochloric acid is called aqua regia (because it dissolved gold, the King of Metals). It is unaffected by air and most reagents.
Applications
Gold is used as buillon and in jewellery, glass and electronics. Jewellery consumes around 75% of all gold produced. Gold for jewellery can be given a range of hues depending on the metal with which is alloyed (white, red, blue, green etc.). Colloidal gold is added to glass to colour it red or purple, and metallic gold is applied as a thin film on the windows of large building to reflect the heat of the Sun's ray. Gold electroplating is used to in the electronic industry to protect their copper components and improve their solderability. GOLD has also historically used as a medium of exchange or as a backing for paper mediums of exchange.
Atomic number
79
Atomic mass
196.9655 g.mol -1
Electronegativity ccording to Pauling
2.4
Density
19.3 g.cm-3 at 20°C
Melting point
1062 °C
Boiling point
2000 °C
Vanderwaals radius
0.144 nm
Ionic radius
0.137 nm (+1)
Isotopes
7
Electronic shell
[ Xe ] 4f14 5d10 6s1
Energy of first ionisation
888 kJ.mol -1
Energy of second ionisation
1974.6 kJ.mol -1
Standard potential
+1,68 V ( Au+/ Au )
Discovered
c.a. 3000 BC
posted by Not Sure if Al Gore or Global Warming is a Bigger Joke at
11:11 AM
2 Comments:
"I wish I had a way to turn grams into moles. Oh, I do. It's called the molar mass"
Richard Morgan - Eastwood High Chemistry teacher.
How can you pass up an investment idea with a Vanderwaals radius of .144?
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