Silver

From NOWA-CL
Jump to navigation Jump to search
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.
 
Silver
Chemical formula Ag
Atomic Number 47 
OTP appearance silver solid 
Molar Mass(g/mol) 107.9 
Density(g/cc) 10.49 
Melting Point(°C) 961.8 
Boiling Point(°C) 2162 
Coefficient of Thermal Expansion(×10-6 °C-1) 19.7
NFPA 704
NFPA704.png
0
1
0
 

Silver is one of the seven metals of antiquity. Along with gold and platinum it is considered one of the noble metals.

Uses

Justification Questioned

Other

  • as an excellent conductor
  • as a catalyst for the decomposition of hydrogen peroxide
  • in an amalgam composed of 40-70% silver, 0-30% tin, 2-40% copper and 0-2% zinc mixed with an equal mass of mercury, is used for dental fillings
  • -oxide and -peroxide are used for high charge density voltaic cells

Natural Occurrence

  • Elemental silver does occur naturally
  • Elemental silver occurs as an impurity in gold
  • Silver occurs as a substitution impurity in lead ores such as galena
  • Silver occurs as a substitution impurity in copper ores such as chalcopyrite

Hazards

Production

Extraction

From silver compounds

Simple heating. (2 Ag2O 2 Ag + O2 @ 280°C)

From lead bodies

See Parkes process and Cupellation.

See Also

References