Silicon

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Silicon
Chemical formula Si
Atomic Number 14 
OTP appearance black solid 
Molar Mass(g/mol) 28.0 
Melting Point(°C) 1414 
Boiling Point(°C) 3265 
Density(g/cc) 2.33
NFPA 704
NFPA704.png
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Uses

Justifying

  • -dioxide is the key component of glass

Other

  • Semiconductor substrate
  • Feedstock for silicone
  • -carbide is an excellent abrasive, high temp ceramic, semiconductor "detector"
  • -dioxide accepts CaO (SiO2 + CaO CaSiO3)

Natural Occurrence

Hazards

Production

Extraction

  • from dioxide via high temp (1900°C) carbothermal reduction
    SiO2 + 2 C Si + 2 CO
  • from -fluoride with potassium via halide stealing
    SiCl + K Si + KCl

via silicides

In an article

  1. Combine finely ground sand, [[quartz], or quartzite with magnesium metal powder, and heat, yielding magnesium silicide, magnesium oxide, and unreacted magnesium and silicon dioxide
    2 Mg + SiO2
    {
    heat}
    2 MgO + Si
    2 Mg + Si
    {
    heat}
    M2Si // follows from reaction above
    4 Mg + SiO2
    {
    heat}
    2 MgO + Mg2Si // overall reaction
  2. Combine products with dilute hydrochloric acid

Purification

Testing

Sttorage

Disposal

See Also

References