Chemical elements
  Carbon
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Methane
      Ethylene
      Acetylene
      Coal-Gas
      Carbon Tetrafluoride
      Tetrafluoromethane
      Carbon Tetrachloride
      Tetrachloromethane
      Carbon Tetrabromide
      Tetrabromomethane
      Carbon Tetraiodide
      Tetraiodomethane
      Carbon Oxychloride
      Carbonyl Chloride
      Phosgene
      Carbon Oxybromide
      Carbonyl Bromide
      Carbon Suboxide
      Carbon Monoxide
      Carbon Dioxide
      Percarbonic Acid
      Carbamic Acid
      Carbamide
      Urea
      Carbon Disulphide
      Carbonyl Sulphide
      Carbon Oxysulphide
      Thiocarbonyl Chloride
      Thiocarbonic Acid
      Thiocarbamic acid
      Thiourea
      Thiocarbamide
      Perthiocarbonates
      Carbon Monosulphide
      Carbon Subsulphide
      Carbon Sulphidoselenide
      Carbon Sulphidotelluride
      Carbon Nitrides
      Cyanogen
      Dicyanogen
      Hydrocyanic Acid
      Prussic Acid
      Cyanogen Chloride
      Chlorocyanogen
      Cyanogen Bromide
      Bromocyanogen
      Cyanogen Iodide
      Iodocyanogen
      Polymerised Cyanogen Halides
      Cyanamide
      Cyanic Acid
      Cyanuric Acid
      Cyamelide
      Fulminic Acid
      Thiocyanic Acid
      Sulphocyanic Acid
      Isoperthiocyanic Acid
      Cyanogen Sulphide
      Thiocyanic Anhydride
    Diamonds
    Graphite
    Amorphous Carbon
    Coal

Carbon Tetrabromide, CBr4






Carbon tetra-bromide, CBr4, is prepared similarly to the chloride by the action of bromine on carbon disulphide, iodine being in this case the halogen-carrier. A mixture of 2 parts of carbon bisulphide, 14 parts of bromine, and 3 parts of iodine is heated in a sealed tube for forty-eight hours at 250° C., and the product distilled when cold with sodium hydroxide solution. Carbon tetrabromide is a solid, and crystallises from alcohol in white, glistening tablets having an ethereal smell; it has a density of 3.42, melts at 92.5° C., and boils under atmospheric pressure with partial decomposition at 189.5° C., whilst under 50 mm. pressure the boiling-point is 101° C.

Solid carbon tetrabromide exists in two enantiotropic forms, the transition temperature between which is 46°-47° C.


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