Chemical elements
    Physical Properties
    Chemical Properties
      Carbon Tetrafluoride
      Carbon Tetrachloride
      Carbon Tetrabromide
      Carbon Tetraiodide
      Carbon Oxychloride
      Carbonyl Chloride
      Carbon Oxybromide
      Carbonyl Bromide
      Carbon Suboxide
      Carbon Monoxide
      Carbon Dioxide
      Percarbonic Acid
      Carbamic Acid
      Carbon Disulphide
      Carbonyl Sulphide
      Carbon Oxysulphide
      Thiocarbonyl Chloride
      Thiocarbonic Acid
      Thiocarbamic acid
      Carbon Monosulphide
      Carbon Subsulphide
      Carbon Sulphidoselenide
      Carbon Sulphidotelluride
      Carbon Nitrides
      Hydrocyanic Acid
      Prussic Acid
      Cyanogen Chloride
      Cyanogen Bromide
      Cyanogen Iodide
      Polymerised Cyanogen Halides
      Cyanic Acid
      Cyanuric Acid
      Fulminic Acid
      Thiocyanic Acid
      Sulphocyanic Acid
      Isoperthiocyanic Acid
      Cyanogen Sulphide
      Thiocyanic Anhydride
    Amorphous Carbon

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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