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

Cyamelide, (CONH)n

Cyamelide, (CONH)n, a polymer of cyanic acid of unknown molecular weight, is formed from this acid at 0° C. by spontaneous polymerisation with evolution of heat and light, and may also be prepared by gently heating a mixture of equal parts of potassium cyanate and oxalic acid. It is a white amorphous powder, which, in accordance with high molecular weight, is insoluble in water and other solvents; its density at 0° C. is 1.974; its heat of formation per gram is 1362 calories; and its heat of combustion 1630 calories. The heat of transformation of cyamelide into cyanuric acid is - 9600 calories. Cyamelide dissolves in alkalis, forming cyanates; it dissolves in sulphuric acid unchanged, whence it may be precipitated by water, but when warmed with the concentrated acid it passes into cyanuric acid, and eventually into carbon dioxide and ammonia.

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