Chemical elements
    Physical Properties
    Chemical Properties
        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

Acetylene, C2H2

Acetylene or Ethine was discovered by Edmund Davy in 1836, but was first investigated by Berthelot, to whom the name Acetylene is due. Berthelot produced this gas synthetically by striking the electric arc between carbon poles in an atmosphere of hydrogen:

2C + H2 = HCCH.

Bone and Jerdan have investigated this action and find that methane and ethane are also produced, so that when equilibrium is attained the issuing gas has the following approximate composition:

Hydrogen90-91 %
Acetylene7-8 %
Methane1.25 %
Ethane0.75 %

They are of opinion that these hydrocarbons are produced synthetically and independently, so that the acetylene does not result from the thermal decomposition of the other hydrocarbons.

It was further shown by Berthelot that acetylene is produced when ethylene or the vapour of alcohol is passed through a red-hot tube, and also by the action of electric sparks on methane, ethylene, or a mixture of cyanogen and hydrogen. The formation of acetylene from ethylene by the action of heat has been confirmed by Bone and Coward, but the same observers have shown that methane does not produce acetylene by thermal decomposition.

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