organic chemistry

• what is meant by the term isomerism


  same molecular formula but different displayed formula
• give the general formula for alkenes


  CnH2n
• meaning of hydrocarbons


  compound only made of hydrogen and carbon
• order of crude oil seperation

  (top - cool) refinery gases - cooking

  gasoline - fuel for cars

  kerosene - fuel for planes

  diesel - fuel for large vehciles

  fuel oil - fuel for ships

  (bottom - very hot) bitumen - road surfacing