Cards (12)

    • what is the difference between alkanes and alkenes
      alkanes only have single covalent bonds between the carbon atoms whereas alkenes have at least one double covalent bond between the carbon atoms
    • why do long chain hydrocarbons not make a good fuel
      they arent very flammable
    • why is it a problem that long chain hydrocarbons dont make good fuels
      theres a high demand for short chain hydrocarbons to be used as fuels
    • how do you solve the problem of there being a high demand for short chain hydrocarbons but there arent any
      convert long chain hydrocarbons to short chain hydrocarbons using cracking
    • what are shorter chain alkanes used for
      fuels eg in cars
    • what happens in the reaction of cracking
      a different type of molecule was made called an alkene
    • what are the 2 types of cracking
      -catalyctic cracking
      -steam cracking
    • what happens in catalyctic cracking
      we use high temperature and a catalyst, the job of the catalyst is to speed up the reaction
    • what happens in steam cracking
      we use high temperature and steam
    • what are alkenes used for
      -used to make chemicals called polymers
      -used as the starting material for other useful chemicals as well
    • what is one key fact about alkenes
      they are more reactive than alkanes
    • how do we test for alkenes
      -using bromine water which is orange
      -if we shake the bromine water and it turns colourless alkene is present
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