Organic chemistry

• Crude oil - is found in rocks and is a finite resource ( if we keep using it shall run out)
• Hydrocarbons - are molecules made up of hydrogen and carbon atoms only
• Most hydrocarbons include oil are called alkenes
• First four alkenes

  • methane
  • ethane
  • propane
  • butane
• Properties of hydrocarbons

  viscosity - As the size of hydrocarbons molecules increase the molecules get more viscous

  Flammability - short chains of hydrocarbons are extremely flammable

  Boiling point - As hydrocarbon molecules increase the boiling point increases
• Cracking – in cracking a long chain alkane is broken down to produce smaller, more useful molecules
• conditions of cracking

  • Catalytic cracking which uses a high temperature & catalyst
  • Steam cracking, which uses a high temperature & steam
• Test for alkenes

  Using bromine water, once you have shaked your alkene with bromine, it turns colourless