cracking imp.

• What is cracking in chemistry?

  Splitting up long chain hydrocarbons
• What type of reaction is cracking?

  It is a form of thermal decomposition
• What does thermal decomposition mean?

  A single substance breaks down into at least 2 substances
• Why is cracking useful?

  Because fuels like diesel and petrol are in higher demand
• What conditions are used in cracking vaporised hydrocarbons?

  About 400-700°C and 70 atm
• What is the catalyst used in cracking?

  Aluminium oxide
• How do long chain molecules behave during cracking?

  They split on the surface of the catalyst
• What does incomplete combustion produce?

  Carbon monoxide and soot
• How do the products of incomplete combustion compare to complete combustion?

  They contain less oxygen than complete combustion products