Chemistry 3.3 - Fertilisers

• What are the three essential elements for fertilisers?

  Nitrogen, Potassium, Phosphorus
• Fertilisers need?

  • An essential element
  • To be soluble
• Ammonia formula?

  NH3
• Haber process equation?

  N2 + 3H2 ->-< 2NH3

  nitrogen + hydrogen ->-< ammonia
• What is the catalyst in the Haber process?

  iron
• The yield of ammonia is increased by decreasing temperature and increasing pressure
• Is ammonia acid or alkaline?

  Ammonia is alkaline
• Why is the commercial production of NO2 bad?

  • Too expensive
  • Too much energy
  • Doesn't make much NO2
• How is nitrogen dioxide produced?

  The catalytic oxidation of ammonia
• Ostwald process?

  NH3 + O2 -> NO2

  NO2 + H20 -> HNO2
• What is the catalyst in the Ostwald process?

  Platinum
• The Ostwaldd process is exothermic