Standard grade chemistry topic 14 fertilisers mind map

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  • topic 14 fertillisers
    • elements plants need from soil
      • potassium
      • phosphorus
      • nitrogen
      • different plants  need different amounts of each element
        • lack of the elements results in stunted or deformed growth
    • replacing soil nutrients
      • crop rotation
      • add fertilliser
      • grow leguminous plants for a year
        • cheapest for farmers
    • natural fertillisers
      • from the decay of dead plants or animals
      • from the decay of animal waste
    • synthetic fertillisers
      • haber process
        • ammonia from nitrogen and hydrogen
        • N+H-NH
        • iron catalyst
        • high pressure
          • increases yeild
            • moderate temperature
              • ammonia breaks down at higher temperatures
            • iron catalyst
        • moderate temperature
          • ammonia breaks down at higher temperatures
        • unreacted gases are recycled
      • ostwald process
        • oxidising ammonia to make nitric acid
        • nitrogen will not combine with oxgen under normal circumstances
        • catalytic oxidation
        • platinum catalyst
      • ammonium salts
      • phosphates
      • nitrates
      • poatssium salts
      • ammonia can also be produced by mixing ammonia salts with an alkali
        • haber process
          • ammonia from nitrogen and hydrogen
          • N+H-NH
          • high pressure
            • increases yeild
            • unreacted gases are recycled
          • ammonia usually mixed with something else to make fertilliser
          • nitric acid is also produced by dissolving nitrogen dioxide in water
            • ostwald process
              • oxidising ammonia to make nitric acid
              • nitrogen will not combine with oxgen under normal circumstances
              • catalytic oxidation
              • platinum catalyst
            • other uses of nitric acid include dyes, medecine

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