TOPIC 10 - The Global Saviour!1!!1 (Fertilisers)
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The chemist has the important role in making sure
plants have the correct nutrients to ensure sufficient food production.
Key elements which provide nutrients required for plant growth:
nitrogen, phosphorus and potassium.
Fertilisers can be produced
naturally or in a lab using neutralisation reactions
The Haber process can be
reversed
At high temperatures the rates of both the forwards and backwards reactions for the Haber process
are increased; however, the backwards reaction is more dominant.
ammonia is the staring material for the commercial production of
nitric acid which is used to produce ammonium nitrate.
The Haber process is used to produce
ammonia
Using fertilisers may have an impact
environmentally
analytical techniques: (5)
Colourimetry, flame tests, pH measurements, titrations, precipitation reactions
water becomes polluted by mud containing
metals that are harmful to us
the soil in developing countries lacks
the essential nutrients that plants require to grow healthily
Nitrogen is essential for (1)
growth
Potassium is essential for (2)
respiration and photosynthesis
Phosphorus is essential for (2)
respiration and growth
effect of being deficient in Nitrogen (2)
poor growth and discoloured leaves
effect of being deficient in Potassium (1)
poor fruit/flower growth
effect of being deficient in Phosphorus (2)
poor root growth and discoloured leaves
what is a fertiliser
a natural or manmade compound which contains one or more of the essential elements potassium, phosphorus or nitrogen
KPO4
potassium phosphate
NH4Cl
ammonium chloride
NH4NO3
ammonium nitrate
(NH4)2SO4
ammonium sulphate
KNO3
potassium nitrate
CO(NH2)2
urea