HIGHER TIER UNIT 2 SCIENCE

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1. how do plant fertilisers increase crop yield?

  • fertilisers replace essential elements used by previous crop / provide extra essential elements + used to build plant amino acids
  • they contain potassium
  • fertilisers contain essential minerals
  • fertilisers contain essential nutrients
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2. write the balanced symbol equation for N2+H2-->NH3

  • N2+3H2-->2NH3
  • N+H-->NH
  • N2+H2-->NH4
  • N2+H2-->N2H2

3. why is high pressure needed?

  • increases of yield
  • speeds up reaction
  • makes the temperature higher
  • reduces activation activity

4. Explain how proteins in the leaves change into nitrates

  • they become nitrates from proteins
  • leaves decay then ammonia forms nitrifying bacteria converting into ammonia nitrate
  • proteins become acids that become nitrates
  • they shrivel into nitrates

5. Why is a catalyst used for?

  • speeds reaction
  • high pressure
  • gives reduced yield
  • higher rate of reaction

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