HIGHER TIER UNIT 2 SCIENCE

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1. Explain how proteins in the leaves change into nitrates

  • proteins become acids that become nitrates
  • leaves decay then ammonia forms nitrifying bacteria converting into ammonia nitrate
  • they shrivel into nitrates
  • they become nitrates from proteins
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2. Write about biochemical adaptations to very cold climates.

  • enzymes spread easier on smaller surface areas
  • larger leaves absorb more sunlight
  • contain enzymes with lower optimum temperatures but cells do not freeze as freezing would damage cells
  • The smaller the plant the less energy is needed so more can be spent on specific parts of the plants

3. Why is a catalyst used for?

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

4. Why do scientists publish their results?

  • so other scientists can gather further evidence or further their own work. so they can gain credit for their work or so work can be checked
  • So scientists can use them as decoration
  • So people know that work was actually done
  • To keep in a book

5. write the balanced symbol equation for N2+H2-->NH3

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

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