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Science

Chemical economics

Fertilisers and crop yield - higher tier - Test

1.

Which element is particularly needed for protein production in plants?

2.

What name is given to the process which leads to a shortage of oxygen in lakes and rivers and hence the death of most aquatic life?

3.

Which of these pairs of substances would produce potassium nitrate when reacted together?

4.

Why are the potassium nitrate crystals filtered out of the solution before all the water has evaporated?

5.

Calculate the percentage of nitrogen in ammonium nitrate, NH4NO3. (N=14, H=1, O=16)