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Which element is particularly needed for protein production in plants?
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?
Which of these pairs of substances would produce potassium nitrate when reacted together?
Potassium carbonate and sulfuric acid
Potassium hydroxide and hydrochloric acid
Potassium hydroxide and nitric acid
Why are the potassium nitrate crystals filtered out of the solution before all the water has evaporated?
To leave impurities behind in the solution
To stop the crystals from melting
Because there's no more potassium nitrate in the solution
Calculate the percentage of nitrogen in ammonium nitrate, NH4NO3. (N=14, H=1, O=16)