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Fertilisers contain elements which are essential for the healthy growth of crops. Fertilisers can be made in the laboratory and on a larger scale by the chemical industry.
Fertilisers typically contain three essential elements. What are they?
Nitrogen, sulfur and hydrogen
Nitrogen, phosphorus and potassium
Carbon, hydrogen and oxygen
Which essential elements are provided by the fertiliser potassium nitrate, KNO3?
Potassium and phosphorus
Potassium and nitrogen
Nitrogen and phosphorus
What useful compound is produced when phosphate rock is reacted with phosphoric acid?
What is the name of the process used to make ammonia?
The contact process
The Ostwald process
The Haber process
What kind of catalyst is used in the Haber process?
What is the typical pressure used in the Haber process?
What is the typical temperature used in the Haber process?
What is ammonia reacted with to produce nitric acid?
Which two reactants are needed to make ammonium sulfate in the laboratory?
Ammonia sulfuric acid
Sulfuric hydroxide and ammonium acid
Ammonium and sulfur
A student has prepared a solution of ammonium sulfate. What should she do to prepare dry crystals of ammonium sulfate?
Evaporate the water