Fertilisers typically contain three essential elements. What are they?
Nitrogen, sulfur and oxygen
Nitrogen, phosphorus and potassium
Carbon, nitrogen and oxygen
Which essential elements are provided by the fertiliser potassium nitrate, KNO3?
Potassium and phosphorus
Potassium and nitrogen
Nitrogen and phosphorus
What fertiliser can be made by neutralising potassium hydroxide with phosphoric acid?
Potassium phosphate
Ammonium sulfate
Potassium nitrate
What is the name of the process used to make ammonia?
The contact process
The Ostwald process
The Haber process
Which of these equations best describes the reaction that occurs during the industrial manufacture of ammonia?
N2 + 3H2 ⇌ 2NH3
N2 + 3H2 → 2NH3
2NH3 → N2 + 3H2
Which of the following properties is essential for compounds used in fertilisers?
Fertiliser compounds should be alkaline
Fertiliser compounds should be soluble in water
Fertiliser compounds should have high melting points
Which of these salts could be made from ammonia and nitric acid?
NH4NO3
(NH4)2SO4
KNO3
Which two reactants are needed to make ammonium sulfate in the laboratory?
Ammonia and 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?
Filter it
Use chromatography
Evaporate the water
Why is the industrial manufacture of fertilisers carried out using a continuous process rather than a batch process?
As continuous processes can be carried out at lower temperatures than batch processes.
As continuous processes can produce higher pressures than batch processes.
As continuous process can produce larger quantities of product than batch processes