Which three elements do NPK fertilisers provide?
Sodium, phosphorus and krypton
Niobium, phosphorus and potassium
Nitrogen, phosphorus and potassium
What environmental problem can the overuse of fertilisers cause?
Eutrophication
Acid rain
Global dimming
Which two substances react to make ammonium nitrate?
Ammonia solution and sulfuric acid
Ammonia solution and nitric acid
Sodium hydroxide and nitric acid
What is the formula for ammonium sulfate?
NH4SO4
(NH4)2SO4
NH4(SO4)2
Which raw materials form both reactants for the Haber process?
Nitrogen and air
Natural gas, air and hydrogen
Natural gas, steam and air
What is the temperature used for the Haber process?
450˚C
850˚C
200˚C
In the Haber process, nitrogen and hydrogen react to produce ammonia: N2 + 3H2 ⇌ 2NH3. What is the atom economy of this process?
50%
67%
100%
Hydrogen can be made from the electrolysis of water: H2O → H2 + ½O2. What is the atom economy of this process? (Relative formula masses: H2O = 18.0 and H2 = 2.0)
11.1%
66.7%
5.56%
The higher the pressure, the higher the yield of ammonia in the Haber process. Why is a very high pressure not used?
It is too expensive
The rate of reaction is too slow
The equilibrium position moves too far to the left and reduces the yield
What name is given to the different sequences of reactions that can make a particular substance?
Reaction methods
Reaction pathways
Substance pathways