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- 1. Multiple Choice
Farmers add ammonium sulfate to the soil. What is the purpose of this?
A. To add sulfur to the soil.
B. To add nitrogen to the soil.
C. To neutralise excess acid in the soil.
D. To destroy excess lime in the soil.
- 2. Multiple Choice
What are the essential elements found in KNO3 which can help in plant growth?
A. Nitrogen and Oxygen
B. Phosphorus and Nitrogen
C. Potassium and Nitrogen
D. Potassium and Oxygen.
- 3. Multiple Choice
Which compound when reacted with sulfuric acid produces a product which is used as a fertiliser?
A. ammonia
B. calcium carbonate
C. calcium hydroxide
D. sodium hydroxide
- 4. Multiple Choice
Which substance has the highest percentage by mass of nitrogen?
A. NH4NO3
B. (NH3)2SO4
C. CO(NH2)2
D. (NH4)3PO4
- 5. Multiple Choice
All ammonium salts on heating with sodium hydroxide produce ammonia gas.
From which ammonium salt can the greatest mass of ammonia be obtained?
A. 0.5 mol (NH4)3PO4
B. 0.5 mol (NH4)2SO4
C. 1.0 mol NH4Cl
D. 1.0 mol NH4NO3
- 6. Open Ended
6. Farmers that grow vegetable oil crops often use large quantities of ammonium nitrate fertlisers, NH4NO3.
a) Calculate the percentage by mass of nitrogen in ammonium nitrate.
% By mass = _________________
[Mark: 1]
- 7. Open Ended
b) A sample of ammonium phosphate can be produced by the reaction of aqueous ammonia and phosphoric acid.
3NH3(aq) + H3PO4(aq) --> (NH4)3PO4(aq)
25.0 cm3 of 1.25 mol/dm3 phosphoric acid is neutralised by 45.3 cm3 of aqueous ammonia.
i) Calculate the concentration, in mol/dm3, of the ammonia used.
Concentration of ammonia = ____________ mol / dm3
[Mark: 3]
- 8. Open Ended
ii) Show, by calculation, that 4.66 g of ammonium phosphate would be produced. Assume that the yield is 100%. [Mr: (NH4)3PO4, 149]
[Mark: 1]
- 9. Open Ended
iii) In practice, the actual mass of ammonium phosphate produced is 2.93 g. Calculate the percentage yield of ammonium phosphate.
Percentage yield = ____________ %
[Mark: 1]
- 10. Open Ended
7) Urea is a white solid with the formula CO(NH2)2. The compound is used as a fertiliser.
a) Which important element is added to the soil by urea?
[Mark: 1]
- 11. Open Ended
b) Calculate the percentage by mass of nitrogen in urea.
[Mark: 1]
c) Ammonium phosphate is also used as a fertiliser. Calculate the percentage by mass of nitrogen in ammonium phosphate.
[Mark: 1]
d) By comparing your answers in b) and c), decide which fertiliser is better for soil and why?
[Mark: 2]
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