10.2. Fertilisers
A subsection of Chemistry, 5070, through 10. Chemistry of the environment
Listing 10 of 25 questions
Ammonia, NH3, is used to make nitrogenous fertilisers. Ammonia is manufactured using the reversible reaction between nitrogen and hydrogen. Construct the equation for this reversible reaction. Ammonia is used to make the soluble salt ammonium nitrate, NH4NO3. Name the acid that reacts with ammonia to make ammonium nitrate. Calculate the percentage by mass of nitrogen in ammonium nitrate. percentage by mass = Nitrogenous fertilisers such as ammonium nitrate leach from farmland and cause water pollution problems in rivers and lakes. Name the process caused by this type of water pollution. Explain why this type of water pollution problem is increased when nitrate fertilisers are used instead of other fertilisers. A farmer adds ammonium nitrate, NH4NO3, to soil. The farmer then adds calcium hydroxide, Ca(OH)2, to the same soil. State the purpose of adding calcium hydroxide to soil. Construct the equation for the reaction between ammonium nitrate and calcium hydroxide. Using your equation, explain why the ammonium nitrate fertiliser is less effective after calcium hydroxide is added.
5070_s22_qp_21
THEORY
2022
Paper 2, Variant 1
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Questions Discovered
25