(a) describe the use of nitrogen, from air, and hydrogen, from cracking oil, in the manufacture of
ammonia
(b) state that some chemical reactions are reversible (e.g. manufacture of ammonia)
(c) *describe and explain the essential conditions for the manufacture of ammonia by the Haber
process
(d) describe the use of nitrogenous fertilisers in promoting plant growth and crop yield
(e) compare nitrogen content of salts used for fertilisers by calculating percentage masses
(f) describe eutrophication and water pollution problems caused by nitrates leaching from farm land and
explain why the high solubility of nitrates increases these problems
(g) describe the displacement of ammonia from its salts and explain why adding calcium hydroxide to
soil can cause the loss of nitrogen from added nitrogenous fertiliser
ammonia
(b) state that some chemical reactions are reversible (e.g. manufacture of ammonia)
(c) *describe and explain the essential conditions for the manufacture of ammonia by the Haber
process
(d) describe the use of nitrogenous fertilisers in promoting plant growth and crop yield
(e) compare nitrogen content of salts used for fertilisers by calculating percentage masses
(f) describe eutrophication and water pollution problems caused by nitrates leaching from farm land and
explain why the high solubility of nitrates increases these problems
(g) describe the displacement of ammonia from its salts and explain why adding calcium hydroxide to
soil can cause the loss of nitrogen from added nitrogenous fertiliser
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