Metals, Plastics, Fertilisers, Nuclear Chemistry Worksheet - National 5 Unit 3 Page 8
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13Exercise 7 – Fertilisers Revision
1. Fertilisers are compounds which restore to the soil essential elements for plant
growth.
a) Name three elements which are restored to the soil through the use of fertilisers.
b) Explain how synthetic fertilisers are produced, mention the chemical reaction
involved.
c) Natural fertilisers can be used by farmers as an alternative to synthetic
fertilisers. Suggest another way farmers can improve the soil without using
synthetic fertilisers.
2. Calculate the % mass composition of nitrogen in the following compounds:
a) KNO
3
b) (NH
)
(PO
)
4
3
4
c) Calcium nitrate
d) Ammonium nitrate
3. Potassium nitrate fertiliser can be produced by reacting potassium hydroxide with
nitric acid. Water is also formed.
a) Write this reaction as a word equation.
b) Write out a balanced ionic equation for this reaction.
c) Identify the spectator ions.
d) Name the type of chemical reaction that is taking place.
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