Taylor High School
Chemistry Department
Homework
Unit 3
Chemistry in Society
Fertilisers N4/N5
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1.
The graph shows the trend in both the world population and fertiliser
production.
Why has an increase in world population led to an increase in fertiliser
production?
2.
The grid shows the name of some chlorides.
Identify the chloride which could be used as a fertiliser.
3.
Name the three essential elements needed for healthy plant growth?
4.
Name the essential element needed for healthy plant growth provided by
ammonium compounds. You may wish to use the data booklet to help you.
5.
Why are fertilisers added to soil?
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6.
Nodules in certain plants contain organisms which are able to convert nitrogen
from the atmosphere into nitrogen compounds.
(a)
What type of organism is present in these nodules?
(b)
Where in the plant are these nodules found?
7.
Nitrogen is an essential element.
Name one other essential element required for healthy plant growth.
8.
Potassium hydroxide reacts with sulfuric acid to form potassium sulfate,
which can be used as a fertiliser.
KOH
9.
10.
+
H2SO4
K2SO4
+
H 2O
(a)
Copy the above equation and balance it.
(b)
Name the type of chemical reaction taking place.
(c)
Calculate the percentage, by mass, of potassium in potassium sulphate,
K2SO4.
State the chemical test, including the result, for ammonia gas.
Ammonia can be used to produce nitrogen dioxide as shown.
(a)
Name catalyst Y.
(b)
Why is it not necessary to continue to supply heat once the reaction
has started?
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11.
(a)
(b)
(c)
Name the gas produced in the Haber Process.
Name the element used as the catalyst in the Haber Process.
Name the element used as the catalyst in the manufacture of nitric
acid (Ostwald Process).
12.
The nitrogen compound produced in the Haber Process dissolves in water.
The graph shows the solubility of the nitrogen compound at different
temperatures.
Write a general statement describing the effect of temperature on the
solubility of the nitrogen compound.
13.
The flow chart shows some processes which take place in an industrial
chemical complex.
a) Air and water are used as raw materials because they contain the
elements needed to make ammonia.
Suggest one other reason why they are used as raw materials.
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b) Which reactant for the ammonia plant must be produced in the reaction
between North Sea gas and water?
c) Name the salt formed in the fertiliser plant.
d) The graph shows the different percentage yields of ammonia which can be
obtained under different conditions in the ammonia plant.
(i) What is the relationship between the percentage yield of ammonia
and the temperature at constant pressure?
(ii) Explain why all of the nitrogen and hydrogen are not converted to
ammonia.
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14.
Ammonium compounds can be identified by heating them with soda lime.
Ammonia gas will be released.
a) Describe a test that could be carried out to detect and identify the
ammonia gas produced.
b) An ammonium compound was dissolved in water.
A precipitate was produced when this solution was added to a solution of
barium chloride.
Suggest a name for this compound.
(You may wish to use your data book to help you.)
15. Catalysts can be used in different processes.
Copy the flow diagram and add an arrow to show how the process could be
made more economical.
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