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On television you see many examples
of famine and disaster in the world.
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Often a lack of pure water is
associated with the disaster.
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This unit develops ideas about the importance
of clean water both in the United Kingdom and in the developing nations of
the world.
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The purification of water is considered as well as simple ways to test for dissolved
substances in water.
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Suggested practical and research activities to
revise from
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Use text-books, video and/or
internet and information from local water companies to find out
about the water resources in the United Kingdom and the need to conserve water.
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Research
the pollutants found in water.
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Visit a water purification plant.
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Design a poster to describe the
purification of domestic water.
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Investigating the solution chemistry of some dissolved ions.
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Preparation of an insoluble salt
eg barium sulfate, by precipitation, filtration, washing and
drying.
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Be able to interpret simple data about water resources in the United Kingdom (no
Know is
expected).
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Know different types of water resources found in the United
Kingdom:
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lakes
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rivers
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aquifers
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reservoirs.
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Be able to explain why water is an
important resource for many important industrial chemical processes.
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Know some of the pollutants that may be found in
domestic water supplies:
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nitrate residues
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lead compounds
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pesticide
residues.
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Be able to describe the
purification of domestic water.
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Know the types of substances present in water
before it is purified:
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Know that chlorination kills
microbes in water.
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Know that barium chloride solution is used to test for sulfate ions
and gives a white precipitate.
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Know that silver nitrate solution is used to test
for halide ions:
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chloride ions give a white precipitate
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bromide ions give a
cream precipitate
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iodide ions give a pale yellow precipitate.
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Be able to construct word
equations for the reactions of barium chloride with sulfates and silver nitrate
with halides (all reactants and products given).
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Be able to interpret data about water resources in the
United Kingdom (no recall is expected).
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Be able to explain why it is important to
conserve water.
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Be able to explain why drinking water may contain some of the
pollutants listed below:
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nitrates
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lead compounds
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pesticides
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Be able to describe
the water purification process to include filtration, sedimentation and chlorination.
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HT only: Be able to
explain why some soluble substances
are not removed from water during purification.
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HT only: Be able to
explain the disadvantages of
using distillation of sea water to make large quantities of fresh water.
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Be able to interpret data about the testing of water with aqueous silver nitrate and
barium chloride solutions.
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Be able to construct word equations for the reactions of
barium chloride with sulfates and silver nitrate with halides (not all
reactants and products given).
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Understand that the reactions of barium
chloride with sulfates and silver nitrate with halides are examples of
precipitation reactions.
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HT only: Be able to construct balanced symbol equations for the
reactions of barium chloride with sulfates and silver nitrate with halides
given the appropriate formulae.
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Revision NOTES and QUIZZES:
