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Purifying and Testing Water

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gcse Chemistry Mindmap am Purifying and Testing Water, erstellt von k m am 19/06/2013.

Mindmap von k m, aktualisiert more than 1 year ago

	Erstellt von k m vor etwa 12 Jahre

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Zusammenfassung der Ressource

Purifying and Testing Water

water
1. lakes
2. rivers
3. reservoirs
4. aquifiers
  1. wells
  2. bore holes
5. uses
  1. drinking
  2. washing
  3. household jobs
  4. industry
    1. cooling
    2. solvent
    3. raw material
6. some parts of Britain: demand higher than supply
water treatment
1. to purify it
  1. safe to drink
2. untreated contains
  1. microbes
  2. pollutants
  3. insoluble particles
  4. dissolved salts and minerals
3. process
  1. 1) sedimentation
    1. insoluble particles sink
  2. 2)filtration
    1. remove very fine particles
  3. 3) chlorination
    1. kill microorganisms
water purification
1. tap water contains soluble materials
  1. not removed in water treatment
2. distilled
  1. lots of energy
    1. expensive
  2. huge amounts of energy would be needed to distil sea water
    1. costly
    2. expensive equipment
    3. menas making drinking water from sea water is prohibited
pollution in water
1. nitrates
  1. fertiliser
2. lead compunds
3. pesticides
  1. spraying crops
4. difficult to remove
dissolved ions
1. dissolved ions of some salts: easy to identify
  1. precipitation reactons
    1. insoluble solid from mixing 2 solutions
2. barium chloride
  1. detect sulfates
    1. form barium sulfate
      1. white precipitate
3. silver nitrate
  1. detect halide ions
    1. chlorides
      1. white pecipitate
    2. bromides
      1. cream precipitate
    3. iodides
      1. pale yellow precipitate

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