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Chemistry Paper 2 > Water > Flashcards

Water Flashcards

1
Q

What can drinking water not have

A
  • low levels of dissolved salts

- low levels of microbes

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2
Q

What is later safe to drink called

A

Potable water

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3
Q

Why is pure and potable water not the same thing

A

Pure water contains no dissolved substances but potable water does

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4
Q

Sources of fresh water

A

Aquifers
Lakes
Rivers

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5
Q

Steps for fresh water

A

Filtration - to remove suspended material

Sterilisation - chlorine/ ozone light to kill microbes

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6
Q

How to make sea water drinkable

A

Desalination

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7
Q

ways to make sea water drinkable

Why not?

A

Distillation
Reverse osmosis
Lots of energy which is expensive

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8
Q

Why is waste water harder to process then fresh water

A

More processes

More microbes and more organic matter

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9
Q

How to determine wether water is pure

A

Determine boiling point

Should be at 100

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10
Q

Waste water treatment

A

Screened - passed through mesh to remove solids
Settle in sedimentation tank
Liquid effluent and solidsludge

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11
Q

What happens to semi solid sludge

A

Digested anaerobic bacteria - produces biogas to burn for electricity
Digested sludge then used as fertiliser

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12
Q

What does liquid effluent contain

A

Lots of organic molecules

Harmful microorganisms

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13
Q

What happens to liquid effluent

A

Air is bubbled through this allows AEROBIC BACTERIA. After can be put back into rivers etc

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14
Q

Problem with low grade ores

A

Contain little copper

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15
Q

What is phytomining

A

Plants are grown in ground which contains the metal

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16
Q

Steps phytpmining

A

Grown in areas with lots of the metal ore
That’s all the metal compound and concentrated in its tissue
Harvested and burned
Ash contains high concentration

17
Q

What is bioleaching

A

Using bacteria

18
Q

Bioleaching steps

A

Bacteria mixed with the low grade ore

Produce leachate with ore

19
Q

What do we have at the end of photomining and bioleaching

A

Metal compound need to extra metal

20
Q

How to. Displace if copper

A

Using scrap iron because it is more reactive and cheap

Electrolysis

21
Q

What is potable water

A

Water that is safe to drink

22
Q

Purpose of making potable water

A

Reduce levels of dissolved substances

Chemistry Paper 2 (16 decks)

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