During the treatment of waste water, a liquid called effluent is produced.
Which process does it undergo?
Sedimentation
Anaerobic digestion
Screening
Aerobic digestion
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During the treatment of waste water, a liquid called effluent is produced.
Which process does it undergo?
Sedimentation
Anaerobic digestion
Screening
Aerobic digestion
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A student was investigating the mass of dissolved solids in spring water.
The student carried out the following steps:
The following results were recorded:
What is the mass of solid dissolved in 1 dm3 of the spring water?
0.67 g
13.4 g
33.5 g
67.0 g
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Copper can be extracted from low grade ores using bioleaching.
A leachate solution is produced.
Which process is used to extract the copper from the leachate solution?
Distillation
Cracking
Displacement
Fermentation
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There are many steps involved when treating water.
Which of the answers below is the incorrect reason for the treatment step being carried out?
Treatment | Explanation | |
A | filtration | to remove dissolved solids |
B | desalination | to remove salt |
C | reverse osmosis | to remove salt |
D | sterilisation | to kill bacteria |
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A student carried out a number of chemical tests on a sample of water to determine whether it contained sodium chloride.
Which sample contained sodium chloride?
Flame test colour | Add sodium hydroxide solution | Add nitric acid and silver chloride solution | Add hydrochloric acid and barium chloride | |
A | brick red | no reaction | yellow precipitate | no reaction |
B | yellow | no reaction | white precipitate | no reaction |
C | yellow | no reaction | cream precipitate | no reaction |
D | no colour | green precipitate | no reaction | white precipitate |
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The amount of chlorine used in swimming pools has to be carefully monitored to ensure levels don't get too high.
What is the reason for this?
It is flammable
It is corrosive
It is toxic
It is a diuretic
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