AQA GCSE Chemistry

Topic Questions

10.1 Global Reserves & Potable Water

11 mark

During the treatment of waste water, a liquid called effluent is produced.

Which process does it undergo?

  • Sedimentation

  • Anaerobic digestion

  • Screening

  • Aerobic digestion

Did this page help you?

2
Sme Calculator
1 mark

A student was investigating the mass of dissolved solids in spring water.

The student carried out the following steps:

  • Measure the mass of an empty evaporating basin
  • Add 50 cm3 of spring water
  • Heat up the water sample until it evaporates
  • Reweigh the evaporating basin containing the solid

The following results were recorded:

  • Mass of empty evaporating basin = 19.56 g
  • Mass of evaporating basin and dry solid residue = 20.23 g

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

Did this page help you?

31 mark

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

Did this page help you?

41 mark

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
B sterilisation to kill bacteria 

Did this page help you?

5
Sme Calculator
1 mark

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 

Did this page help you?

61 mark

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 

Did this page help you?