What term is used to describe water that is safe for humans to drink?

• Potable

• Clear

• Colourless

Which of the following could be harmful for humans if consumed in drinking water?

• Carbon dioxide

• Dissolved salts

• Oxygen

Which solute is present in the highest quantity in sea water?

• Sodium chloride

• Sodium carbonate

• Sodium hydrogencarbonate

Which of the following substances is removed by filtration?

• Dissolved salts

• Insoluble particles

• Microbes

What is the name of the process that kills microbes during water purification?

• Sterilisation

• Precipitation

• Crystallisation

Which of the following is not a method used to kill microbes during water purification in the UK?

• Chlorine

• Boiling

• UV light

Which process is used to make drinking water from sea water?

• Filtration

• Chlorination

• Desalination

Which process uses high pressure and a porous membrane to purify water?

• Distillation

• Precipitation

• Reverse osmosis

Which of these is most likely to be a pollutant in agricultural waste water?

• Fertiliser

• Sodium chloride

• Lead compounds

What is the name of the process used to purify water which involves boiling the water and then cooling it to condense the vapour?

• Distillation

• Chromatography

• Crystallisation