Worksheet: Water Purification

In this worksheet, we will practice describing methods of water purification and explore their advantages, limitations, and common applications.


Potable water must be sterilized before it can be drunk. Which of the following is not a common treatment agent in the production of potable water?

  • AChlorine
  • BOzone
  • CUltraviolet light
  • DCalcium carbonate


Which of the following is not a source of fresh water?

  • AOceans
  • BAquifers
  • CLakes
  • DRivers
  • ERainwater


When preparing potable water from freshwater sources, the water is first passed through a coarse screen. What is the purpose of this screen?

  • ATo help oxygen dissolve in the water
  • BTo neutralize acid in the water
  • CTo catalyze the breakdown of contaminants
  • DTo mix the water thoroughly
  • ETo removed large objects from the water

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