To make water potable, the amount of ________ need to be drastically reduced.
microbes
2 of 14
What doesn't potable water need to be?
chemically pure
3 of 14
Potable water needs to have the concentration of dissolved _________ and _________ reduced but not eradicated.
minerals and salts
4 of 14
What does the method of producing potable water depend on?
the water available and the local conditions
5 of 14
What type of water is rain?
fresh water
6 of 14
What does fresh water contain low concentrations of?
dissolved substances
7 of 14
What can a suitable source not be near?
a heavily polluted area
8 of 14
What are the steps in the two-step treatment process?
1. Filtration : water is passed through a wire mesh to remove solid particles 2. Sterilization : chlorine gas is added to kill harmful microorganisms
9 of 14
What are the two methods of desalination?
1. Distillation : boiling seawater creates steam which then condenses to give pure water 2. Reverse Osmosis : seawater is passed through a selective membrane that only allows water molecules through
10 of 14
What is the major disadvantage of desalination?
it is very expensive due to needing a high amount of energy
11 of 14
Name three sources of potable water.
fresh water, sea water and waste water
12 of 14
What is the name of the salt in sea water?
sodium chloride
13 of 14
What is another disadvantage of using seawater as a source? ( hint : environment )
it can be difficult to dispose of in a sustainable way which does not harm marine ecosystems
14 of 14
Other cards in this set
Card 2
Front
To make water potable, the amount of ________ need to be drastically reduced.
Back
microbes
Card 3
Front
What doesn't potable water need to be?
Back
Card 4
Front
Potable water needs to have the concentration of dissolved _________ and _________ reduced but not eradicated.
Back
Card 5
Front
What does the method of producing potable water depend on?
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