Chemistry C3 2.4 Water issues.

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What can water be treated for?
To remove hardness, to remove harmful microbes and to improve dental health.
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What must be carefully considered before any decision to treat water is taken?
The advantages and disadvantages, this is particularly important for the treatment of public water supplies.
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What does the hardness of the water supplied depend on?
Where you live.
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What problems can hard water cause?
It causes problems in heating systems and with washing.
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What benefits does hard water have?
It has health benefits.
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What can you do if water is not suitable for a particular purpose?
You can treat the water or use an alternative supply.
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Why is chlorine used to treat water?
It is particularly effective in killing microbes.
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What is the disadvantage of using chlorine to treat water?
Chlorine is poisonous and it can produce other toxic compounds, therefore its use must be carefully controlled to minimise the risks.
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Why are fluoride compounds added to water supplies?
To help prevent tooth decay, fluoride is also added to toothpastes.
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There are arguments for and against adding fluoride to water supplies, what is one of the main arguments against?
People should be able to choose whether to take extra fluoride or not.
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What are the advantages of softening hard water?
Soft water uses less soap, does not produce scum and reduces the effects on heating systems.
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What are the disadvantages of softening hard water?
Soft water has reduced health benefits and the process costs money.
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What would be the consequences of not adding chlorine to tap water?
Increased health risks and more (water-borne) spreading of disease.
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What would be the consequences of not adding fluorine to water?
More tooth decay or poorer dental health.
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Other cards in this set

Card 2

Front

What must be carefully considered before any decision to treat water is taken?

Back

The advantages and disadvantages, this is particularly important for the treatment of public water supplies.

Card 3

Front

What does the hardness of the water supplied depend on?

Back

Preview of the front of card 3

Card 4

Front

What problems can hard water cause?

Back

Preview of the front of card 4

Card 5

Front

What benefits does hard water have?

Back

Preview of the front of card 5
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