chemistry - water

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what is the difference between soft and hard water?
soft water lathers with only a little soap, hard water uses more soap and produces scum
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whats the difference between sum and scale?
scum if formed when soap reacts with compounds in hard water, scale is produced when temporary hard water is heated or boiled.
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why is it better to drink hard water rather then soft?
hard water contains calcium compounds that are good for heath, for the teeth and bones and reduce the risk of heart disease
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what is meant by temporary hard water?
water that is soften by heating or boiling
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how does ion-exchange resin soften hard water?
ion-exchange resin removes calcium and magnesium ions from hard water and replaces them with sodium or hydrogen ions
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how is drinking water treated to make it safe to drink?
sedimentation or filtering to remove solids and killing microbes (sterilizing) using chlorine or ozone
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what would be the consequences of not adding chlorine and fluoride to tap water?
no chlorine: increased health risks, more spreading of disease. fluorine: more tooth decay poorer dental health
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Other cards in this set

Card 2

Front

whats the difference between sum and scale?

Back

scum if formed when soap reacts with compounds in hard water, scale is produced when temporary hard water is heated or boiled.

Card 3

Front

why is it better to drink hard water rather then soft?

Back

Preview of the front of card 3

Card 4

Front

what is meant by temporary hard water?

Back

Preview of the front of card 4

Card 5

Front

how does ion-exchange resin soften hard water?

Back

Preview of the front of card 5
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