2471717
Beschreibung
Erzeugt von Jamie Caffey
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Erstellt von Jamie Caffey
vor mehr als 11 Jahre
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Frage 1
Frage
Soft water lathers easily with soap
Antworten
- True
- False
Frage 2
Frage
What does hard water produce when it reacts with soap?
Antworten
-
Scale
-
Scum
Frage 3
Frage
What ions does hard water contain?
Antworten
-
Calcium and magnesium
-
Carbon and potassium
Frage 4
Frage
Temporary hard water produces scale when heated
Antworten
- True
- False
Frage 5
Frage
What does scale do?
Antworten
-
Reduce the efficiency of heating systems and cause blockages
-
Evaporate when heated
Frage 6
Frage
How are calcium compounds good for our health?
Antworten
-
Help develop strong bones and teeth. May reduce the risk of heart disease.
-
They do not have any particular health benefits
-
Help with fighting infection
Frage 7
Frage
Permanent hard water is not softened by boiling and does not produce scale when heated
Antworten
- True
- False
Frage 8
Frage
Washing soda is sodium carbonate
Antworten
- True
- False
Frage 9
Frage
How are ions precipitated out of hard water?
Antworten
-
Sodium carbonate reacts with the magnesium and calcium ions in the hard water to form calcium carbonate and magnesium carbonate that will not react with water
-
Filtration
-
Sodium carbonate displaces the magnesium and calcium ions so the hard water turns soft
Frage 10
Frage
Ion exchange columns contain a resin made of sodium and hydrogen ions
Antworten
- True
- False
Frage 11
Frage
How do ion exchange columns work?
Antworten
-
The calcium and magnesium ions attach to the resin and the water no longer contains any ions
-
The hard water is passed through the exchange column. The calcium and magnesium ions become attached to the resin and the sodium and hydrogen ions take their place in the water. These ions do not react with soap
Frage 12
Frage
What methods are used to treat water
Antworten
-
Sedimentation and filtration to remove solids
-
Evaporation and distillation
Frage 13
Frage
Why is chlorine used in the treatment of water
Antworten
-
Because it is a law
-
Because chlorine kills microbes in the water
Frage 14
Frage
What are the issues with using chlorine to treat water?
Antworten
-
It is poisonous and can produce toxic compounds
-
It is very expensive
Frage 15
Frage
Why is fluoride added to water?
Antworten
-
To prevent tooth decay
-
It is added by the government to control the population
-
To help prevent heart disease
Frage 16
Frage
Some people think that you should be able to choose whether or not to have fluoride in your water
Antworten
- True
- False
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