2471717
Descrição
Criado por Jamie Caffey
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Criado por Jamie Caffey
mais de 11 anos atrás
|
|
Questão 1
Questão
Soft water lathers easily with soap
Responda
- True
- False
Questão 2
Questão
What does hard water produce when it reacts with soap?
Responda
-
Scale
-
Scum
Questão 3
Questão
What ions does hard water contain?
Responda
-
Calcium and magnesium
-
Carbon and potassium
Questão 4
Questão
Temporary hard water produces scale when heated
Responda
- True
- False
Questão 5
Questão
What does scale do?
Responda
-
Reduce the efficiency of heating systems and cause blockages
-
Evaporate when heated
Questão 6
Questão
How are calcium compounds good for our health?
Responda
-
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
Questão 7
Questão
Permanent hard water is not softened by boiling and does not produce scale when heated
Responda
- True
- False
Questão 8
Questão
Washing soda is sodium carbonate
Responda
- True
- False
Questão 9
Questão
How are ions precipitated out of hard water?
Responda
-
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
Questão 10
Questão
Ion exchange columns contain a resin made of sodium and hydrogen ions
Responda
- True
- False
Questão 11
Questão
How do ion exchange columns work?
Responda
-
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
Questão 12
Questão
What methods are used to treat water
Responda
-
Sedimentation and filtration to remove solids
-
Evaporation and distillation
Questão 13
Questão
Why is chlorine used in the treatment of water
Responda
-
Because it is a law
-
Because chlorine kills microbes in the water
Questão 14
Questão
What are the issues with using chlorine to treat water?
Responda
-
It is poisonous and can produce toxic compounds
-
It is very expensive
Questão 15
Questão
Why is fluoride added to water?
Responda
-
To prevent tooth decay
-
It is added by the government to control the population
-
To help prevent heart disease
Questão 16
Questão
Some people think that you should be able to choose whether or not to have fluoride in your water
Responda
- True
- False
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