874656
Questão 1
Questão
True or false? Using hard water makes it more difficult for soap to lather.
Responda
- True
- False
Questão 2
Questão
Which of these rocks helps to cause hardness in water?
Responda
-
Gypsum
-
Granite
-
Dolomite
-
Calcite
-
Basalt
Questão 3
Questão
Which type of deposit forms when hard water reacts with soap?
Responda
-
Scale, calcium carbonate
-
Scum, calcium stearate
Questão 4
Questão
Which type of deposit forms when hard water is boiled?
Responda
-
Scale, calcium carbonate
-
Scum, calcium stearate
Questão 5
Questão
True or false? Calcium carbonate dissolves in carbonic acid (rainwater) to produce calcium ions and hydrogencarbonate ions.
Responda
- True
- False
Questão 6
Questão
Which type of hard water can be softened by heating?
Responda
-
Permanent hard water
-
Temporary hard water
Questão 7
Questão
True or false? Scale is formed upon heating temporary hard water because calcium hydrogencarbonate forms a precipitate.
Responda
- True
- False
Questão 8
Questão
Which of these methods can soften either type of hard water?
Responda
-
Washing soda
-
Boiling
-
Ion-exchange column
Questão 9
Questão
Which ion is exchanged with calcium and magnesium ions in an ion-exchange column?
Responda
-
Potassium K+
-
Sodium Na+
-
Cadmium Cd2+
-
Iron Fe3+
Questão 10
Questão
True or false? Ion-exchange columns do not need to be regularly washed out with saline solution.
Responda
- True
- False
Questão 11
Questão
What is the first stage in the water treatment process?
Responda
-
Passing water through a sand filter for clear water
-
Passing water through metal meshes to remove large objects
-
Chlorination of water to kill bacteria
-
Adding aluminium sulphate and lime to encourage flocculation of suspended particles in the water
Questão 12
Questão
What is the second stage in the water treatment process?
Responda
-
Passing water through a sand filter for clear water
-
Passing water through metal meshes to remove large objects
-
Chlorination of water to kill bacteria
-
Adding aluminium sulphate and lime to encourage flocculation of suspended particles in the water
Questão 13
Questão
What is the third stage in the water treatment process?
Responda
-
Passing water through a sand filter for clear water
-
Passing water through metal meshes to remove large objects
-
Chlorination of water to kill bacteria
-
Adding aluminium sulphate and lime to encourage flocculation of suspended particles in the water
Questão 14
Questão
What is the fourth stage in the water treatment process?
Responda
-
Passing water through a sand filter for clear water
-
Passing water through metal meshes to remove large objects
-
Chlorination of water to kill bacteria
-
Adding aluminium sulphate and lime to encourage flocculation of suspended particles in the water
Questão 15
Questão
What is often contained in a filter cartridge?
Responda
-
Activated carbon
-
Activated boron
-
Ion-exchange column
-
Fractionating column
-
Silver
-
Ruthenium
Questão 16
Questão
What are health benefits of drinking hard water?
Responda
-
Reduced risk of heart disease
-
Reduced risk of cancer
-
Stronger muscles
-
Stronger bones and teeth
Questão 17
Questão
Which gas is sometimes used as an alternative to chlorine in killing bacteria?
Responda
-
Fluorine
-
Hydrogen sulphide
-
Ozone
-
Methane
Questão 18
Questão
Which ion is sometimes added to water to reduce the risk of tooth decay?
Responda
-
Sulphate, SO42-
-
Fluoride, F-
-
Nitrate, NO3-
-
Potassium, K+
Questão 19
Questão
Which of these are arguments for the fluoridation of water?
Responda
-
Reduction in tooth decay
-
Increased risk of fluorosis
-
Protects people who don't have good dental hygiene
-
Impossible to set safe limits due to varied intake
-
Ethical issues of being forced to take a treatment
-
Reduced risk of heart disease
Questão 20
Questão
Which of these are arguments against the fluoridation of water?
Responda
-
Reduction in tooth decay
-
Increased risk of fluorosis
-
Protects people who do not have good dental hygiene
-
Impossible to set safe limits due to varied intake
-
Ethical issues with being forced to take a treatment
-
Reduced risk of heart disease
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