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