

Understanding Water Hardness Concepts
Interactive Video
•
Science, Chemistry, Biology
•
9th - 10th Grade
•
Practice Problem
•
Hard
Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary factor that differentiates hard water from soft water?
Temperature
Mineral content
pH level
Color
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does water become 'hard'?
By being stored in plastic containers
By being frozen
By flowing through areas with high mineral content
By being exposed to sunlight
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the classification of water with less than 61 mg of calcium carbonate per liter?
Distilled water
Moderately hard water
Soft water
Very hard water
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it difficult to get a good lather with soap in hard water?
Soap evaporates
Soap reacts with minerals to form insoluble compounds
Soap dissolves too quickly
Soap becomes too slippery
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is limescale and how is it formed?
A chemical used to soften water
A type of algae found in water
A mineral deposit formed when hard water is heated or evaporates
A type of soap residue formed in soft water
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is one method to soften water at home?
Using a UV filter
Adding sugar
Boiling the water
Freezing the water
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is 'permanent hardness' in water?
Hardness that changes with temperature
Hardness that can be removed by boiling
Hardness that is temporary
Hardness caused by calcium sulfate that cannot be removed by boiling
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