20 Questions
Which physical state of water is represented by the symbol 'H2O' in the text?
Liquid state
What is the process called when water changes from a solid state to a liquid state?
Melting
At what temperature does water boil?
100°C
What is the energy change when water changes from a liquid state to a gas state?
Energy is absorbed
What is the process called when water changes from a gas state to a liquid state?
Condensation
What are the two factors that affect the rate of evaporation of water?
Surface area and humidity
What happens to water vapor when it cools down?
It condenses
How are clouds transported to other places?
By wind
What factors affect the rate of dissolving of a solute in water?
Stirring, temperature, and size of solute
What is the solvent in a solution?
Water
Which of the following statements about solubility is true?
Solubility refers to the amount of a substance that can be dissolved in water at any temperature.
What happens to the solubility of a substance in water as the temperature increases?
The solubility decreases.
Why is it important to remove impurities and microorganisms from natural water before consumption?
Impurities and microorganisms can harm our health.
Which of the following methods can be used to remove insoluble impurities from water?
Sedimentation
What can chlorine, ozone, and ultraviolet light be used for in water treatment?
To kill microorganisms
What is the purpose of adding fluoride to drinking water?
To prevent tooth decay
Which of the following is part of the water treatment process in Hong Kong?
Sedimentation, filtration, and chlorination
What are the potential health risks associated with eating seafood from waters polluted with harmful microorganisms?
All of the above
What can happen during a red tide?
The algae produce toxins
What are the potential health risks associated with eating contaminated seafood?
Build-up of chemicals in the body
Test your knowledge of the three states of water and the changes that occur between them with this quiz. Learn about melting, freezing, boiling, and more as you answer questions on the physical properties and processes of water.
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