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20 Questions

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Exploring the States of Water

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Questions and Answers

Which physical state of water is represented by the symbol 'H2O' in the text?

Solid state

Liquid state (correct)

Vapour state

All of the above

What is the process called when water changes from a solid state to a liquid state?

Condensation

Freezing

Melting (correct)

Evaporation

At what temperature does water boil?

The text does not provide this information.

0°C

4°C

100°C (correct)

What is the energy change when water changes from a liquid state to a gas state?

Energy is absorbed Signup and view all the answers

What is the process called when water changes from a gas state to a liquid state?

Condensation Signup and view all the answers

What are the two factors that affect the rate of evaporation of water?

Surface area and humidity Signup and view all the answers

What happens to water vapor when it cools down?

It condenses Signup and view all the answers

How are clouds transported to other places?

By wind Signup and view all the answers

What factors affect the rate of dissolving of a solute in water?

Stirring, temperature, and size of solute Signup and view all the answers

What is the solvent in a solution?

Water Signup and view all the answers

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. Signup and view all the answers

What happens to the solubility of a substance in water as the temperature increases?

The solubility decreases. Signup and view all the answers

Why is it important to remove impurities and microorganisms from natural water before consumption?

Impurities and microorganisms can harm our health. Signup and view all the answers

Which of the following methods can be used to remove insoluble impurities from water?

Sedimentation Signup and view all the answers

What can chlorine, ozone, and ultraviolet light be used for in water treatment?

To kill microorganisms Signup and view all the answers

What is the purpose of adding fluoride to drinking water?

To prevent tooth decay Signup and view all the answers

Which of the following is part of the water treatment process in Hong Kong?

Sedimentation, filtration, and chlorination Signup and view all the answers

What are the potential health risks associated with eating seafood from waters polluted with harmful microorganisms?

All of the above Signup and view all the answers

What can happen during a red tide?

The algae produce toxins Signup and view all the answers

What are the potential health risks associated with eating contaminated seafood?

Build-up of chemicals in the body Signup and view all the answers