Water Treatment and Purification Quiz

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Questions and Answers

Which of the following is considered a soluble impurity in natural water?

Plant debris

Sand

Mineral salts (correct)

Silt

All impurities in natural water are harmful and require purification.

False

What is one reason purification of natural water is necessary?

To remove harmful impurities and microorganisms.

___ and microorganisms are present in natural water and can be harmful to health.

Impurities Signup and view all the answers

Match the following impurities in natural water with their classification:

Mineral salts = Soluble Sand = Insoluble Plant debris = Insoluble Signup and view all the answers

Which method of disinfection does not leave a bad smell in treated water?

Ozone Signup and view all the answers

Chlorination can cause eye and skin irritation if too much chlorine is present in the water.

True Signup and view all the answers

What is the primary purpose of using ultraviolet light in water treatment?

To kill microorganisms Signup and view all the answers

Ozone can cause __________ and shortness of breath when inhaled.

chest pain Signup and view all the answers

Match the disinfection method with its characteristic effect:

Chlorination = Irritating smell Ozone = No bad smell Ultraviolet light = Used in water dispensers Chlorination and Ozone = Sterilizes water Signup and view all the answers

Which step in the water treatment process helps remove large objects from the water?

Filtration through screens Signup and view all the answers

Chlorine is added to water primarily to enhance its flavor.

False Signup and view all the answers

What substance is added during the water treatment process to help prevent tooth decay?

Fluoride Signup and view all the answers

Wastewater must be treated to remove harmful substances before it is discharged into the ______.

seas Signup and view all the answers

Match the following causes of water pollution with their descriptions:

Discharging wastewater = Direct release into water bodies Littering = Incorrect disposal of waste materials Oil spills = Accidental release of oil into water Agricultural runoff = Pesticides and fertilizers entering water systems Signup and view all the answers

What effect can swimming in polluted water have?

Skin and eye diseases Signup and view all the answers

Eating seafood from contaminated water can lead to diseases like cholera.

True Signup and view all the answers

Name one common source of water pollution.

Waste water Signup and view all the answers

Algal blooms can cause a depletion of ______ in water, affecting aquatic life.

oxygen Signup and view all the answers

Match the pollutants with their harmful effects:

Waste water = Contains harmful microorganisms Detergents and Fertilizers = Promote algae growth Algae = Can deplete oxygen in water Polluted seafood = Can cause disease in humans Signup and view all the answers

What is the purpose of adding alum during the sedimentation process?

To help remove fine suspended solid impurities Signup and view all the answers

In filtration, only substances that are larger than the filter pores can pass through.

False Signup and view all the answers

What is the term for the liquid that passes through the filter during the filtration process?

filtrate Signup and view all the answers

During sedimentation, impurities in the water sink to the bottom and form a layer of ______.

sediment Signup and view all the answers

Match the materials used in a filter with their descriptions:

Fine sand = Used for filtering small particles Coarse sand = Used for initial filtration of larger particles Cotton wool = Used for fine filtration Rock chips = Used to provide structural support in the filter Signup and view all the answers

What is the main benefit of fluoridation?

It strengthens tooth enamel Signup and view all the answers

Fluoridation is only beneficial for children.

False Signup and view all the answers

What are the two sources of drinking water in Hong Kong?

Rainwater and impounding reservoirs from the Dongjiang Signup and view all the answers

The process of adding fluoride to drinking water is known as __________.

fluoridation Signup and view all the answers

Match the following steps of water treatment with their functions:

Sedimentation = Removes larger particles from water Fluoridation = Strengthens tooth enamel Filtration = Cleans the water by removing smaller particles Adding chlorine = Kills bacteria and other pathogens Signup and view all the answers

Which water purification method is effective in removing microorganisms?

Distillation Signup and view all the answers

Chlorination is a process that involves adding ozone to water.

False Signup and view all the answers

Which method of water purification involves allowing suspended particles to settle?

Sedimentation Signup and view all the answers

What is the purpose of adding fluoride to water?

To prevent tooth decay Signup and view all the answers

In water purification, the process that allows heavy insoluble impurities to settle at the bottom is called ______.

sedimentation Signup and view all the answers

Adding ozone to water is a method of purification that does not kill microorganisms.

False Signup and view all the answers

Match the following water purification methods with their description:

Sedimentation = Impurities sink to the bottom Filtration = Residue remains on the filter paper Distillation = Converting water to steam and back Chlorination = Adding chlorine to kill microorganisms Signup and view all the answers

What is the purpose of chlorination in water purification?

To kill microorganisms. Signup and view all the answers

The process of __________ involves separating water from impurities by heating and condensing.

distillation Signup and view all the answers

Match the following water purification methods with their appropriate descriptions:

Sedimentation = Allows suspended particles to settle Filtration = Passes water through a filter to remove impurities UV light = Uses ultraviolet light to kill microorganisms Fluoridation = Adds fluoride to help prevent tooth decay Signup and view all the answers

What is one major consequence of oil spills in water bodies?

They block sunlight reaching underwater plants. Signup and view all the answers

Chemicals from factories can be toxic and harmful if ingested.

True Signup and view all the answers

What is one action individuals can take to control water pollution?

Not throwing rubbish into rivers. Signup and view all the answers

Plastics break down into __________, which can harm marine life.

microplastics Signup and view all the answers

Match the type of waste with its impact on water ecosystems:

Solid Waste = Can cause animal deaths by ingestion or entrapment Oil = Blocks oxygen and affects sea animals' ability to hunt Chemicals = Can be toxic and harmful to living beings Plastic = Breaks down into microplastics that obstruct digestion Signup and view all the answers

What is the main purpose of distillation in purifying sea water?

To remove soluble and insoluble impurities from water Signup and view all the answers

The distillation process includes boiling the water to convert it into steam.

True Signup and view all the answers

What is the term for the pure water collected after the distillation process?

distillate Signup and view all the answers

During distillation, only ______ turns into steam while impurities remain in the round-bottom flask.

water Signup and view all the answers

Match the following components of a distillation apparatus with their functions:

Round-bottom flask = Heats the sea water Condenser = Cools steam to convert it back to liquid Thermometer = Measures the temperature of the water Distillate outlet = Collects the final purified water Signup and view all the answers

Study Notes

Identifying Impurities in Water

Natural water contains various impurities, some are soluble and some are insoluble
Examples of soluble impurities include mineral salts
Examples of insoluble impurities include sand, plant debris

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Description

Test your knowledge on the key concepts of water treatment and purification. This quiz covers the classification of impurities in natural water, disinfection methods, and the importance of water purification for health. Dive into questions about chlorine, ultraviolet light, and other disinfection techniques.

Water Treatment and Purification Quiz

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Questions and Answers

Which of the following is considered a soluble impurity in natural water?

All impurities in natural water are harmful and require purification.

What is one reason purification of natural water is necessary?

___ and microorganisms are present in natural water and can be harmful to health.

Match the following impurities in natural water with their classification:

Which method of disinfection does not leave a bad smell in treated water?

Chlorination can cause eye and skin irritation if too much chlorine is present in the water.

What is the primary purpose of using ultraviolet light in water treatment?

Ozone can cause __________ and shortness of breath when inhaled.

Match the disinfection method with its characteristic effect:

Which step in the water treatment process helps remove large objects from the water?

Chlorine is added to water primarily to enhance its flavor.

What substance is added during the water treatment process to help prevent tooth decay?

Wastewater must be treated to remove harmful substances before it is discharged into the ______.

Match the following causes of water pollution with their descriptions:

What effect can swimming in polluted water have?

Eating seafood from contaminated water can lead to diseases like cholera.

Name one common source of water pollution.

Algal blooms can cause a depletion of ______ in water, affecting aquatic life.

Match the pollutants with their harmful effects:

What is the purpose of adding alum during the sedimentation process?

In filtration, only substances that are larger than the filter pores can pass through.

What is the term for the liquid that passes through the filter during the filtration process?

During sedimentation, impurities in the water sink to the bottom and form a layer of ______.

Match the materials used in a filter with their descriptions:

What is the main benefit of fluoridation?

Fluoridation is only beneficial for children.

What are the two sources of drinking water in Hong Kong?

The process of adding fluoride to drinking water is known as __________.

Match the following steps of water treatment with their functions:

Which water purification method is effective in removing microorganisms?

Chlorination is a process that involves adding ozone to water.

Which method of water purification involves allowing suspended particles to settle?

What is the purpose of adding fluoride to water?

In water purification, the process that allows heavy insoluble impurities to settle at the bottom is called ______.

Adding ozone to water is a method of purification that does not kill microorganisms.

Match the following water purification methods with their description:

What is the purpose of chlorination in water purification?

The process of __________ involves separating water from impurities by heating and condensing.

Match the following water purification methods with their appropriate descriptions:

What is one major consequence of oil spills in water bodies?

Chemicals from factories can be toxic and harmful if ingested.

What is one action individuals can take to control water pollution?

Plastics break down into __________, which can harm marine life.

Match the type of waste with its impact on water ecosystems:

What is the main purpose of distillation in purifying sea water?

The distillation process includes boiling the water to convert it into steam.

What is the term for the pure water collected after the distillation process?

During distillation, only ______ turns into steam while impurities remain in the round-bottom flask.

Match the following components of a distillation apparatus with their functions:

Study Notes

Identifying Impurities in Water

Studying That Suits You

Description

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