Impurities in Water Quiz

What is an impurity in the context of water?

• A substance that makes water completely pure

• A substance that is added to a completely pure substance

• A substance that makes water unsafe

• A substance that has no effect on water

How do impurities affect a once-pure substance?

• They have no effect

• They make it completely pure

• They affect how it will react

• They make it always unsafe

Which of the following is NOT necessarily true about impurities in water?

• They are always unsafe

• They can change physical characteristics

• They can change flavor and color

• They can change boiling points

What process is used to make rainwater that enters lakes and rivers safe for drinking?

• Filtration

• Evaporation

• Distillation

• Condensation

What is a contaminant or pollutant in the context of water safety?

• A substance that makes water pure

• A substance that makes water impure or unsafe

• A substance that enhances water taste

• A substance that increases water volume

Which of the following is considered a contaminant or pollutant in water?

• Vitamins

• Human and animal wastes

• Clean sand

• Fresh air

What are examples of physical contaminants mentioned in the text?

• Leaves and twigs

• Cans, bottles, and plastics

• Sand and soil

• Fish and algae

What harm do physical contaminants like garbage cause according to the text?

• They improve water quality

• They provide nutrients to aquatic life

• They harbor bacteria and break down into toxins

• They help in water filtration

What are chemical contaminants?

• Elements or compounds

• Only man-made substances

• Only naturally occurring substances

• Only gases

Which of the following is an example of a chemical contaminant?

• Nitrogen

• Oxygen

• Water

• Carbon dioxide