Question 1

Aeration of drinking water

Accepted Answer

A) removes odors. 
B) increases dissolved air. 
C) improves flavor. 
D) does all of the above. 
A) removes odors. 
B) increases dissolved air. 
C) improves flavor. 
D) does all of the above.

Question 2

Algae bloom can be stimulated on a lake or pond by

Accepted Answer

A) runoff of fertilizers from crops and lawns. 
B) fishing. 
C) acid rain. 
D) basic rain. 
A) runoff of fertilizers from crops and lawns. 
B) fishing. 
C) acid rain. 
D) basic rain.

Question 3

Which of the following is considered to be a disadvantage of fluoridating drinking water?

Accepted Answer

A) The concentration of fluoride in drinking water is usually 0.7-1.0 ppm. 
B) Some hydroxide ions in tooth enamel are replaced by fluoride ions. 
C) High fluoride consumption in early childhood can cause mottling of the teeth. 
D) Treatment with fluoride results in harder tooth enamel. 
A) The concentration of fluoride in drinking water is usually 0.7-1.0 ppm. 
B) Some hydroxide ions in tooth enamel are replaced by fluoride ions. 
C) High fluoride consumption in early childhood can cause mottling of the teeth. 
D) Treatment with fluoride results in harder tooth enamel.

Question 4

What percentage of water on the earth is seawater,and hence,unfit for drinking?

Accepted Answer

A) 2% 
B) 25% 
C) 45% 
D) 98% 
A) 2% 
B) 25% 
C) 45% 
D) 98%

Question 5

A stagnant pond has an odor like ammonia.This is a good indication that the BOD of the pond is ________ and that the DO is ________.

Accepted Answer

The answer of A stagnant pond has an odor like...

Question 6

Many communities are beginning to use sludge on farm fields.What is the biggest problem with using sludge on fields?

Accepted Answer

A) The sludge must be dried before it can be applied to the fields. 
B) Wet sludge may irrigate the crops. 
C) Sludge is often contaminated with toxic metals that could be taken up by plants. 
D) Sludge is a source of nutrients and humus. 
A) The sludge must be dried before it can be applied to the fields. 
B) Wet sludge may irrigate the crops. 
C) Sludge is often contaminated with toxic metals that could be taken up by plants. 
D) Sludge is a source of nutrients and humus.

Question 7

All of the following atoms are found in the framework of naturally occurring zeolites EXCEPT

Accepted Answer

A) aluminum. 
B) neon. 
C) oxygen. 
D) silicon. 
A) aluminum. 
B) neon. 
C) oxygen. 
D) silicon.

Question 8

Soft water contains relatively large concentrations of

Accepted Answer

A) iron ions. 
B) magnesium ions. 
C) potassium ions. 
D) calcium ions. 
A) iron ions. 
B) magnesium ions. 
C) potassium ions. 
D) calcium ions.

Question 9

Fluorides are added to water to

Accepted Answer

A) kill viruses. 
B) remove nitrites. 
C) neutralize bases. 
D) prevent tooth decay. 
A) kill viruses. 
B) remove nitrites. 
C) neutralize bases. 
D) prevent tooth decay.

Question 10

The principal cations in hard water are sodium and potassium ions.

Accepted Answer

A) True 
 B)False

Question 11

Acid rain results in the release of more magnesium ions from soil.

Accepted Answer

A) True 
 B)False

Question 12

The saltiness of the oceans is

Accepted Answer

A) decreasing slowly. 
B) increasing slowly. 
C) increasing rapidly. 
D) constant. 
A) decreasing slowly. 
B) increasing slowly. 
C) increasing rapidly. 
D) constant.

Question 13

Lakes and streams with granite rock bottoms are more susceptible to

Accepted Answer

A) high levels of BOD. 
B) anaerobic organisms. 
C) acidification. 
D) low DO. 
A) high levels of BOD. 
B) anaerobic organisms. 
C) acidification. 
D) low DO.

Question 14

Pathogenic is

Accepted Answer

A) disease-causing. 
B) an antibiotic. 
C) a cure for a disease. 
D) a virus. 
A) disease-causing. 
B) an antibiotic. 
C) a cure for a disease. 
D) a virus.

Question 15

The water cycle acts to purify water by

Accepted Answer

A) evaporation and condensation. 
B) crystallization (freeze-thaw cycle). 
C) filtration. 
D) All of these act to purify water. 
A) evaporation and condensation. 
B) crystallization (freeze-thaw cycle). 
C) filtration. 
D) All of these act to purify water.

Question 16

The EPA drinking water standard for arsenic is 0.050 mg/L.What is this concentration in ppb?

Accepted Answer

A) 0)050 
B) 5)0 
C) 50. 
D) 5)0 × 10³ 
A) 0)050 
B) 5)0 
C) 50. 
D) 5)0 × 10³

Question 17

Contaminated water supplies and lack of adequate sanitation kill approximately ________ people worldwide each year.

Accepted Answer

A) 3,600,000 
B) 100,000 
C) 1,000,000 
D) 500,000 
A) 3,600,000 
B) 100,000 
C) 1,000,000 
D) 500,000

Question 18

Volatile organic compounds (VOC)make up one category of contaminants in groundwater.Which one of the following is NOT a VOC?

Accepted Answer

A) mica 
B) chloroform 
C) toluene 
D) benzene 
A) mica 
B) chloroform 
C) toluene 
D) benzene

Question 19

The density of ice is greater than the density of liquid water.

Accepted Answer

A) True 
 B)False

Question 20

Heat of vaporization is the amount of heat required to

Accepted Answer

A) evaporate a liquid. 
B) condense a vapor. 
C) melt a solid. 
D) evaporate a solid. 
A) evaporate a liquid. 
B) condense a vapor. 
C) melt a solid. 
D) evaporate a solid.

Exam 14: Water

Aeration of drinking water

Algae bloom can be stimulated on a lake or pond by

Which of the following is considered to be a disadvantage of fluoridating drinking water?

What percentage of water on the earth is seawater,and hence,unfit for drinking?

A stagnant pond has an odor like ammonia.This is a good indication that the BOD of the pond is ________ and that the DO is ________.

Many communities are beginning to use sludge on farm fields.What is the biggest problem with using sludge on fields?

All of the following atoms are found in the framework of naturally occurring zeolites EXCEPT

Soft water contains relatively large concentrations of

Fluorides are added to water to

The principal cations in hard water are sodium and potassium ions.

Acid rain results in the release of more magnesium ions from soil.

The saltiness of the oceans is

Lakes and streams with granite rock bottoms are more susceptible to

Pathogenic is

The water cycle acts to purify water by

The EPA drinking water standard for arsenic is 0.050 mg/L.What is this concentration in ppb?

Contaminated water supplies and lack of adequate sanitation kill approximately ________ people worldwide each year.

Volatile organic compounds (VOC)make up one category of contaminants in groundwater.Which one of the following is NOT a VOC?

The density of ice is greater than the density of liquid water.

Heat of vaporization is the amount of heat required to

Chemistry

Atoms

Atomic Structure

Chemical Bonds

Chemical Accounting

Gases, Liquids, Solids, and Intermolecular Forces

Acids and Bases

Oxidation and Reduction

Organic Chemistry

Polymers

Nuclear Chemistry

Chemistry of the Earth

Air

Energy

Biochemistry

Food

Drugs

Fitness and Health

Chemistry Down on the Farm

Household Chemicals

Poisons

Filters

A stagnant pond has an odor like ammonia.This is a good indication that the BOD of the pond is and that the DO is .