Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

Water commonly exists in large amounts in which of the following physical states?

Accepted Answer

A)   gaseous
B)   liquid
C)   solid
D)   Water exists in large amounts in all of the above.

Question 3

What percentage of public water supplies in the United States do NOT meet one or more of the EPA water standards?

Accepted Answer

A)   1 %
B)   25 %
C)   10 %
D)   70 %

Question 4

The volume of water increases as it freezes.

Accepted Answer

A) True 
 B)False

Question 5

Aerobic decomposition of organic matter requires

Accepted Answer

A)   oxygen.
B)   nitrogen.
C)   magnesium.
D)   water.

Question 6

It is estimated that approximately ________ people in the world do not have an adequate supply of fresh water and ________ live without basic sanitation.

Accepted Answer

875 millio...

Question 7

All of the following statements are true of hard water EXCEPT

Accepted Answer

A)   it contains calcium salts.
B)   it contains iron salts.
C)   it contains only Na+ and K+ ions.
D)   it forms an insoluble scum with soap.

Question 8

The heat capacity of water is ________ (greater/less) than that of ethanol.

Accepted Answer

The answer of The heat capacity of water is ________...

Question 9

The saltiness of the oceans is

Accepted Answer

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

Question 10

Which of these common human activities contribute to BOD?

Accepted Answer

A)   dumping detergents in a lake or pond
B)   swimming in a lake or pond
C)   paddling a boat across a lake or pond
D)   fishing in a lake or pond

Question 11

A volatile organic compound that is widely used as a dry-cleaning solvent and degreasing compound and is now found in trace amounts in groundwater is

Accepted Answer

A)   methane.
B)   benzene.
C)   formic acid.
D)   trichloroethylene.

Question 12

Secondary treatment of wastewater is not effective for removal of

Accepted Answer

A)   suspended matter.
B)   dissolved organics.
C)   nitrates and phosphates.
D)   bacteria.

Question 13

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.

Question 14

Anaerobic degradation of organic material in water systems occurs in the absence of

Accepted Answer

A)   dissolved oxygen.
B)   dissolved nitrogen.
C)   nutrients.
D)   sunlight.

Question 15

Once groundwater is contaminated, it is very difficult to purify. Discuss this problem of groundwater sources of water with respect to the water cycle.

Accepted Answer

Groundwater contamination is a serious p...

Question 16

Nitrates contaminate many wells in agricultural areas. Why?

Accepted Answer

Nitrates contaminate many wells in agric...

Question 17

Acid rain is a major problem for lakes with a limestone bedrock.

Accepted Answer

A) True 
 B)False

Question 18

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.

Question 19

To use clean water is to abuse it. Each of us can do our share by ________ water and ________ our use of products that require vast amounts of water to make.

Accepted Answer

conserving...

Question 20

Approximately what fraction of the earth's surface is covered with water?

Accepted Answer

A)   50%
B)   95%
C)   75%
D)   15%

Exam 14: Water

The heat capacity of water is ________ (greater/less) than that of ethanol.

Correct AnswerverifiedShow Answer

Secondary treatment of wastewater is not effective for removal of

Correct AnswerverifiedShow Answer

Once groundwater is contaminated, it is very difficult to purify. Discuss this problem of groundwater sources of water with respect to the water cycle.

Correct AnswerAnswered by ExamLex AIGroundwater contamination is a serious p...View AnswerShow Answer

Algae bloom can be stimulated on a lake or pond by

Correct AnswerverifiedShow Answer

A volatile organic compound that is widely used as a dry-cleaning solvent and degreasing compound and is now found in trace amounts in groundwater is

Correct AnswerverifiedShow Answer

To use clean water is to abuse it. Each of us can do our share by ________ water and ________ our use of products that require vast amounts of water to make.

Correct Answerverifiedconserving...View AnswerShow Answer

Anaerobic degradation of organic material in water systems occurs in the absence of

Correct AnswerverifiedShow Answer

Aerobic decomposition of organic matter requires

Correct AnswerverifiedShow Answer

What percentage of public water supplies in the United States do NOT meet one or more of the EPA water standards?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

All of the following statements are true of hard water EXCEPT

Correct AnswerverifiedShow Answer

Nitrates contaminate many wells in agricultural areas. Why?

Correct AnswerAnswered by ExamLex AINitrates contaminate many wells in agric...View AnswerShow Answer

Acid rain is a major problem for lakes with a limestone bedrock.

Correct AnswerverifiedShow Answer

Lakes and streams with granite rock bottoms are more susceptible to

Correct AnswerverifiedShow Answer

Approximately what fraction of the earth's surface is covered with water?

Correct AnswerverifiedShow Answer

The volume of water increases as it freezes.

Correct AnswerverifiedShow Answer

Water commonly exists in large amounts in which of the following physical states?

Correct AnswerverifiedShow Answer

Which of these common human activities contribute to BOD?

Correct AnswerverifiedShow Answer

It is estimated that approximately ________ people in the world do not have an adequate supply of fresh water and ________ live without basic sanitation.

Correct Answerverified875 millio...View AnswerShow Answer

The saltiness of the oceans is

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
Groundwater contamination is a serious p...
View Answer

Correct Answer
verified

Correct Answer
verified

To use clean water is to abuse it. Each of us can do our share by water and our use of products that require vast amounts of water to make.

Correct Answer
verified
conserving...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
Nitrates contaminate many wells in agric...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

It is estimated that approximately people in the world do not have an adequate supply of fresh water and live without basic sanitation.

Correct Answer
verified
875 millio...
View Answer

Correct Answer
verified