Question 1

How many moles of sodium chloride are there in 250 mL of a 1.20 M sodium chloride solution?

Accepted Answer

A)  0.30
B)  0.60
C)  1.2
D)  2.4

Question 2

Which type of water may be considered pure?

Accepted Answer

A)  bottled water
B)  filtered water
C)  distilled water
D)  chlorinated water

Question 3

"Hard" water in parts of the Midwest may have a calcium ion concentration as high as 400 ppm.What is this calcium ion concentration when expressed as a percentage?

Accepted Answer

A)  40%
B)  4%
C)  0.4%
D)  0.04%

Question 4

The numbers 1 through 4 are used to identify four different elements on the periodic table.Which element is expected to have 2+ charge when it forms an ion?

Accepted Answer

A)  1
B)  2
C)  3
D)  4 A

Question 5

Which correctly describes groundwater?

Accepted Answer

A)  any water found above ground in lakes and rivers;usually needs treatment to remove harmful contaminants
B)  any water found above ground in lakes and rivers;usually free of harmful contaminants
C)  any water taken from aquifers
D)  none of the above. C

Question 6

The drawing shows a simple way of purifying salt water.What is this process called?

Accepted Answer

A)  filtration
B)  distillation
C)  ozonation
D)  chlorination

Question 7

Which is not a consequence of hydrogen bonding between water molecules?

Accepted Answer

A)  Water has a high boiling point.
B)  Ice floats on water.
C)  Water has a high specific heat.
D)  Water is colorless and odorless.

Question 8

Which compound should be the most soluble in water?

Accepted Answer

A)   
B)   
C)   
D)

Question 9

Water has one of the highest specific heats of any known liquid.This means that the temperature of a water sample _____ with the input of a _____ amount of energy.

Accepted Answer

A)  decreases greatly;small
B)  decreases only slightly;large
C)  increases only slightly;large
D)  increases greatly;small

Question 10

A 4-L sample of water contains 80 µg of lead.What is this lead concentration,in parts per billion (ppb) ?

Accepted Answer

A)  20
B)  80
C)  320
D)  500

Question 11

Which is the correct formula (including charge) of a nitrate ion?

Accepted Answer

A)  NO2+
B)  NO2¯
C)  NO3¯
D)  NO3+

Question 12

Which ions,if present in drinking water,would pose a significant health risk?
i.Pb2+
II.Hg2+
III.Cd2+
IV.Ca2+

Accepted Answer

A)  I,II,and III only
B)  II,III,and IV only
C)  I,III,and IV only
D)  I,II,III,and IV

Question 13

In general,hydrogen bonds are ____ and _____ typical covalent bonds.

Accepted Answer

A)  longer than;about one tenth as strong as
B)  shorter than;about one tenth as strong as
C)  longer than;about ten times as strong as
D)  shorter than;about ten times as strong as

Question 14

Why is water a liquid a room temperature instead of a gas?

Accepted Answer

A)  It is a gas a room temperature.
B)  Water has hydrogen bonds between the molecules.
C)  Water is very acidic.
D)  Water is a good solvent.

Question 15

A disadvantage of ozonation over chlorination is

Accepted Answer

A)  the higher cost of ozonation.
B)  ozonation does not protect the water after the initial process is complete.
C)  the higher cost of ozonation and ozonation does not protect the water after the initial process is complete.
D)  None of these choices is correct.

Question 16

Which statement is not true?

Accepted Answer

A)  In forming a solution,the solute dissolves other substances that are called solvents.
B)  Water is the solvent in an aqueous solution.
C)  Pure water does not conduct electricity.
D)  Electrolytes dissolved in water produce a solution that can conduct electricity.

Question 17

Which of these is not a trihalomethane?

Accepted Answer

A)  CHCl3
B)  CH3Cl
C)  CHF3
D)  CHBr2Cl

Question 18

The MCL for drinking water is the legal limit for the concentration of a contaminant expressed in ppm or ppb.This is always a lower concentration than the MCLG value for the same contaminant.

Accepted Answer

A) True 
 B)False

Question 19

Mixing which of the following will produce a precipitation reaction (give an insoluble product) ?

Accepted Answer

A)  HNO3 (aq) and Sr(OH) 2(aq) 
B)  LiNO3 and NaI
C)  Na2SO4(aq) and Ba(OH) 2(aq) 
D)  NaOH and KBr

Question 20

Which best symbolizes the hydrogen bonding between two water molecules?

Accepted Answer

A)   
B)   
C)   
D)    D

Exam 5: Water for Life

How many moles of sodium chloride are there in 250 mL of a 1.20 M sodium chloride solution?

Correct AnswerverifiedShow Answer

Which type of water may be considered pure?

Correct AnswerverifiedShow Answer

"Hard" water in parts of the Midwest may have a calcium ion concentration as high as 400 ppm.What is this calcium ion concentration when expressed as a percentage?

Correct AnswerverifiedShow Answer

The numbers 1 through 4 are used to identify four different elements on the periodic table.Which element is expected to have 2+ charge when it forms an ion?

Correct AnswerverifiedA

Which correctly describes groundwater?

Correct AnswerverifiedC

The drawing shows a simple way of purifying salt water.What is this process called?

Correct AnswerverifiedShow Answer

Which is not a consequence of hydrogen bonding between water molecules?

Correct AnswerverifiedShow Answer

Which compound should be the most soluble in water?

Correct AnswerverifiedShow Answer

Water has one of the highest specific heats of any known liquid.This means that the temperature of a water sample _____ with the input of a _____ amount of energy.

Correct AnswerverifiedShow Answer

A 4-L sample of water contains 80 µg of lead.What is this lead concentration,in parts per billion (ppb) ?

Correct AnswerverifiedShow Answer

Which is the correct formula (including charge) of a nitrate ion?

Correct AnswerverifiedShow Answer

Which ions,if present in drinking water,would pose a significant health risk? i.Pb2+ II.Hg2+ III.Cd2+ IV.Ca2+

Correct AnswerverifiedShow Answer

In general,hydrogen bonds are ____ and _____ typical covalent bonds.

Correct AnswerverifiedShow Answer

Why is water a liquid a room temperature instead of a gas?

Correct AnswerverifiedShow Answer

A disadvantage of ozonation over chlorination is

Correct AnswerverifiedShow Answer

Which statement is not true?

Correct AnswerverifiedShow Answer

Which of these is not a trihalomethane?

Correct AnswerverifiedShow Answer

The MCL for drinking water is the legal limit for the concentration of a contaminant expressed in ppm or ppb.This is always a lower concentration than the MCLG value for the same contaminant.

Correct AnswerverifiedShow Answer

Mixing which of the following will produce a precipitation reaction (give an insoluble product) ?

Correct AnswerverifiedShow Answer

Which best symbolizes the hydrogen bonding between two water molecules?

Correct AnswerverifiedD

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Water has one of the highest specific heats of any known liquid.This means that the temperature of a water sample _ with the input of a _ amount of energy.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which ions,if present in drinking water,would pose a significant health risk? i.Pb²⁺II.Hg²⁺III.Cd²⁺IV.Ca²⁺

Correct Answer
verified

In general,hydrogen bonds are and _ typical covalent bonds.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D