Question 1

Which best symbolizes the hydrogen bonding between two water molecules?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)    D

Question 2

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. 
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 3

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

Question 4

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

Question 5

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

Question 6

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

Question 7

Which compound should be the most soluble in water?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 8

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

Question 9

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. 
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 10

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 
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 11

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

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 
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

Which type of water may be considered pure?

Accepted Answer

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

Question 14

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. 
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 15

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

Accepted Answer

A) NO2+ 
B) NO2¯ 
C) NO3¯ 
D) NO3+ 
A) NO2+ 
B) NO2¯ 
C) NO3¯ 
D) NO3+

Question 16

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. 
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 17

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 18

Which of these is not a trihalomethane?

Accepted Answer

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

Question 19

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. 
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 20

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

Which best symbolizes the hydrogen bonding between two water molecules?

Which correctly describes groundwater?

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?

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

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

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.

Which compound should be the most soluble in water?

"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?

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

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

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

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

Which type of water may be considered pure?

Which statement is not true?

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

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

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.

Which of these is not a trihalomethane?

A disadvantage of ozonation over chlorination is

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

The Air We Breathe

Protecting the Ozone Layer

The Chemistry of Global Climate Change

Energy From Combustion

Neutralizing the Threat of Acid Rain

The Fires of Nuclear Fission

Energy From Electron Transfer

The World of Polymers and Plastics

Manipulating Molecules and Designing Drugs

Nutrition: Food for Thought

Genetic Engineering and the Molecules of Life

Filters

Exam 5: Water for Life

Which best symbolizes the hydrogen bonding between two water molecules?

Which correctly describes groundwater?

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?

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

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

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.

Which compound should be the most soluble in water?

"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?

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

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

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

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

Which type of water may be considered pure?

Which statement is not true?

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

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

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.

Which of these is not a trihalomethane?

A disadvantage of ozonation over chlorination is

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

The Air We Breathe

Protecting the Ozone Layer

The Chemistry of Global Climate Change

Energy From Combustion

Neutralizing the Threat of Acid Rain

The Fires of Nuclear Fission

Energy From Electron Transfer

The World of Polymers and Plastics

Manipulating Molecules and Designing Drugs

Nutrition: Food for Thought

Genetic Engineering and the Molecules of Life

Filters

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.

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

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