Question 1

Which of the following has the highest MCL in drinking water in the US?

Accepted Answer

A) Nitrates 
B) Trihalomethanes 
C) Lead 
D) Mercury 
A) Nitrates 
B) Trihalomethanes 
C) Lead 
D) Mercury

Question 2

We cannot effectively clean nonpolar substances from our hands or clothing with water alone;we must add soap or detergent.The structure of a typical soap molecule is shown below.Which region of this molecule would dissolve in a nonpolar substance such as grease?

Accepted Answer

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

Question 3

What is the formula of the ionic compound formed from magnesium,Mg,and chlorine,Cl?

Accepted Answer

A) MgCl 
B) Mg2Cl2 
C) Mg2Cl 
D) MgCl2 
A) MgCl 
B) Mg2Cl2 
C) Mg2Cl 
D) MgCl2

Question 4

Which compound is insoluble in water?

Accepted Answer

A) sodium carbonate 
B) potassium nitrate 
C) ammonium chloride 
D) calcium carbonate 
A) sodium carbonate 
B) potassium nitrate 
C) ammonium chloride 
D) calcium carbonate

Question 5

How many bromide ions will combine with one ion of aluminum?

Accepted Answer

A) 3 
B) 6 
C) 1 
D) 2 
A) 3 
B) 6 
C) 1 
D) 2

Question 6

A 2- ion has 36 electrons and 45 neutrons.What is its correct symbol?

Accepted Answer

A) (83Sr2-) 
B) (71Br2-) 
C) (79Se 2-) 
D) (78As 2-) 
A) (83Sr2-) 
B) (71Br2-) 
C) (79Se 2-) 
D) (78As 2-)

Question 7

Which corresponds to the composition of the ion typically formed by fluorine?

Accepted Answer

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

Question 8

What are the major disadvantages of using ozone instead of chlorine to disinfect water?

Accepted Answer

A) Ozonation is more expensive than chlorination and ozone leaves an odor in the water. 
B) Ozonation causes trihalomethane formation and leaves an odor in the treated water. 
C) Ozonation causes trihalomethane formation and is more expensive than chlorination. 
D) Ozone does not provide long-term protection against waterborne viruses because it decomposes quickly and it is more expensive than chlorination. 
A) Ozonation is more expensive than chlorination and ozone leaves an odor in the water. 
B) Ozonation causes trihalomethane formation and leaves an odor in the treated water. 
C) Ozonation causes trihalomethane formation and is more expensive than chlorination. 
D) Ozone does not provide long-term protection against waterborne viruses because it decomposes quickly and it is more expensive than chlorination.

Question 9

At water treatment plants aluminum sulfate and calcium hydroxide are added to

Accepted Answer

A) neutralize excess ozone. 
B) neutralize excess chlorine. 
C) remove suspended clay and dust particles. 
D) neutralize excess acidity or basicity. 
A) neutralize excess ozone. 
B) neutralize excess chlorine. 
C) remove suspended clay and dust particles. 
D) neutralize excess acidity or basicity.

Question 10

What is the correct name for (NH4)2CO3?

Accepted Answer

A) biammonium carbonate 
B) ammonium bicarbonate 
C) ammonium carboxide 
D) ammonium carbonate 
A) biammonium carbonate 
B) ammonium bicarbonate 
C) ammonium carboxide 
D) ammonium carbonate

Question 11

Which compound has an incorrect formula?

Accepted Answer

A) MgPO4 
B) (NH4)2S 
C) Mg(HSO3)2 
D) NaClO4 
A) MgPO4 
B) (NH4)2S 
C) Mg(HSO3)2 
D) NaClO4

Question 12

Which compounds are not soluble in water at room temperature?

Accepted Answer

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

Question 13

Which is the correct Lewis structure of a chlorine atom and the ion that chlorine forms?

Accepted Answer

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

Question 14

The attractions between anions and cations throughout a crystal are known collectively as

Accepted Answer

A) covalent bonds. 
B) polar covalent bonds. 
C) hydrogen bonds. 
D) ionic bonds. 
A) covalent bonds. 
B) polar covalent bonds. 
C) hydrogen bonds. 
D) ionic bonds.

Question 15

Which is the best definition of specific heat?

Accepted Answer

A) the quantity of heat energy that must be absorbed to cause one gram of a liquid substance to boil 
B) the quantity of heat energy that must be absorbed to increase the temperature of one gram of a substance one degree Celsius 
C) the boiling point of a liquid substance in degrees Celsius 
D) the difference between the freezing point and the boiling point of a substance 
A) the quantity of heat energy that must be absorbed to cause one gram of a liquid substance to boil 
B) the quantity of heat energy that must be absorbed to increase the temperature of one gram of a substance one degree Celsius 
C) the boiling point of a liquid substance in degrees Celsius 
D) the difference between the freezing point and the boiling point of a substance

Question 16

A 0.25 M solution of the sugar sucrose,C12H22O11,in water is tested for conductivity using the type of apparatus shown.What do you predict will happen?

Accepted Answer

A) The bulb will not light up.Sucrose is an electrolyte,but not very soluble in aqueous solution. 
B) The bulb will not light up.Sucrose is in the molecular form in aqueous solution. 
C) The light bulb will shine dimly.Sucrose is only partially ionized in aqueous solution. 
D) The light bulb will shine brightly.Sucrose is highly ionized in aqueous solution. 
A) The bulb will not light up.Sucrose is an electrolyte,but not very soluble in aqueous solution. 
B) The bulb will not light up.Sucrose is in the molecular form in aqueous solution. 
C) The light bulb will shine dimly.Sucrose is only partially ionized in aqueous solution. 
D) The light bulb will shine brightly.Sucrose is highly ionized in aqueous solution.

Question 17

Which of the following is/are true about Maximum Contaminant Level Goals (MCLGs)?
I.The MCLG for any contaminant that is regulated as a carcinogen is set to zero.
II.An average person weighing 70 kg (154 lb)could drink two liters (about two quarts)of water containing a contaminant at the MCGL level every day for 70 years without suffering any ill effects.
III.The Maximum Contaminant Level (MCL)set by the EPA may be higher than the MCLG to account for the financial and technical barriers that may make achieving these goals difficult.
IV.The MCLG for a contaminant is always set to zero because this is the best way to protect human health.

Accepted Answer

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

Question 18

What percentage of Earth's water is in the oceans?

Accepted Answer

A) 97.4% 
B) 50% 
C) 2.59% 
D) 0.014% 
A) 97.4% 
B) 50% 
C) 2.59% 
D) 0.014%

Question 19

Reverse osmosis is illustrated in this diagram.What is this process used for?

Accepted Answer

A) to purify water by ion exchange 
B) to remove dissolved salts from sea water 
C) for the ozonation of water supplies 
D) to add fluorine to municipal water supplies 
A) to purify water by ion exchange 
B) to remove dissolved salts from sea water 
C) for the ozonation of water supplies 
D) to add fluorine to municipal water supplies

Question 20

Which shows the Lewis structure of water with the correct partial charges and nonbonding electrons?

Accepted Answer

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

Which of the following has the highest MCL in drinking water in the US?

We cannot effectively clean nonpolar substances from our hands or clothing with water alone;we must add soap or detergent.The structure of a typical soap molecule is shown below.Which region of this molecule would dissolve in a nonpolar substance such as grease?

What is the formula of the ionic compound formed from magnesium,Mg,and chlorine,Cl?

Which compound is insoluble in water?

How many bromide ions will combine with one ion of aluminum?

A 2- ion has 36 electrons and 45 neutrons.What is its correct symbol?

Which corresponds to the composition of the ion typically formed by fluorine?

What are the major disadvantages of using ozone instead of chlorine to disinfect water?

At water treatment plants aluminum sulfate and calcium hydroxide are added to

What is the correct name for (NH₄)₂CO₃?

Which compound has an incorrect formula?

Which compounds are not soluble in water at room temperature?

Which is the correct Lewis structure of a chlorine atom and the ion that chlorine forms?

The attractions between anions and cations throughout a crystal are known collectively as

Which is the best definition of specific heat?

A 0.25 M solution of the sugar sucrose,C₁₂H₂₂O₁₁,in water is tested for conductivity using the type of apparatus shown.What do you predict will happen?

What percentage of Earth's water is in the oceans?

Reverse osmosis is illustrated in this diagram.What is this process used for?

Which shows the Lewis structure of water with the correct partial charges and nonbonding electrons?

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 of the following has the highest MCL in drinking water in the US?

We cannot effectively clean nonpolar substances from our hands or clothing with water alone;we must add soap or detergent.The structure of a typical soap molecule is shown below.Which region of this molecule would dissolve in a nonpolar substance such as grease?

What is the formula of the ionic compound formed from magnesium,Mg,and chlorine,Cl?

Which compound is insoluble in water?

How many bromide ions will combine with one ion of aluminum?

A 2- ion has 36 electrons and 45 neutrons.What is its correct symbol?

Which corresponds to the composition of the ion typically formed by fluorine?

What are the major disadvantages of using ozone instead of chlorine to disinfect water?

At water treatment plants aluminum sulfate and calcium hydroxide are added to

What is the correct name for (NH4)2CO3?

Which compound has an incorrect formula?

Which compounds are not soluble in water at room temperature?

Which is the correct Lewis structure of a chlorine atom and the ion that chlorine forms?

The attractions between anions and cations throughout a crystal are known collectively as

Which is the best definition of specific heat?

A 0.25 M solution of the sugar sucrose,C12H22O11,in water is tested for conductivity using the type of apparatus shown.What do you predict will happen?

What percentage of Earth's water is in the oceans?

Reverse osmosis is illustrated in this diagram.What is this process used for?

Which shows the Lewis structure of water with the correct partial charges and nonbonding electrons?

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

What is the correct name for (NH₄)₂CO₃?

A 0.25 M solution of the sugar sucrose,C₁₂H₂₂O₁₁,in water is tested for conductivity using the type of apparatus shown.What do you predict will happen?