Question 1

Which compound has a correct formula?

Accepted Answer

A) CaSO3 
B) Ca2SO4 
C) Mg(CO3)2 
D) Na2PO4 
A) CaSO3 
B) Ca2SO4 
C) Mg(CO3)2 
D) Na2PO4

Question 2

The fact that carbon (C)is less electronegative than nitrogen (N)means that in a C N bond,the

Accepted Answer

A) shared electrons are closer to the C atom than to the N atom. 
B) shared electrons are closer to the N atom than to the C atom. 
C) C atom takes the electrons from the N atom forming C¯ and N+. 
D) N atom takes the electrons from the C atom forming C+ and N¯. 
A) shared electrons are closer to the C atom than to the N atom. 
B) shared electrons are closer to the N atom than to the C atom. 
C) C atom takes the electrons from the N atom forming C¯ and N+. 
D) N atom takes the electrons from the C atom forming C+ and N¯.

Question 3

In general,hydrogen bonds are

Accepted Answer

A) about ten times stronger than typical covalent bonds. 
B) about 1/10 as strong as typical covalent bonds. 
C) found in every molecule containing more than one hydrogen atom. 
D) found only between H atoms in molecules like H2. 
A) about ten times stronger than typical covalent bonds. 
B) about 1/10 as strong as typical covalent bonds. 
C) found in every molecule containing more than one hydrogen atom. 
D) found only between H atoms in molecules like H2.

Question 4

Generally,the water that has the least harmful contaminants is

Accepted Answer

A) water from the oceans. 
B) surface water from lakes. 
C) groundwater from aquifers. 
D) surface water from rivers. 
A) water from the oceans. 
B) surface water from lakes. 
C) groundwater from aquifers. 
D) surface water from rivers.

Question 5

The correct name for CuO is

Accepted Answer

A) copper oxide. 
B) monocopper oxide. 
C) copper(I)oxide. 
D) copper(II)oxide. 
A) copper oxide. 
B) monocopper oxide. 
C) copper(I)oxide. 
D) copper(II)oxide.

Question 6

When the ________molecules of ethanol,C2H5OH,are added to water,the ethanol molecules

Accepted Answer

A) nonpolar;are attracted to the nonpolar water molecules. 
B) polar;form hydrogen bonds with the polar water molecules. 
C) polar;form covalent bonds with the polar water molecules. 
D) nonpolar;are not attracted to the polar water molecules. 
A) nonpolar;are attracted to the nonpolar water molecules. 
B) polar;form hydrogen bonds with the polar water molecules. 
C) polar;form covalent bonds with the polar water molecules. 
D) nonpolar;are not attracted to the polar water molecules.

Question 7

The main reason that water supplies are "chlorinated" is

Accepted Answer

A) to produce gels that remove solids from the water. 
B) to kill disease-causing organisms in the water. 
C) to soften the water. 
D) to precipitate lead salts from the water as insoluble lead chloride. 
A) to produce gels that remove solids from the water. 
B) to kill disease-causing organisms in the water. 
C) to soften the water. 
D) to precipitate lead salts from the water as insoluble lead chloride.

Question 8

A 0.25 M aqueous solution of potassium chloride,KCl,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.KCl is a nonelectrolyte. 
B) The bulb will not light up.KCl is in the molecular form when dissolved in water. 
C) The light bulb will shine dimly.KCl is only partially ionized in aqueous solution. 
D) The light bulb will shine brightly.KCl is highly ionized in aqueous solution. 
A) The bulb will not light up.KCl is a nonelectrolyte. 
B) The bulb will not light up.KCl is in the molecular form when dissolved in water. 
C) The light bulb will shine dimly.KCl is only partially ionized in aqueous solution. 
D) The light bulb will shine brightly.KCl is highly ionized in aqueous solution.

Question 9

What is biological oxygen demand (BOD)?

Accepted Answer

A) A measure of the amount of dissolved oxygen microorganisms use up as they decompose organic wastes found in water. 
B) A measure of the amount of dissolved oxygen necessary to purify wastewater. 
C) A measure of the phosphate ion concentration of water 
D) A measure of nitrate ion concentration of water. 
A) A measure of the amount of dissolved oxygen microorganisms use up as they decompose organic wastes found in water. 
B) A measure of the amount of dissolved oxygen necessary to purify wastewater. 
C) A measure of the phosphate ion concentration of water 
D) A measure of nitrate ion concentration of water.

Question 10

The steps in the typical purification processes for municipal drinking water are,in order,

Accepted Answer

A) filtration,distillation,chlorination,and filtration. 
B) filtration,chlorination,ozonation,and flocculation. 
C) filtration,flocculation,filtration,and chlorination. 
D) flocculation,filtration,UV irradiation,and filtration. 
A) filtration,distillation,chlorination,and filtration. 
B) filtration,chlorination,ozonation,and flocculation. 
C) filtration,flocculation,filtration,and chlorination. 
D) flocculation,filtration,UV irradiation,and filtration.

Question 11

A student wants to prepare exactly 250 mL of a 0.500 M aqueous potassium hydroxide solution.What mass of potassium hydroxide (molar mass = 56.10 g/mol)must the student dissolve in the 250 mL of solution?

Accepted Answer

A) 56.1 g 
B) 28.1 g 
C) 14.0 g 
D) 7.01 g 
A) 56.1 g 
B) 28.1 g 
C) 14.0 g 
D) 7.01 g

Question 12

The EPA regulates the presence of nitrates and nitrites in food because

Accepted Answer

A) they produce nitrogen in the blood,causing a condition similar to the bends deep sea divers can suffer from. 
B) as with ammonium nitrate fertilizers,they may cause small explosions in blood vessels causing them to rupture. 
C) they interact with naturally occurring ozone in the body and remove it from the circulatory system. 
D) they interact with the blood and limit its ability to transport oxygen. 
A) they produce nitrogen in the blood,causing a condition similar to the bends deep sea divers can suffer from. 
B) as with ammonium nitrate fertilizers,they may cause small explosions in blood vessels causing them to rupture. 
C) they interact with naturally occurring ozone in the body and remove it from the circulatory system. 
D) they interact with the blood and limit its ability to transport oxygen.

Question 13

Numbers 1 through 4 are used to identify four different elements.Based on periodic table trends,which number identifies the element that is expected to have the greatest tendency to attract a shared pair of electrons?

Accepted Answer

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

Question 14

Which is not a form of chlorine used to disinfect water?

Accepted Answer

A) chlorine gas 
B) chloroform 
C) sodium hypochlorite 
D) calcium hypochlorite 
A) chlorine gas 
B) chloroform 
C) sodium hypochlorite 
D) calcium hypochlorite

Question 15

Which of the following is not a consequence of biomagnification?

Accepted Answer

A) Consumption of tuna should be limited. 
B) DDT from fish was killing large birds before the pesticide was banned. 
C) Lead in water can lead to brain damage in children. 
D) Polar compounds are found in high concentrations in predator animals. 
A) Consumption of tuna should be limited. 
B) DDT from fish was killing large birds before the pesticide was banned. 
C) Lead in water can lead to brain damage in children. 
D) Polar compounds are found in high concentrations in predator animals.

Question 16

When table sugar (sucrose,C12H22O11)dissolves in water,which type(s)of attraction between water and sugar molecules occur(s)?
I.hydrogen bonding
II.polar-polar interactions
III.covalent bonding

Accepted Answer

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

Question 17

What is an aquifer?

Accepted Answer

A) a holding tank for disinfected water at the municipal water works 
B) a water purification system developed by the Romans 
C) a large pool of water trapped in sand and gravel below the surface of the earth 
D) a solution in which the solvent is water 
A) a holding tank for disinfected water at the municipal water works 
B) a water purification system developed by the Romans 
C) a large pool of water trapped in sand and gravel below the surface of the earth 
D) a solution in which the solvent is water

Question 18

The world map shows the availability of safe drinking water around the world.Which statement is true?

Accepted Answer

A) In Australia,less than 75% of the population has access to safe drinking water. 
B) In most of Africa,more than 90% of the population has access to clean water. 
C) In Europe and Russia,more than 10% of the population does not have access to clean water. 
D) In the United States and Canada,more than 90% of the population has access to clean water. 
A) In Australia,less than 75% of the population has access to safe drinking water. 
B) In most of Africa,more than 90% of the population has access to clean water. 
C) In Europe and Russia,more than 10% of the population does not have access to clean water. 
D) In the United States and Canada,more than 90% of the population has access to clean water.

Question 19

Which molecule(s)contain(s)polar covalent bonds,but is(are)nonpolar?

Accepted Answer

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

Question 20

What is the molarity of sodium chloride in a solution containing 0.50 mol of sodium chloride in 500 mL of water?

Accepted Answer

A) 0.25 M 
B) 0.50 M 
C) 1.0 M 
D) 5.0 M 
A) 0.25 M 
B) 0.50 M 
C) 1.0 M 
D) 5.0 M

Which compound has a correct formula?

The fact that carbon (C)is less electronegative than nitrogen (N)means that in a C N bond,the

In general,hydrogen bonds are

Generally,the water that has the least harmful contaminants is

The correct name for CuO is

When the ________molecules of ethanol,C₂H₅OH,are added to water,the ethanol molecules

The main reason that water supplies are "chlorinated" is

A 0.25 M aqueous solution of potassium chloride,KCl,is tested for conductivity using the type of apparatus shown.What do you predict will happen?

What is biological oxygen demand (BOD)?

The steps in the typical purification processes for municipal drinking water are,in order,

A student wants to prepare exactly 250 mL of a 0.500 M aqueous potassium hydroxide solution.What mass of potassium hydroxide (molar mass = 56.10 g/mol)must the student dissolve in the 250 mL of solution?

The EPA regulates the presence of nitrates and nitrites in food because

Numbers 1 through 4 are used to identify four different elements.Based on periodic table trends,which number identifies the element that is expected to have the greatest tendency to attract a shared pair of electrons?

Which is not a form of chlorine used to disinfect water?

Which of the following is not a consequence of biomagnification?

When table sugar (sucrose,C₁₂H₂₂O₁₁)dissolves in water,which type(s)of attraction between water and sugar molecules occur(s)? I.hydrogen bonding II.polar-polar interactions III.covalent bonding

What is an aquifer?

The world map shows the availability of safe drinking water around the world.Which statement is true?

Which molecule(s)contain(s)polar covalent bonds,but is(are)nonpolar?

What is the molarity of sodium chloride in a solution containing 0.50 mol of sodium chloride in 500 mL of water?

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 compound has a correct formula?

The fact that carbon (C)is less electronegative than nitrogen (N)means that in a C N bond,the

In general,hydrogen bonds are

Generally,the water that has the least harmful contaminants is

The correct name for CuO is

When the ________molecules of ethanol,C2H5OH,are added to water,the ethanol molecules

The main reason that water supplies are "chlorinated" is

A 0.25 M aqueous solution of potassium chloride,KCl,is tested for conductivity using the type of apparatus shown.What do you predict will happen?

What is biological oxygen demand (BOD)?

The steps in the typical purification processes for municipal drinking water are,in order,

A student wants to prepare exactly 250 mL of a 0.500 M aqueous potassium hydroxide solution.What mass of potassium hydroxide (molar mass = 56.10 g/mol)must the student dissolve in the 250 mL of solution?

The EPA regulates the presence of nitrates and nitrites in food because

Numbers 1 through 4 are used to identify four different elements.Based on periodic table trends,which number identifies the element that is expected to have the greatest tendency to attract a shared pair of electrons?

Which is not a form of chlorine used to disinfect water?

Which of the following is not a consequence of biomagnification?

When table sugar (sucrose,C12H22O11)dissolves in water,which type(s)of attraction between water and sugar molecules occur(s)? I.hydrogen bonding II.polar-polar interactions III.covalent bonding

What is an aquifer?

The world map shows the availability of safe drinking water around the world.Which statement is true?

Which molecule(s)contain(s)polar covalent bonds,but is(are)nonpolar?

What is the molarity of sodium chloride in a solution containing 0.50 mol of sodium chloride in 500 mL of water?

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

When the ________molecules of ethanol,C₂H₅OH,are added to water,the ethanol molecules

When table sugar (sucrose,C₁₂H₂₂O₁₁)dissolves in water,which type(s)of attraction between water and sugar molecules occur(s)? I.hydrogen bonding II.polar-polar interactions III.covalent bonding