Question 1

For the compound Fe3O4,what is the oxidation state of Fe?

Accepted Answer

A) 2+ 
B) 3+ 
C) 4+ 
D) Mixture between 2+ and 3+ 
A) 2+ 
B) 3+ 
C) 4+ 
D) Mixture between 2+ and 3+ D

Question 2

In a fuel cell,

Accepted Answer

A) there is oxidation,but no reduction. 
B) reduction takes place at the cathode. 
C) there is direct conversion of mechanical energy into electricity. 
D) a chemical reaction produces heat,which then produces electricity. 
A) there is oxidation,but no reduction. 
B) reduction takes place at the cathode. 
C) there is direct conversion of mechanical energy into electricity. 
D) a chemical reaction produces heat,which then produces electricity. B

Question 3

What are the typical units for specific energy?

Accepted Answer

A) mAh/g 
B) W/kg 
C) Wh/kg 
D) kWh 
A) mAh/g 
B) W/kg 
C) Wh/kg 
D) kWh C

Question 4

During the chemical reaction in an electrochemical cell,

Accepted Answer

A) a substance is oxidized and gains electrons. 
B) electrons travel from the cathode to the anode. 
C) oxidation takes place alone,without an accompanying reduction. 
D) oxidation occurs at the anode. 
A) a substance is oxidized and gains electrons. 
B) electrons travel from the cathode to the anode. 
C) oxidation takes place alone,without an accompanying reduction. 
D) oxidation occurs at the anode.

Question 5

Which of the following statements is not true about PEM fuel cells?

Accepted Answer

A) PEM fuel cells rely on inexpensive catalysts 
B) PEM fuels cells are cleaner than gasoline powered vehicles 
C) PEM fuel cells have safe and efficient fuel storage 
D) PEM fuel cells have limited driving range 
A) PEM fuel cells rely on inexpensive catalysts 
B) PEM fuels cells are cleaner than gasoline powered vehicles 
C) PEM fuel cells have safe and efficient fuel storage 
D) PEM fuel cells have limited driving range

Question 6

Batteries are still preferred over supercapacitors for portable electronic applications.What factor(s) give rise to this preference?

Accepted Answer

A) Supercapacitors have low energy densities 
B) Supercapacitors are charged much more quickly than batteries 
C) Supercapacitors have virtually unlimited cycle lives 
D) All of these choices are correct 
A) Supercapacitors have low energy densities 
B) Supercapacitors are charged much more quickly than batteries 
C) Supercapacitors have virtually unlimited cycle lives 
D) All of these choices are correct

Question 7

How does the reaction of hydrogen and oxygen to produce energy in a fuel cell differ from their interaction during the direct combustion of hydrogen and oxygen?   I.The direct combustion of hydrogen and oxygen produces several different products,whereas the fuel cell produces only water
II)Much less heat energy is produced in a fuel cell than via direct combustion of hydrogen and oxygen
III)In the fuel cell,there is an oxidation-reduction reaction between hydrogen and oxygen.In the direct combustion of hydrogen and oxygen,there is no such reaction
IV)It is much easier to control the hydrogen and oxygen during direct combustion than during their reaction in a fuel cell

Accepted Answer

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

Question 8

Chemical energy is converted directly into electrical energy in

Accepted Answer

A) a galvanic cell. 
B) an electrical power plant. 
C) an electrolytic cell. 
D) an automobile's engine. 
A) a galvanic cell. 
B) an electrical power plant. 
C) an electrolytic cell. 
D) an automobile's engine.

Question 9

For the compound FeCl3,what is the oxidation state of Fe?

Accepted Answer

A) 2+ 
B) 3+ 
C) 4+ 
D) Mixture between 2+ and 3+ 
A) 2+ 
B) 3+ 
C) 4+ 
D) Mixture between 2+ and 3+

Question 10

Which of the following automotive energy storage devices would give rise to the fastest acceleration from zero to 60 mph?

Accepted Answer

A) Li-ion rechargeable batteries 
B) Fuel cells 
C) NiMH rechargeable batteries 
D) Supercapacitors 
A) Li-ion rechargeable batteries 
B) Fuel cells 
C) NiMH rechargeable batteries 
D) Supercapacitors

Question 11

How do the interactions that are broken in water when it is boiled compare with those broken when water is electrolyzed?

Accepted Answer

A) Boiling water breaks intermolecular attractions and electrolysis breaks covalent bonds 
B) Boiling water breaks covalent bonds and electrolysis breaks intermolecular attractions 
C) Boiling water and electrolysis of water break covalent bonds 
D) Boiling water and electrolysis of water break intermolecular forces 
A) Boiling water breaks intermolecular attractions and electrolysis breaks covalent bonds 
B) Boiling water breaks covalent bonds and electrolysis breaks intermolecular attractions 
C) Boiling water and electrolysis of water break covalent bonds 
D) Boiling water and electrolysis of water break intermolecular forces

Question 12

Why doesn't water naturally become hydrogen and oxygen gas when exposed to light?

Accepted Answer

A) Thermal energy is the only appropriate type of energy to split water 
B) You must use electrons to split water 
C) Water doesn't absorb the proper wavelength of light to split 
A) Thermal energy is the only appropriate type of energy to split water 
B) You must use electrons to split water 
C) Water doesn't absorb the proper wavelength of light to split

Question 13

In this electrochemical cell,the reduction half reaction is

Accepted Answer

A) Cu2+(aq) + 2 e¯ $\rarr$ Cu(s) 
B) Zn(s) $\rarr$ Zn2+(aq) + 2 e¯ 
C) Zn(s) $\rarr$ Cu(s) 
D) Cu2+(aq) $\rarr$ Zn2+(aq) 
A) Cu2+(aq) + 2 e¯ $\rarr$ Cu(s) 
B) Zn(s) $\rarr$ Zn2+(aq) + 2 e¯ 
C) Zn(s) $\rarr$ Cu(s) 
D) Cu2+(aq) $\rarr$ Zn2+(aq)

Question 14

In general,a modern hybrid vehicle is less polluting than a standard vehicle because it runs on both a

Accepted Answer

A) gasoline engine and an electric motor run by a rechargeable battery. 
B) gasoline engine and a fuel cell. 
C) fuel cell and an electric motor run by a rechargeable battery. 
D) gasoline engine and a cleaner diesel engine. 
A) gasoline engine and an electric motor run by a rechargeable battery. 
B) gasoline engine and a fuel cell. 
C) fuel cell and an electric motor run by a rechargeable battery. 
D) gasoline engine and a cleaner diesel engine.

Question 15

Why is it so expensive to ship hydrogen as a liquid as is often done with other gas?

Accepted Answer

A) Hydrogen is very heavy to ship 
B) Hydrogen is very dense to ship 
C) Hydrogen has to be shipped at a very low temperature 
D) Hydrogen in very flammable 
A) Hydrogen is very heavy to ship 
B) Hydrogen is very dense to ship 
C) Hydrogen has to be shipped at a very low temperature 
D) Hydrogen in very flammable

Question 16

Whenever a substance is oxidized,

Accepted Answer

A) it is called the oxidizing agent. 
B) some other substance must be reduced. 
C) it gains electrons. 
D) hydronium ions are produced. 
A) it is called the oxidizing agent. 
B) some other substance must be reduced. 
C) it gains electrons. 
D) hydronium ions are produced.

Question 17

A NiCd battery uses nickel and cadmium to produce a potential difference.Using these equations,answer the following questions.
I.2NiO(OH) (s) + 2H2O (l) + 2 e¯ $\rarr$ 2Ni(OH)2 (s) + 2 OH¯ (aq)
II.Cd(s) + 2OH¯ (aq) $\rarr$ Cd(OH)2 (s) + 2e¯
III.Cd (s) + 2NiO(OH) (s) + 2 H2O (l) $\rarr$ 2 Ni(OH)2 (s) + Cd(OH)2 (s)
Which equation represents what takes place at the anode?

Accepted Answer

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

Question 18

Reforming processes can store hydrogen fuel in a liquid form as another molecule.Which of the following cannot be reformed into hydrogen?

Accepted Answer

A) Methanol 
B) Gasoline 
C) Diesel 
D) Carbon dioxide 
A) Methanol 
B) Gasoline 
C) Diesel 
D) Carbon dioxide

For the compound Fe₃O₄,what is the oxidation state of Fe?

In a fuel cell,

What are the typical units for specific energy?

During the chemical reaction in an electrochemical cell,

Which of the following statements is not true about PEM fuel cells?

Batteries are still preferred over supercapacitors for portable electronic applications.What factor(s) give rise to this preference?

Chemical energy is converted directly into electrical energy in

For the compound FeCl₃,what is the oxidation state of Fe?

Which of the following automotive energy storage devices would give rise to the fastest acceleration from zero to 60 mph?

How do the interactions that are broken in water when it is boiled compare with those broken when water is electrolyzed?

Why doesn't water naturally become hydrogen and oxygen gas when exposed to light?

In this electrochemical cell,the reduction half reaction is

In general,a modern hybrid vehicle is less polluting than a standard vehicle because it runs on both a

Why is it so expensive to ship hydrogen as a liquid as is often done with other gas?

Whenever a substance is oxidized,

Reforming processes can store hydrogen fuel in a liquid form as another molecule.Which of the following cannot be reformed into hydrogen?

Portable Electronics: the Periodic Table in the Palm of Your Hand

The Air We Breathe

Radiation From the Sun

Climate Change

Energy From Combustion

Energy From Alternative Sources

Water Everywhere: A Most Precious Resource

The World of Polymers and Plastics

Brewing and Chewing

Nutrition

Health Medicine

Genes and Life

Who Killed Drthompson a Forensic Mystery

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Exam 7: Energy Storage

For the compound Fe3O4,what is the oxidation state of Fe?

In a fuel cell,

What are the typical units for specific energy?

During the chemical reaction in an electrochemical cell,

Which of the following statements is not true about PEM fuel cells?

Batteries are still preferred over supercapacitors for portable electronic applications.What factor(s) give rise to this preference?

Chemical energy is converted directly into electrical energy in

For the compound FeCl3,what is the oxidation state of Fe?

Which of the following automotive energy storage devices would give rise to the fastest acceleration from zero to 60 mph?

How do the interactions that are broken in water when it is boiled compare with those broken when water is electrolyzed?

Why doesn't water naturally become hydrogen and oxygen gas when exposed to light?

In this electrochemical cell,the reduction half reaction is

In general,a modern hybrid vehicle is less polluting than a standard vehicle because it runs on both a

Why is it so expensive to ship hydrogen as a liquid as is often done with other gas?

Whenever a substance is oxidized,

Reforming processes can store hydrogen fuel in a liquid form as another molecule.Which of the following cannot be reformed into hydrogen?

Portable Electronics: the Periodic Table in the Palm of Your Hand

The Air We Breathe

Radiation From the Sun

Climate Change

Energy From Combustion

Energy From Alternative Sources

Water Everywhere: A Most Precious Resource

The World of Polymers and Plastics

Brewing and Chewing

Nutrition

Health Medicine

Genes and Life

Who Killed Drthompson a Forensic Mystery

Filters

For the compound Fe₃O₄,what is the oxidation state of Fe?

For the compound FeCl₃,what is the oxidation state of Fe?