Question 1

In a solar cell,placing semiconductors of the p-type and n-type in contact with each other via a conducting wire accomplishes these two things:

Accepted Answer

A) It ensures that the current flows in a specific direction as it facilitates the conduction of electricity. 
B) It ensures that only certain energies of solar radiation cause electricity to flow as it facilitates the conduction of electricity. 
C) It ensures that only certain energies of solar radiation cause electricity to flow as it facilitates the flow of electricity in either direction. 
D) It ensures that only oxidation takes place as it facilitates the conduction of electricity. 
A) It ensures that the current flows in a specific direction as it facilitates the conduction of electricity. 
B) It ensures that only certain energies of solar radiation cause electricity to flow as it facilitates the conduction of electricity. 
C) It ensures that only certain energies of solar radiation cause electricity to flow as it facilitates the flow of electricity in either direction. 
D) It ensures that only oxidation takes place as it facilitates the conduction of electricity.

Question 2

The "doping" of a semiconductor to improve its performance means

Accepted Answer

A) slightly raising the temperature of a pure semiconductor to improve the ability of its electrons to flow from atom to atom. 
B) fusing layers of two different pure semiconductors together to give the electrons that absorb the solar radiation characteristics of the electrons of both semiconductors. 
C) mixing large amounts of a metal with small amounts of a semiconductor so that the metal itself becomes a semiconductor. 
D) adding small amounts of other elements to the pure semiconductor to change the freedom of electron motion throughout the crystal. 
A) slightly raising the temperature of a pure semiconductor to improve the ability of its electrons to flow from atom to atom. 
B) fusing layers of two different pure semiconductors together to give the electrons that absorb the solar radiation characteristics of the electrons of both semiconductors. 
C) mixing large amounts of a metal with small amounts of a semiconductor so that the metal itself becomes a semiconductor. 
D) adding small amounts of other elements to the pure semiconductor to change the freedom of electron motion throughout the crystal.

Question 3

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.

Question 4

Chemical energy is converted directly into electrical energy in

Accepted Answer

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

Question 5

What sort of energy is associated with energy from wind?

Accepted Answer

A) Potential energy 
B) Thermal energy 
C) Kinetic energy 
D) Chemical energy 
A) Potential energy 
B) Thermal energy 
C) Kinetic energy 
D) Chemical energy

Question 6

A NiCd battery uses nickel and cadmium to produce a potential difference. Using these equations, answer the following questions.
 
-Which equation best represents the reduction half-reaction?

Accepted Answer

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

Question 7

How does using hydrogen as the fuel in an electric power plant compare with using hydrogen as the fuel in a fuel cell?

Accepted Answer

A) H2 used as a fuel in a power plant must be more pure than the H2 used in a fuel cell. 
B) Burning H2 in a power plant produces many more pollutants than using H2 in a fuel cell. 
C) A fuel cell using hydrogen operates at a higher overall efficiency than would a power plant burning hydrogen as a fuel. 
D) Using H2 in a fuel cell generates far more heat than burning it in a power plant. 
A) H2 used as a fuel in a power plant must be more pure than the H2 used in a fuel cell. 
B) Burning H2 in a power plant produces many more pollutants than using H2 in a fuel cell. 
C) A fuel cell using hydrogen operates at a higher overall efficiency than would a power plant burning hydrogen as a fuel. 
D) Using H2 in a fuel cell generates far more heat than burning it in a power plant.

Question 8

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 9

What metal is used to dope an n-type semiconductor?

Accepted Answer

A) arsenic 
B) cadmium 
C) gallium 
D) silicon 
A) arsenic 
B) cadmium 
C) gallium 
D) silicon

Question 10

The opposite of a galvanic cell is

Accepted Answer

A) a battery. 
B) an electrolytic cell. 
C) a fuel cell. 
D) a photovoltaic (solar)cell. 
A) a battery. 
B) an electrolytic cell. 
C) a fuel cell. 
D) a photovoltaic (solar)cell.

Question 11

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

Question 12

Very small mercury batteries have been made and used in a multitude of applications.Why have they been replaced by other kinds of batteries for most applications?

Accepted Answer

A) Mercury has become far too expensive to use in batteries. 
B) Mercury is poisonous and difficult to dispose of. 
C) These batteries cannot generate enough current for any modern devices. 
D) Though they may be made very small,they are far too heavy to use in most applications. 
A) Mercury has become far too expensive to use in batteries. 
B) Mercury is poisonous and difficult to dispose of. 
C) These batteries cannot generate enough current for any modern devices. 
D) Though they may be made very small,they are far too heavy to use in most applications.

Question 13

In this photovoltaic (solar)cell,  
The n-type semiconductor is in the region labeled

Accepted Answer

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

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

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 16

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 17

In a voltaic cell,

Accepted Answer

A) oxidation takes place at the cathode. 
B) reduction takes place at the anode. 
C) oxidation and reduction take place at the same time at the anode and cathode respectively. 
D) electrical energy is used to reverse spontaneous chemical reactions. 
A) oxidation takes place at the cathode. 
B) reduction takes place at the anode. 
C) oxidation and reduction take place at the same time at the anode and cathode respectively. 
D) electrical energy is used to reverse spontaneous chemical reactions.

Question 18

Compare commercial electrical power plants,batteries,and solar cells in terms of their efficiencies in producing electrical energy.Rank them from least efficient to most efficient.

Accepted Answer

A) solar cells,batteries,electrical power plants 
B) electrical power plants,solar cells,batteries 
C) batteries,solar cells,electrical power plants 
D) solar cells,electrical power plants,batteries 
A) solar cells,batteries,electrical power plants 
B) electrical power plants,solar cells,batteries 
C) batteries,solar cells,electrical power plants 
D) solar cells,electrical power plants,batteries

Question 19

Which type of battery is widely used to store the excess energy generated by windmill farms and solar panels?

Accepted Answer

A) alkaline 
B) lithium ion 
C) lead acid 
D) nickel-metal hydride 
A) alkaline 
B) lithium ion 
C) lead acid 
D) nickel-metal hydride

Question 20

Which type of widely used battery is not rechargeable?

Accepted Answer

A) zinc-manganese alkaline 
B) lithium-ion 
C) lead-acid (storage batteries) 
D) nickel-cadmium (NiCad) 
A) zinc-manganese alkaline 
B) lithium-ion 
C) lead-acid (storage batteries) 
D) nickel-cadmium (NiCad)

In a solar cell,placing semiconductors of the p-type and n-type in contact with each other via a conducting wire accomplishes these two things:

The "doping" of a semiconductor to improve its performance means

In a fuel cell,

Chemical energy is converted directly into electrical energy in

What sort of energy is associated with energy from wind?

A NiCd battery uses nickel and cadmium to produce a potential difference. Using these equations, answer the following questions. -Which equation best represents the reduction half-reaction?

How does using hydrogen as the fuel in an electric power plant compare with using hydrogen as the fuel in a fuel cell?

During the chemical reaction in an electrochemical cell,

What metal is used to dope an n-type semiconductor?

The opposite of a galvanic cell is

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

Very small mercury batteries have been made and used in a multitude of applications.Why have they been replaced by other kinds of batteries for most applications?

In this photovoltaic (solar)cell, The n-type semiconductor is in the region labeled

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

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

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

In a voltaic cell,

Compare commercial electrical power plants,batteries,and solar cells in terms of their efficiencies in producing electrical energy.Rank them from least efficient to most efficient.

Which type of battery is widely used to store the excess energy generated by windmill farms and solar panels?

Which type of widely used battery is not rechargeable?

The Air We Breathe

Protecting the Ozone Layer

The Chemistry of Global Climate Change

Energy From Combustion

Water for Life

Neutralizing the Threat of Acid Rain

The Fires of Nuclear Fission

The World of Polymers and Plastics

Manipulating Molecules and Designing Drugs

Nutrition: Food for Thought

Genetic Engineering and the Molecules of Life

Filters

Exam 8: Energy From Electron Transfer

In a solar cell,placing semiconductors of the p-type and n-type in contact with each other via a conducting wire accomplishes these two things:

The "doping" of a semiconductor to improve its performance means

In a fuel cell,

Chemical energy is converted directly into electrical energy in

What sort of energy is associated with energy from wind?

A NiCd battery uses nickel and cadmium to produce a potential difference. Using these equations, answer the following questions. -Which equation best represents the reduction half-reaction?

How does using hydrogen as the fuel in an electric power plant compare with using hydrogen as the fuel in a fuel cell?

During the chemical reaction in an electrochemical cell,

What metal is used to dope an n-type semiconductor?

The opposite of a galvanic cell is

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

Very small mercury batteries have been made and used in a multitude of applications.Why have they been replaced by other kinds of batteries for most applications?

In this photovoltaic (solar)cell, The n-type semiconductor is in the region labeled

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

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

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

In a voltaic cell,

Compare commercial electrical power plants,batteries,and solar cells in terms of their efficiencies in producing electrical energy.Rank them from least efficient to most efficient.

Which type of battery is widely used to store the excess energy generated by windmill farms and solar panels?

Which type of widely used battery is not rechargeable?

The Air We Breathe

Protecting the Ozone Layer

The Chemistry of Global Climate Change

Energy From Combustion

Water for Life

Neutralizing the Threat of Acid Rain

The Fires of Nuclear Fission

The World of Polymers and Plastics

Manipulating Molecules and Designing Drugs

Nutrition: Food for Thought

Genetic Engineering and the Molecules of Life

Filters