Question 1

What moves in the salt bridge from the cathode to the anode?

Accepted Answer

A) electrons 
B) Zn+2 ions 
C) Cu+2 ions 
D) anions 
A) electrons 
B) Zn+2 ions 
C) Cu+2 ions 
D) anions D

Question 2

In recently designed fuel cells the corrosive acidic or alkaline electrolyte is replaced with

Accepted Answer

A) a solid polymer. 
B) mercury. 
C) lead. 
D) pure water. 
A) a solid polymer. 
B) mercury. 
C) lead. 
D) pure water. A

Question 3

Among the alternative sources for generating electricity are
I.batteries.
II.fuel cells.
III.solar cells.
In populated but remote regions where it has proven too expensive or too difficult to establish electrical networks,which is/are the most viable alternative method(s)of providing electricity?

Accepted Answer

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

Question 4

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 5

The aluminum-air battery is being considered for use in automobiles.In this battery,aluminum metal undergoes oxidation to Al3+ ions and forms Al(OH)3.O2 from the air undergoes reduction to OH¯ ions.Which half-reaction occurs at the anode?

Accepted Answer

A) formation of OH¯ ions from O2. 
B) capturing O2 from the air so that it may form the OH¯ ions. 
C) formation of Al3+ ions from aluminum. 
D) reaction of Al3+ ions with hydroxide ions to produce Al(OH)3. 
A) formation of OH¯ ions from O2. 
B) capturing O2 from the air so that it may form the OH¯ ions. 
C) formation of Al3+ ions from aluminum. 
D) reaction of Al3+ ions with hydroxide ions to produce Al(OH)3.

Question 6

What about the bonding of silicon makes it useful as a semiconductor but not as a conductor of electricity?

Accepted Answer

A) The electrons are transferred forming ions that conduct electricity. 
B) The electrons are shared in covalent bonds between atoms. 
C) The electrons form a "sea of electrons" that move between many atoms. 
D) The electrons are somewhat shared and somewhat transferred because it is a metalloiD. 
A) The electrons are transferred forming ions that conduct electricity. 
B) The electrons are shared in covalent bonds between atoms. 
C) The electrons form a "sea of electrons" that move between many atoms. 
D) The electrons are somewhat shared and somewhat transferred because it is a metalloiD.

Question 7

What condition must be met for a battery to be rechargeable?

Accepted Answer

A) Either its anode or its cathode must generate a gas as a result of the electrochemical reaction. 
B) It must generate electricity via an acid-base reaction rather than via an oxidation-reduction reaction. 
C) The battery must be open to the outside so that it can vent any internal pressure that builds up from gases within it. 
D) The electrochemical reaction of the battery must be reversible. 
A) Either its anode or its cathode must generate a gas as a result of the electrochemical reaction. 
B) It must generate electricity via an acid-base reaction rather than via an oxidation-reduction reaction. 
C) The battery must be open to the outside so that it can vent any internal pressure that builds up from gases within it. 
D) The electrochemical reaction of the battery must be reversible.

Question 8

Given this diagram,  
This semiconductor is

Accepted Answer

A) made of pure silicon. 
B) carrying an extra electron. 
C) missing an electron. 
D) excited by a photon. 
A) made of pure silicon. 
B) carrying an extra electron. 
C) missing an electron. 
D) excited by a photon.

Question 9

As of 2007,what is the maximum efficiency of a multijunction solar cell?

Accepted Answer

A) 15% 
B) 80% 
C) 22% 
D) 40% 
A) 15% 
B) 80% 
C) 22% 
D) 40%

Question 10

Which is not a valid argument supporting the switch from using fossil fuels to using solar cells to generate our electricity?

Accepted Answer

A) The conversion reduces environmental damage from the extraction and transport of fossil fuels. 
B) The conversion will lower the level of air pollution from sulfur and nitrogen oxides. 
C) The conversion can be done quickly,efficiently,and relatively inexpensively if we just put our minds and our will to it. 
D) The conversion will reduce the potential for global warming as less carbon dioxide is produced in the generation of electricity. 
A) The conversion reduces environmental damage from the extraction and transport of fossil fuels. 
B) The conversion will lower the level of air pollution from sulfur and nitrogen oxides. 
C) The conversion can be done quickly,efficiently,and relatively inexpensively if we just put our minds and our will to it. 
D) The conversion will reduce the potential for global warming as less carbon dioxide is produced in the generation of electricity.

Question 11

Which is not a current or planned use for the electricity generated by fuel cells?

Accepted Answer

A) as the output of small power plants 
B) to operate space shuttles 
C) to control nuclear fusion 
D) to power a cell phone 
A) as the output of small power plants 
B) to operate space shuttles 
C) to control nuclear fusion 
D) to power a cell phone

Question 12

To date,solar radiation is not a practical source for the production of electricity used to power

Accepted Answer

A) electric highway signs. 
B) security lighting in parking lots. 
C) satellites in orbit around the earth. 
D) fleets of taxis. 
A) electric highway signs. 
B) security lighting in parking lots. 
C) satellites in orbit around the earth. 
D) fleets of taxis.

Question 13

Sunlight (solar radiation)may be turned directly into electricity using ______ cells.

Accepted Answer

A) fuel 
B) photovoltaic 
C) electrolytic 
D) lead-acid 
A) fuel 
B) photovoltaic 
C) electrolytic 
D) lead-acid

Question 14

Which is not a component of a fuel cell?

Accepted Answer

A) a timer 
B) an anode 
C) a cathode 
D) an electrolyte 
A) a timer 
B) an anode 
C) a cathode 
D) an electrolyte

Question 15

In this electrochemical cell,the reduction half reaction is

Accepted Answer

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

Question 16

A fuel cell does not "run down" like a standard battery because

Accepted Answer

A) the reactants in a battery must be stored inside the battery,whereas the reactants for a fuel cell flow in as needed. 
B) a fuel cell continually recycles the same electrons,whereas a battery must continually generate new ones. 
C) a battery is completely dependent upon oxidation-reduction reactions,whereas a fuel cell depends on acid-base reactions. 
D) a battery has many moving parts,whereas a fuel cell has none. 
A) the reactants in a battery must be stored inside the battery,whereas the reactants for a fuel cell flow in as needed. 
B) a fuel cell continually recycles the same electrons,whereas a battery must continually generate new ones. 
C) a battery is completely dependent upon oxidation-reduction reactions,whereas a fuel cell depends on acid-base reactions. 
D) a battery has many moving parts,whereas a fuel cell has none.

Question 17

What is the primary determinant of the voltage developed by a battery?

Accepted Answer

A) the nature of the materials in the reaction 
B) the age of the battery 
C) the overall size of the galvanic cells 
D) the size of the electrodes 
A) the nature of the materials in the reaction 
B) the age of the battery 
C) the overall size of the galvanic cells 
D) the size of the electrodes

Question 18

What is the purpose of the hot KOH solution in the fuel cell?

Accepted Answer

A) It is the product of the reaction between the hydrogen,the oxygen,and the electrodes. 
B) It keeps the electrodes conditioned and ready to work at high efficiency. 
C) It is part of the acid-base reaction that generates the electricity in most fuel cells. 
D) It maintains electroneutrality by working as an electrolyte;allowing transfer of ions between the half cells where the hydrogen and oxygen react. 
A) It is the product of the reaction between the hydrogen,the oxygen,and the electrodes. 
B) It keeps the electrodes conditioned and ready to work at high efficiency. 
C) It is part of the acid-base reaction that generates the electricity in most fuel cells. 
D) It maintains electroneutrality by working as an electrolyte;allowing transfer of ions between the half cells where the hydrogen and oxygen react.

Question 19

Why can the lead-acid batteries used in cars generate electricity for several years before running down?

Accepted Answer

A) A lead-acid battery is so large that it holds large quantities of the chemicals whose electrochemical interaction creates the electricity. 
B) The mechanical motion of the engine drives an alternator that generates electricity to recharge the battery. 
C) These batteries are used only to generate the electricity that makes the first spark plug "spark." Therefore,they are hardly used at all when a car is started,and never when it is driven. 
D) The electrons they generate,not the chemical components,provide almost all of the electricity. 
A) A lead-acid battery is so large that it holds large quantities of the chemicals whose electrochemical interaction creates the electricity. 
B) The mechanical motion of the engine drives an alternator that generates electricity to recharge the battery. 
C) These batteries are used only to generate the electricity that makes the first spark plug "spark." Therefore,they are hardly used at all when a car is started,and never when it is driven. 
D) The electrons they generate,not the chemical components,provide almost all of the electricity.

Question 20

As fuel cells become more widely accepted and are used more,we will

Accepted Answer

A) become less dependent on electrical energy. 
B) become more dependent on fossil fuels and less dependent on renewable resources for power generation. 
C) be able to generate electricity in places where we cannot now do so. 
D) use coal as our primary energy source. 
A) become less dependent on electrical energy. 
B) become more dependent on fossil fuels and less dependent on renewable resources for power generation. 
C) be able to generate electricity in places where we cannot now do so. 
D) use coal as our primary energy source.

What moves in the salt bridge from the cathode to the anode?

In recently designed fuel cells the corrosive acidic or alkaline electrolyte is replaced with

Among the alternative sources for generating electricity are I.batteries. II.fuel cells. III.solar cells. In populated but remote regions where it has proven too expensive or too difficult to establish electrical networks,which is/are the most viable alternative method(s)of providing electricity?

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

The aluminum-air battery is being considered for use in automobiles.In this battery,aluminum metal undergoes oxidation to Al³⁺ ions and forms Al(OH)₃.O₂ from the air undergoes reduction to OH¯ ions.Which half-reaction occurs at the anode?

What about the bonding of silicon makes it useful as a semiconductor but not as a conductor of electricity?

What condition must be met for a battery to be rechargeable?

Given this diagram, This semiconductor is

As of 2007,what is the maximum efficiency of a multijunction solar cell?

Which is not a valid argument supporting the switch from using fossil fuels to using solar cells to generate our electricity?

Which is not a current or planned use for the electricity generated by fuel cells?

To date,solar radiation is not a practical source for the production of electricity used to power

Sunlight (solar radiation)may be turned directly into electricity using ______ cells.

Which is not a component of a fuel cell?

In this electrochemical cell,the reduction half reaction is

A fuel cell does not "run down" like a standard battery because

What is the primary determinant of the voltage developed by a battery?

What is the purpose of the hot KOH solution in the fuel cell?

Why can the lead-acid batteries used in cars generate electricity for several years before running down?

As fuel cells become more widely accepted and are used more,we will

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

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Exam 8: Energy From Electron Transfer

What moves in the salt bridge from the cathode to the anode?

In recently designed fuel cells the corrosive acidic or alkaline electrolyte is replaced with

Among the alternative sources for generating electricity are I.batteries. II.fuel cells. III.solar cells. In populated but remote regions where it has proven too expensive or too difficult to establish electrical networks,which is/are the most viable alternative method(s)of providing electricity?

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

The aluminum-air battery is being considered for use in automobiles.In this battery,aluminum metal undergoes oxidation to Al3+ ions and forms Al(OH)3.O2 from the air undergoes reduction to OH¯ ions.Which half-reaction occurs at the anode?

What about the bonding of silicon makes it useful as a semiconductor but not as a conductor of electricity?

What condition must be met for a battery to be rechargeable?

Given this diagram, This semiconductor is

As of 2007,what is the maximum efficiency of a multijunction solar cell?

Which is not a valid argument supporting the switch from using fossil fuels to using solar cells to generate our electricity?

Which is not a current or planned use for the electricity generated by fuel cells?

To date,solar radiation is not a practical source for the production of electricity used to power

Sunlight (solar radiation)may be turned directly into electricity using ______ cells.

Which is not a component of a fuel cell?

In this electrochemical cell,the reduction half reaction is

A fuel cell does not "run down" like a standard battery because

What is the primary determinant of the voltage developed by a battery?

What is the purpose of the hot KOH solution in the fuel cell?

Why can the lead-acid batteries used in cars generate electricity for several years before running down?

As fuel cells become more widely accepted and are used more,we will

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

The aluminum-air battery is being considered for use in automobiles.In this battery,aluminum metal undergoes oxidation to Al³⁺ ions and forms Al(OH)₃.O₂ from the air undergoes reduction to OH¯ ions.Which half-reaction occurs at the anode?