19.2.1 Electrochemical Cells Flashcards

1
Q

Electrochemical Cells

A
  • In a galvanic cell (or voltaic cell), electrical energy is produced by separating spontaneously occurring redox reactions into half-cells.
  • In an electrolytic cell, electrical energy is used to drive nonspontaneous redox reactions.
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2
Q

note

A
  • Spontaneously occurring redox reactions can be separated into half-cells and harnessed to do work. This type of electrochemical cell is called a galvanic cell or voltaic cell.
  • The anode is the half-cell in which oxidation occurs, while the cathode is the half-cell in which reduction occurs.
  • A salt bridge is used to allow non-reacting ions to flow to allow the solutions to remain neutral.
  • Electrical energy can be used to drive nonspontaneous redox reactions. This type of electrochemical cell is called an electrolytic cell.
  • The anode is still the half-cell in which oxidation occurs, and the cathode is still the half-cell in which reduction occurs.
  • Electrolytic cells can be used to cause reactions to occur which would not occur otherwise. For example, gold and silver metal can be plated out of solution onto other metals.
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3
Q

In the following reaction, which half reaction would take place at the anode?

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)

A

Zn(s) → Zn2+ (aq) + 2e−

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4
Q

In the following galvanic cell, where would metal be consumed?

A

A

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5
Q

What is the purpose of the salt bridge in a galvanic cell?

A
  • Completing the electrical circuit
  • Maintaining a balance of ions in the separate compartments
  • Maintaining a balance of electrical charge in the separate compartments
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6
Q

Which of the following is a nonspontaneous reaction?

A

Electrolytic cell

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7
Q

Where is the site of oxidation in a galvanic cell?

A

Anode

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8
Q

Where does the deposition of metal occur in an electrolytic cell?

A

Cathode

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9
Q

In the following reaction, which half reaction would take place at the cathode?

Cu(s) + 2Ag+ (aq) → Cu2+ (aq) + 2Ag(s)

A

2Ag+ (aq) + 2e− → 2Ag(s)

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10
Q

In the diagram of an electrolytic cell, where is oxidation taking place?

A

A

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11
Q

Where does oxidation occur in an electrolytic cell?

A

Anode

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12
Q

In the diagram of an galvanic cell, which is the anode?

A

A

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13
Q

In the following electrolytic cell, where would metal be plated?

A

D

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