Chapter 12

Question 1

Galvanic (Voltaic) Cell

Answer 1

• Spontaneous
• • ∆G
• • Ecell

Anode:
* Site of oxidation
* Current flows toward it
* Has - designation

Cathode:
* Electrons flow towards it
* Attracts cations

Question 2

Electrolytic Cell

Answer 2

• Nonspontaneous
• • ∆G
• • Ecell

Anode:
* Site of oxidation
* Current flows toward it

Cathode:
* Electrons flow toward it
* Has - designation
* Attracts cations

Question 3

Lead-Acid Battery

Answer 3

• Rechargeable

Charging:
* Electrolytic
* Anode: PbSO4 (+ charge)
* Cathode: PbSO4 (- charge)

Discharging:
* Galvanic
* Anode: Pb (- charge)
* Cathode: PbO2 (+ charge)

Cell diagram image below

Question 4

Nickel-Cadmium (Ni-Cd) Batteries

Answer 4

• Rechargeable

Charging:
* Electrolytic
* Anode: Cd(OH)2 (+ charge)
* Cathode: Ni(OH)2 (- charge)

Discharging:
* Galvanic
* Anode: Cd (- charge)
* Cathode: NiO(OH) (+ charge)

Question 5

Molten NaCl Battery

Answer 5

• Always electrolytic

Discharging:
* Anode: Any (- charge)
* Cathode: Any (+ charge)

Question 6

Daniell Cell

Answer 6

• Always galvanic

Discharging:
* Anode: Zn (- charge)
* Cathode: Cu (+ charge)

Question 7

Electrodeposition Equation

Answer 7

Question 8

Standard Reduction Potentials (E˚red)

Answer 8

• Measured by setting up cell relative to standard Hydrogen electrode (given reduction potential of 0 V by convention)

Highest reduction potential: reduced
Lowest reduction potential: oxidized

Question 9

Electromotive Force (emf)

Answer 9

Positive:
* Spontaneous cell
* Galvanic

Negative:
* Nonspontaneous cell
* Electrolytic