Electrochemical Cells

Question 1

What part of an electrochemical cell conducts electricity between the cell and its surroundings?

Answer 1

Electrode

Question 2

In an electrochemical cell, what is the mix of ions that carries the charge?

Answer 2

Electrolyte

Question 3

What is the electrode where oxidation occurs?

Answer 3

Anode

Question 4

What is the electrode where reduction occurs?

Answer 4

Cathode

Question 5

What type of electrochemical cell uses a spontaneous redox reaction to generate energy?

Answer 5

Voltaic

Question 6

What type of electrochemical cell uses electrical energy to drive a nonspontaneous chemical reaction?

Answer 6

Electrolytic

Question 7

ΔG is negative for a voltaic or electrolytic cell?

Answer 7

Voltaic

Question 8

ΔG is positive for a voltaic or electrolytic cell?

Answer 8

Electrolytic

Question 9

What is the difference in electrical potential between two electrodes of an electrochemical cell called?

Answer 9

The cell potential (E cell)
AKA electromotive force or voltage

Question 10

When E cell is positive, is the reaction spontaneous?

Answer 10

Yes

Question 11

When E cell is negative, is the reaction spontaneous?

Answer 11

No, it is non-spontaneous

Question 12

When E cell = 0, is the reaction spontaneous?

Answer 12

The reaction is at equilbrium

Question 13

Do electrons spontaneously flow toward the electode with the more positive or negative electrical potential?

Answer 13

Positive

Question 14

What is the cell potential measured with components in their standard states?

Answer 14

Standard cell potential (E°cell)

Question 15

What is the unit of electrical potential?

Answer 15

Volt (V)

Question 16

Does a reaction occur more readily with a positive or negative E° cell value?

Answer 16

Positive

Question 17

What is the cell potential of a half-cell called?

Answer 17

Electrode potential or standard reduction potential

Question 18

When a standard reduction potential is more negative, is the component a stronger reducing or oxidizing agent?

Answer 18

Stronger reducing agent
This means it is oxidized

Question 19

When a standard reduction potential is more positive, is the component a stronger reducing or oxidizing agent?

Answer 19

Stronger oxidizing agent
This means it is reduced

Question 20

What is the formula for the E° cell from the E°cathode and E°anode?

Answer 20

E°cell = E°cathode - E°anode

Question 21

In a voltaic cell, is the less active metal the anode or the cathode?

Answer 21

Cathode

Question 22

In a voltaic cell, is the more active metal the anode or the cathode?

Answer 22

Anode

Question 23

What is the formula for ΔG from E cell?

Answer 23

ΔG rxn = -nFEcell
n = moles of electrons transferred
F = Faraday’s constant, 96485 C

Question 24

What is the standard electrode potential measured against?

Answer 24

The stnadard hydrogen electrode (SHE)
H2(g) -><- 2H+ (aq) + 2e-