AP Chemistry: Electrochemistry 2

Question 1

In a galvanic cell, oxidation always occurs at which electrode?

Accepted Answer

The anode

Answer

Oxidation occurs at the anode in any electrochemical cell.

Question 2

What is the standard cell potential of a cell with E°(cathode) = +0.80 V and E°(anode) = +0.34 V?

Accepted Answer

+0.46 V

Answer

E°cell = E°cathode − E°anode = 0.80 − 0.34 = +0.46 V.

Question 3

A positive standard cell potential indicates the reaction is:

Accepted Answer

Spontaneous

Answer

A positive E°cell corresponds to a negative ΔG°, meaning the reaction is spontaneous.

Question 4

In a salt bridge containing KNO₃, which ions migrate toward the anode compartment?

Accepted Answer

Anions (NO₃⁻)

Answer

Anions migrate toward the anode to balance the positive charge from oxidation.

Question 5

Which equation relates standard cell potential to the equilibrium constant?

Accepted Answer

ΔG° = −RT ln K = −nFE°

Answer

ΔG° = −nFE° = −RT ln K links cell potential and the equilibrium constant.

AP Practice Test