APCE Electrochemistry

Question 1

What is the definition of oxidation in a redox reaction?

Accepted Answer

Loss of electrons.

Answer

Gain of electrons.

Answer

Gain of protons.

Answer

Loss of protons.

Question 2

What is reduction in a redox reaction?

Accepted Answer

Gain of electrons.

Answer

Loss of electrons.

Answer

Loss of protons.

Answer

Gain of protons.

Question 3

What does the electrode potential indicate?

Accepted Answer

The tendency of a substance to gain or lose electrons.

Answer

The likelihood of a substance to donate protons.

Answer

The amount of heat released in a reaction.

Answer

The temperature at which a reaction occurs.

Question 4

What is the role of a salt bridge in an electrochemical cell?

Accepted Answer

To allow ion exchange and maintain electrical neutrality.

Answer

To facilitate the movement of electrons.

Answer

To act as a power source.

Answer

To store energy.

Question 5

What is the standard electrode potential for the hydrogen ion (H⁺) half-cell?

Accepted Answer

0.00 V.

Answer

1.00 V.

Answer

0.50 V.

Answer

-1.00 V.

Question 6

What is a galvanic cell?

Accepted Answer

A cell that generates electricity from spontaneous reactions.

Answer

A cell that requires an external power source.

Answer

A cell that uses energy to drive a non-spontaneous reaction.

Answer

A cell that stores chemical energy.

Question 7

What is the Nernst equation used for?

Accepted Answer

To calculate the cell potential under non-standard conditions.

Answer

To calculate the number of electrons involved in the reaction.

Answer

To calculate the activation energy of the reaction.

Answer

To determine the concentration of ions in a solution.

Question 8

What is the purpose of electrolysis?

Accepted Answer

To use electricity to induce a chemical reaction.

Answer

To generate electricity from spontaneous reactions.

Answer

To create electrical energy.

Answer

To separate ions from a solution.

Question 9

What is the relationship between the cell potential and the spontaneity of a reaction?

Accepted Answer

A positive cell potential indicates a spontaneous reaction.

Answer

A positive cell potential indicates a non-spontaneous reaction.

Answer

A negative cell potential indicates a spontaneous reaction.

Answer

Cell potential does not affect spontaneity.