Redox Reactions and Electrochemical Cells

The video explores electrochemistry, focusing on galvanic and electrolytic cells. It explains how these cells convert chemical energy into electrical energy and vice versa. The video covers redox reactions, standard reduction potentials, and the spontaneity of reactions, providing insights into how batteries function.

What is the primary function of electrochemical cells?

• To convert mechanical energy into electrical energy

• To convert electrical energy into light energy

• To convert chemical energy into electrical energy

• To convert thermal energy into chemical energy

Which of the following is true about galvanic cells?

• They require external energy to operate

• They are non-spontaneous

• They convert electrical energy into chemical energy

• They generate electrical energy spontaneously

In a galvanic cell, what role does the salt bridge play?

• It acts as a catalyst

• It stores chemical energy

• It completes the electrical circuit

• It generates electrical energy

What does a positive standard reduction potential indicate?

• The reaction is spontaneous

• The reaction requires a catalyst

• The reaction is at equilibrium

• The reaction is non-spontaneous

How is the overall reduction potential of a galvanic cell calculated?

• By dividing the cathode potential by the anode potential

• By multiplying the potentials of the anode and cathode

• By subtracting the anode potential from the cathode potential

• By adding the potentials of the anode and cathode

What is a key characteristic of electrolytic cells?

• They are used in batteries

• They convert electrical energy into light energy

• They require external electrical energy

• They operate spontaneously

In an electrolytic cell, what happens to the flow of electrons compared to a galvanic cell?

• It doubles in speed

• It remains the same

• It is reversed

• It stops completely

What does a negative standard reduction potential suggest about a reaction?

• The reaction is spontaneous in the forward direction

• The reaction is non-spontaneous in the forward direction

• The reaction is at equilibrium

• The reaction requires a catalyst

Which element is a stronger reductant: lithium or hydrogen gas?

• Lithium

• Both are equally strong

• Neither is a reductant

• Hydrogen gas

What is the role of an oxidizing agent in a redox reaction?

• It donates electrons

• It acts as a catalyst

• It accepts electrons

• It remains unchanged