5 Electrochemistry

Question 1

What are the two basic types of electrochemical cells?

Answer 1

1. Galvanic cells

2. Electrolytic cells

Question 2

Describe the Electrochemical Cell Diagram using half cells.

Answer 2

Two different electrode (anode and cathode) submersed in electrolyte solution. An oxidation reaction (redox) occurs at the anode (loses electrons) and a reduction rxn occurs at the cathode and gains electrons. The salt bridge connects the two cells together and is a conductive path that completes the electrical circuit by allowing the migrating of ions.

Note:
Meter - attached to the electrodes to provide a reading

Potential develops as a result of the oxidation-reduction reactions taking place at the electrodes.
Flow of electrons results in current → energy

Question 3

What in the electrochemical cell diagram is saturated with electrolytes?

Answer 3

Filter paper forming the salt bridge that connects the two half cells together.

Question 4

What is an electrolytic cell?

Answer 4

Converts electrical energy (E) into chemical energy (E).

The redox reaction is not spontaneous (electrical energy has to be supplied). Both electrodes in one container with electrolyte solution acting as salt bridge.

Question 5

What is a galvanic cell?

Answer 5

Converts chemical energy (E) into electrical energy (E).

Redox reactions occur spontaneously between 2 different containers with a salt bridge.

Question 6

What are the charges of the anode and cathode terminals in a galvanic cell?

Answer 6

Anode is negative (ox)

Cathode is positive (red)

Question 7

What are the charges of the anode and cathode terminals in a electrolytic cell?

Answer 7

Anode is positive (ox)

Cathode is negative (red)

Question 8

Can a galvanic cell be built from an electrolytic cell?

Answer 8

Yes, with the energy turned off, products at the electrodes will spontaneously produce current in the opposite direction.