Question

Differentiate between Electrochemical cell and Electrolytic cell.

Hint:

The key difference is that electrochemical cells generate power (spontaneous), while electrolytic cells consume power to induce reactions (non-spontaneous).

Answer 1

Step 1: Electrochemical Cell.
An electrochemical cell is a device that converts chemical energy into electrical energy. It consists of two electrodes (anode and cathode) immersed in an electrolyte. The flow of electrons from the anode to the cathode through an external circuit produces electricity. - Spontaneous reaction: The reactions occurring in the electrochemical cell are spontaneous, meaning they occur naturally. - Example: Galvanic cell (e.g., Daniell cell).
Step 2: Electrolytic Cell.
An electrolytic cell is a device that converts electrical energy into chemical energy. In this cell, electrical energy is used to drive a non-spontaneous reaction, forcing ions to migrate and undergo chemical changes at the electrodes. - Non-spontaneous reaction: The reactions occurring in the electrolytic cell are non-spontaneous and require an external power source. - Example: Electrolysis of water.
Step 3: Key Differences.
- Function: Electrochemical cell generates electricity, while electrolytic cell requires electricity. - Reactions: Electrochemical cell involves spontaneous reactions, while electrolytic cell involves non-spontaneous reactions. - Energy Conversion: Electrochemical cell converts chemical energy to electrical energy, and electrolytic cell converts electrical energy to chemical energy.
Final Answer: An electrochemical cell generates electricity through spontaneous reactions, while an electrolytic cell uses electricity to drive non-spontaneous reactions.
Final Answer: \[ \boxed{\text{Electrochemical cells convert chemical energy to electrical energy, while electrolytic cells convert electrical energy to chemical energy.}} \]