Galvanic Cells
Chapter Name : Electrochemistry |
Sub Topic Code : 102_12_03_03_01 |
Topic Name : Galvanic Cells |
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Sub Topic Name : Galvanic Cells |
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Introduction
• An electrochemical cell consists of two electrodes: anode and cathode. The electrolyte solutions containing these electrodes are called half cells. When the two half cells are combined, a cell is formed. • In an electrochemical cell, electrons flow from anode to cathode and current from cathode to electrode. • Due to difference in charge on the metal rods and the solution, a potential difference exists, which is called the electrode potential. . .
Pre-Requisites:
• Redox reactions
Activity:
Electrical batteries.
Real Life Question:
How do the electrochemical cells convert chemical energy into electrical energy?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Electrochemical or galvanic cell | A device in which chemical energy released during a chemical reaction is converted into electrical energy. |
| Electrodes | Metallic rods dipped in the electrolyte solution. |
| Anode | It is a positively charged electrode, where electrons are released or oxidation occurs. |
| Cathode | It is a negatively charged electrode, where electrons are accepted or reduction occurs. |
| Half cells | The two containers involving oxidation and reduction half reactions are called Half cells. |
| Electrode potential | The potential difference between the metal rod and its ion in solution due to difference in charge. |
| Oxidation potential | The potential of an electrode where oxidation takes place. |
| Reduction potential | The potential of an electrode where reduction takes place. |
| Cell potential | The potential difference between the two electrodes of a galvanic cell. |
| Standard electrode potential | If the electrode is suspended in a solution of 1 molar concentration at 298 K, the electrode potential is called as standard electrode potential. |
| Electromotive force | When no current is drawn through the cell, cell potential is called as electromotive force. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Battery | Batteries used in torches, cameras, watches consist of galvanic cells. |
Real life uses :
As dry cells, mercury cells, rechargeable Ni-Cd batteries, and lead storage cells.
Places to visit :
Home.
Practical examples around us
| Examples | Explainations |
|---|---|
| Home | Electrical batteries used in torches, watches are made of galvanic cells. |
What you learn in Theory:
Working of electrochemical cell.