Write balanced equations for the electrode and overall cell reactions in the following galvanic cells. Sketch each cell, labeling the anode and cathode and showing the direction of electron and ion flow. (a) .

Key Concepts

Galvanic Cells

Galvanic cells, also known as voltaic cells, are electrochemical cells that convert chemical energy into electrical energy through spontaneous redox reactions. They consist of two half-cells, each containing an electrode and an electrolyte. The anode is where oxidation occurs, releasing electrons, while the cathode is where reduction takes place, accepting electrons. The flow of electrons from the anode to the cathode generates an electric current.

Oxidation and Reduction

Oxidation and reduction are fundamental concepts in redox reactions. Oxidation refers to the loss of electrons by a substance, resulting in an increase in oxidation state, while reduction is the gain of electrons, leading to a decrease in oxidation state. In a galvanic cell, the anode undergoes oxidation, and the cathode undergoes reduction. Understanding these processes is crucial for writing balanced half-reactions and overall cell reactions.

Balancing Redox Reactions

Balancing redox reactions involves ensuring that the number of atoms and the charge are equal on both sides of the equation. This can be achieved using the half-reaction method, where oxidation and reduction half-reactions are balanced separately before combining them. It is essential to account for electrons, ions, and any other species involved in the reaction. Properly balanced equations are vital for accurately representing the chemical processes occurring in galvanic cells.