Electrochemistry

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A series of free High School Chemistry Video Lessons.

In this lesson, we will learn

• Chemistry Corrosion
• Electrolysis
• Oxidation Number Method

Chemistry Corrosion
Chemistry corrosion occurs as the result of the oxidation of a metal. It is the process of returning metals to their natural state which is ore. Most metals develop a thin oxide coating that protects internal atoms. The protective coating is often applied to protect the metal from oxygen and moisture.
A quick video showing how rust is formed by the redox reaction between iron and hydrogen and oxygen.
A brief explanation of Oxidization and Reduction effects on iron. Electrolysis
Electrolysis is a process in which electrical energy is used to produce a chemical change that would not otherwise occur. First, an electric current is produced from a chemical using a oxidation-reduction reaction. Then this electric current is used to produce a chemical change. An example of electrolysis is hydrolysis, or the splitting of water into hydrogen and oxygen.
Understanding how electrical energy produces chemical changes. The basic Water Electrolysis example

Oxidation Number Method
The oxidation number method, also called oxidation states, keeps track of electrons gained when a substance is reduced and the electrons lost when a substance is oxidized. Each atom in a neutral molecule or charged species is assigned an oxidation number. When there is an increase in the oxidation number, oxidation occurs. When there is a decrease in the oxidation number, reduction occurs. The sum of all the oxidation numbers in a compound is equal to its overall charge.
How to use the oxidation number method to understand oxidation-reduction reactions.
how to use the oxidation number method to balance Redox reactions under acidic or basic conditions.