oxide
O²⁻
An oxide is a chemical compound made up of oxygen and one or more other elements. The most common example of an oxide is water, which is composed of two hydrogen atoms and one oxygen atom (H2O). Other common examples of oxides include carbon dioxide (CO2), iron oxide (FeO), and aluminum oxide (Al2O3).
Oxides can be classified as acidic, basic or amphoteric, depending on their properties. Acidic oxides, such as sulfur dioxide (SO2), produce acid when they react with water. Basic oxides, such as calcium oxide (CaO), react with acids to form salts and water. Amphoteric oxides, such as aluminum oxide, can react with both acids and bases.
Oxides play important roles in many different fields. For example, in industry, oxides are used in the production of metals, ceramics and glass. In the atmosphere, oxides contribute to air pollution and the formation of acid rain. In the body, oxides play important roles in biological functions, such as cell signaling and oxygen transport.
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