what is cao in chemistry

Calcium oxide (CaO) is a chemical compound that is commonly known as quicklime or burnt lime. It is a white, caustic, alkaline, crystalline solid at room temperature. Calcium oxide is an inorganic compound that is used in various industries, including mining, light, petroleum, chemical, and construction, among others. It is usually made by the thermal decomposition of materials, such as limestone or seashells, that contain calcium carbonate (CaCO3) in a lime kiln. This is accomplished by heating the material to above 825 °C (1,517 °F), a process called calcination or lime-burning, to liberate a molecule of carbon dioxide (CO2), leaving quicklime behind. Calcium oxide is an ionic compound featuring an ionic bond between calcium and oxygen. It is basic in nature and forms salts when it comes in contact with an acid. Calcium oxide is used in various applications, including as a property modifier component in glass composition.