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|Systematic name||Calcium oxide|
|Molar mass||56.0774 g·mol|
|Appearance||White chunky powder|
|Melting point||4,662°F (2,572°C)|
|Boiling point||5,162°F (2,850°C)|
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)|
Calcium oxide is a chemical compound of calcium and oxygen. Its chemical formula is CaO. It is known as quicklime. It is made in a lime kiln. It releases heat when dissolved in water and changes into calcium hydroxide. It is a white powder.