What is the gas produced when lime is heated?
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When lime, which is also known as calcium oxide (CaO), is heated, it undergoes a chemical reaction and releases a gas called carbon dioxide (CO2).
To understand why carbon dioxide is produced when lime is heated, we need to examine the chemical composition of lime. Lime is made up of calcium (Ca) and oxygen (O) atoms, combined in a specific ratio. When heat is applied to lime, it causes the compound to break down, or decompose.
The chemical reaction can be represented as follows:
CaO (lime) + heat → Ca (calcium) + O (oxygen)
As a result of this reaction, calcium is separated from oxygen. The liberated oxygen atoms then combine with each other to form oxygen gas (O2), which is gaseous at room temperature. However, due to the high temperatures involved in heating lime, the liberated oxygen atoms readily combine with carbon present in the lime or the surrounding environment, forming carbon dioxide gas (CO2).
So, when lime is heated, it generates carbon dioxide gas as a byproduct.