What are thermal decomposition reactions? Explain with an example.

Thermal decomposition reactions refer to chemical reactions in which a compound breaks down into simpler substances when exposed to heat. These reactions are initiated by the absorption of thermal energy, which provides the activation energy required for the decomposition to occur. The products of thermal decomposition reactions are typically different from the original compound.

Here's an example of a thermal decomposition reaction:

Calcium carbonate (CaCO₃) is a compound commonly found in limestone and marble. When it is heated, it undergoes thermal decomposition to produce calcium oxide (CaO) and carbon dioxide (CO₂).

The balanced chemical equation for this reaction is:

CaCO₃ (s) → CaO (s) + CO₂ (g)

In this reaction, the heat energy breaks the bonds within the calcium carbonate crystal structure, leading to the formation of calcium oxide and carbon dioxide. Calcium oxide is a white solid, commonly known as quicklime, and carbon dioxide is a gas. This decomposition reaction is commonly used in industries such as cement production, where limestone is heated to obtain calcium oxide, an important component of cement.

It's important to note that thermal decomposition reactions can vary depending on the compound involved. Different compounds will decompose at different temperatures and produce different products. The rate and extent of the reaction also depend on factors such as temperature, pressure, and the presence of catalysts.