Thermal Decomposition...**":;

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Thermal decomposition is a form of chemical decomposition CAUSED by HEAT. It is also known as thermolysis. The temperature at which the decomposition initiates is known as decomposition temperature. It is a multi-step process.

Decomposition involves the breakdown of chemical bonds. In order to break a chemical bond, energy should be given from outside. Therefore, a thermal decomposition is usually an endothermic reaction.The most common example for substances that undergo thermal decomposition is TRANSITION metal carbonates.

Example of Thermal Decomposition..**";:

Calcium carbonate (CaCO3) decomposes into calcium oxide (CaO) and carbon dioxide (CO2) when heat is provided.

CaCO3(s)→CaO(s) + CO2(g)

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THERMAL DISSOCIATION..**";:'

Thermal dissociation is the ionization of a substance using heat. The substance is separated into cationic and anionic counterparts. It is a single step process that includes the split of a substance into TWO parts. This reaction is usually a reversible process and one chemical bond is broken.

The original COMPOUND can be obtained by cooling the reaction mixture since the process is reversible.

Example...

CH3Br → CH3++ Br–

CH3-CH3 →CH3+ + CH3–

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