The heat of decomposition refers to the heat of reaction that occurs when the molecules of a compound break down into smaller molecules, fragments, or atoms. Thermal decomposition, conventionally, means the breaking down of chemical bonds in molecules under the influence of heat, resulting in the production of smaller molecules or atoms. The weaker the chemical bond in a molecule, the lower the temperature at which thermal decomposition occurs.
For chemical compounds, there are generally two types of thermal decomposition reactions:
Since heat is required to break the chemical bonds in the decomposing compound, the reaction is usually endothermic, meaning they absorb heat from the environment during the reaction. If the decomposition is sufficiently exothermic, that is, a reaction that releases heat, a positive feedback loop occurs, producing thermal runaway and possibly an explosion or other chemical reaction.
Meanwhile, thermal decomposition occurs reversibly or may be irreversible, depending on the chemical properties of the substances.
Typical reactions involving chemical weathering processes are generally chemical weathering involving the formation of both solid and gaseous phases from a single solid phase.
Because metals are near the bottom of the reactivity series, their compounds generally decompose easily at high temperatures. This is because stronger bonds form between atoms towards the top of the reactivity series, and these strong bonds are not easily broken. For example, copper is near the bottom of the reactivity series, and copper sulfate begins to decompose at around 200 degrees Celsius. In contrast, potassium is near the top of the reactivity series, and potassium sulfate does not decompose even at its melting point of approximately 1070 degrees Celsius, or even at its boiling point.
In short, thermal means heat. Decomposition is the process of fragmentation. Thermal decomposition is a chemical reaction that occurs when a compound decomposes when heated. Thermal decomposition reactions take place at high temperatures. The reactants absorb a lot of energy before they decompose. Thermal decomposition are examples of endothermic reactions.
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