Question

Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?

Answer 1

Hint: Heating any substance can cause it to decompose or be transformed into ions of its constituent atoms. Thermal decomposition is a type of chemical decomposition that occurs when heat is applied. Thermolysis is another name for it. Compounds decompose during thermal decomposition to produce two or more products from a single reactant. When calcium carbonate is heated, it decomposes into calcium oxide and carbon dioxide gas.

Complete answer:
Thermal dissociation is the breaking down of a chemical into smaller compounds or components by the action of heat, which then recombine to form the original compound in the absence of heat. As a result, thermal dissociation is a sort of thermal degradation that is reversible in nature.

THERMAL DISSOCIATION	THERMAL DECOMPOSITION
It is a chemical process in which heat is used to break down molecules into cation and anion ions, but the reaction is reversible.	It is a type of chemical degradation that occurs as a result of heat.
Thermodynamic dissociation is a one-step procedure.	The process of thermal breakdown is multi-step.
In nature, it is usually reversible since the compounds generated during dissociation react again to produce reactants. When the reaction mixture containing the products cools, this happens.	It could be either reversible or irreversible. On cooling, products may or may not react to generate reactants.

Note:
Examples-
Zinc carbonate decomposes into zinc oxide and carbon dioxide when heated. The molecule decomposes into two simple components, zinc oxide and carbon dioxide, in this example of heat breakdown.
\[ZnC{O_3} \to ZnO + C{O_2}\]
When heated, ammonium chloride dissociates into ammonia and hydrogen chloride. The following is a chemical reaction for the same.
\[N{H_4}Cl \rightleftharpoons N{H_3} + HCl\]
When ammonium chloride is heated, two chemicals are formed: \[\left[ {N{H_3}} \right]\] and \[\left[ {HCl} \right]\]. On cooling, this reaction mixture comprising \[\left[ {N{H_3}} \right]\] and \[\left[ {HCl} \right]\] reacts to generate \[\left[ {N{H_4}Cl} \right]\]. Thermal breakdown happens here, however due to the reversible nature of the chemical process, it is classified as thermal dissociation.