* Ionic Dissociation: Ammonium chloride is an ionic compound. When it dissolves in water, it undergoes ionic dissociation, where the ammonium ions (NH₄⁺) and chloride ions (Cl⁻) separate from each other.
* Formation of New Entities: The separated ions are now surrounded by water molecules, forming hydrated ions. These hydrated ions are distinct from the original ammonium chloride compound.
* Heat Change: The dissolving process is endothermic, meaning it absorbs heat from the surroundings. This indicates a change in the chemical bonds and energy levels of the system.
In summary: While dissolving ammonium chloride in water might seem like a physical change because you're just mixing substances, the chemical process of ionic dissociation and formation of new entities makes it a chemical change.
