Ice melting is an example of an endothermic reaction because it absorbs heat.
When ice melts spontaneously, there is a physical shift. But if you employ a reactant, like salt, to hasten the process, it becomes a chemical reaction. While exothermic reactions emit heat, endothermic reactions absorb it. A example endothermic process is ice melting.
Since there is no chemical change occurring to the ice as it melts, ice melting is not a chemical reaction. The water molecules remain unchanged and continue to be water molecules.
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