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Why is melting of ice not a chemical reaction?

Answer and explanation

Correct answer: Because no new substance is formed

When ice melts, only its physical state changes from solid to liquid. Its chemical composition remains
$
\mathrm{H_2O}$

, so no new substance is formed. Therefore, melting is a physical change, not a chemical reaction. Gas evolution or precipitate formation can be signs of some chemical reactions, but neither occurs when ice melts.

Related tags

ScienceChemical ReactionsPhysical ChangeMeltingStates Of Matter

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