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What is the most reliable indication that a chemical reaction has occurred?

Answer and explanation

Correct answer: Formation of new substances with properties different from those of the reactants

In a chemical reaction, reactants are converted into new substances with properties different from those of the reactants. Therefore, the formation of new substances with new properties is the most reliable indication of a chemical reaction. In contrast, changing position, shape, or container usually forms no new substance; these are physical changes.

Related tags

ScienceClass 10Chemical ReactionsChemical ChangePhysical Change

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