Question

A change is irreversible if the materials involved in the change cannot be changed back to their original state and produces a new substance as a result of a/ an ___________ reaction. *

chemical
stirring
physical
eruption

Answer 1

Answer:

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Explanation:

A change which cannot be reversed to form the original substance (or substances) is called an irreversible change. If we burn a piece of paper, it changes into ash and smoke. Now we cannot combine the ash and smoke to form the original piece of paper.

Answer 2

Explanation:

chemical reaction

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