Question

A type of change in which we cannot get back the original substance

Answer 1

Answer:

irreversible change

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. So, the burning of paper is an irreversible change  which cannot be reversed.

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Answer 2

Answer:

A type of change whom which we can't reverse is called a irreversible change. For example bursting of cracker. You can't explode a firecracker which has already been exploded.