Question

1. Chemical changes are called permanent changes. Why?​

Answer 1

Permanent in nature. Since the original composition of the substance changes, one or more new substances are formed. ... A chemical change is generally irreversible. At least, it cannot be reversed by simple physical means.

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Answer 2

Answer:

There are two types of changes i.e. Physical and Chemical Change.

Physical changes are temporary changes because in physical changes, no new substance is formed .But in chemical changes, new substances are formed with all new properties . So Chemical changes are called permanent changes.