Question

But the paper can not join again so why it is physical changes

Answer 1

Answer:

When a paper is torn, the size and the shape of the paper changes, but the molecules of the paper remains the same. Since, no new molecules are formed, tearing paper is a physical change. At the same time, we cannot get back the sheet of paper from the pieces. Thus, the physical change is irreversible

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Answer 2

Explanation:

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