Question

Mention 2 irreversible physical changes explain why even though they are irreversible

Answer 1

cutting of paper : a paper sheet has been cut into pieces cannot be put back together to get original form
making a dress from fabric: a fabric can to be reversed to its original shape once it is made into a dress

Answer 2

1) Tearing of paper - Tearing of paper is a physical change as it doesn't affect the chemical composition of the paper but it causes change in its shape and size. And also, it is an irreversible change as we cannot get the big piece of paper back or join the pieces to make it the original paper again.

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 2) Carving statue out of wood - Wood carving is an irreversible physical change. When a statue is carved out of wood, the physical properties of the wood i.e. -shape, size etc. change but its chemical composition remains the same. It has the same chemical properties as it had earlier. But it is an irreversible change because we cannot get the original piece of wood again. The change cannot be reversed. 

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