Question

tearing of paper is said to be a change that cannot be reversed.
Is this statement true or false.

Answer 1

Tearing of a paper is a physical change because when the paper is torn only the appearance of the paper is changed and no new substance is formed. Since this is a physical change this change can also be reversed. So the above statement is false



But Burning of paper is a chemical change when paper is burnt the chemical composition of the paper is changed at the molecular level. Subsequently the paper is turned into ash this chemical change is am irreversible change. Hence compared burning of paper is a chemical change and tearing of paper is physical change.