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How does the crushing of chalk, a physical change as while crushing it everything is changed and a new type of substance is also formed so it should be a chemical change?
The crushing of chalk is a physical change as there is no molecular difference between the chalk and the crushed powdered chalk. So it is a physical change.
But this change is an Irreversible change as the powdered chalk cannot be converted back to its original size and shape.
Hence, the crushing of chalk is both, a physical and an irreversible change.
[Recapitulation:
Physical change is the change of that matter where only the appearance or molecular arrangement of matter changes without changing its composition. It is a temporary change and no new substance is formed. Most of the physical changes are reversible. The original form of the matter can be attained.
Examples: Boiling and freezing of water, melting of wax, mixing sand and grains, crumpling a paper bag, chopping a wood etc.
Irreversible change: This is a type of permanent change as the original form of the matter cannot be attained. Hence, it is known as irreversible change.]
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