Question

define the terms physical and chemical change ​

Answer 1

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${\red{\huge{\bf{Physical change}}}}$

The change in which the substance formed can be brought back to its old form.

${\blue{\huge{\bf{Chemical change}}}}$

The change in which the substance formed cannot be changed to older form.

Answer 2

Physical Change=> Those changes which bring only change in the physical nature of a matter.
Chemical Change=>Those changes which bring change in the chemical properties of a matter.