Question

A thick coating of plaster of Paris is applied over the bandage on a fracture bone.It becomes hard on drying to keep the fractured bone immobilized. Can the change in POP be reversed? Identify the change?

Answer 1

The change in POP can not be reversed hence it is a chemical change.

Step-by-step explanation:

Plaster of Paris (POP) is used to immobilize a fractured bone. The POP sets when water is added to it, it hardens irreversibly. Once it hardens, its shape can not be changed by any physical means. This means that the hardening of POP is a chemical change.

The chemical name of plaster of Paris is calcium sulfate hemihydrate. The setting of POP is an example of a chemical reaction.