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A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?



A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?


Grade:11

9 Answers

Aditi Chauhan
askIITians Faculty 396 Points
10 years ago

When water is added to plaster of Paris (POP), it changes to another substance and on drying it hardens. Once the POP has hardened, its shape cannot be changed. Therefore, the change in POP cannot be reversed.

Adarsh
733 Points
8 years ago
This is an example of chemical change which cannot be reversed by using simple physical means. However, this change can be reversed using some chemical means.
Arya
13 Points
5 years ago
No, the change in the POP cannot be reverse.it is a chemical change and it can not be reversed because after it became hard it became a solid
Sarvesh
14 Points
5 years ago
This is an example of chemical change.  It can't be reversed using physical means. You have to either heat the plaster or do some other complex processes.
Scholr Boy
87 Points
5 years ago
2CaSO4.H2O + 3H2O = 2CaSO4.2H2O
This is a irreversible chemical change. Hence POP cannot be reverted back after it becomes hard
Pavitra
16 Points
5 years ago
A news for you about the structure of the earth  hatts off to magellon to find the earth is round  after a great struggle he has found 
Adi
13 Points
5 years ago
  1. No, the change cannot be reversed pop has a property of setting into a hard masses on wetting with water due to the formation of a new compound called gypsum . once the pop is hardened, it cannot be reversed back to pop .tense ,it is an in reversible change
Aditya kakkar
13 Points
5 years ago
NO, THE CHANGE IN P.O.P CANNOT BE REVERSED AS IT BECOME HARD ON DRYING AND A NEW SUBSTANCE IS FORMED WHICH CANNOT BE REVERSED BACK IN IT'S ORIGINAL FORM.THEREFORE, CHANGE IN THE P.O.P CANNOT BE REVERSED AND IT IS A CHEMICAL CHANGE.
Arun
25750 Points
3 years ago
A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. ... No, the change in plaster of Paris cannot be reversed. When water is added to POP, it undergoes a chemical change

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