Question

Q15.A white powdery substance X immediately sets into a hard
mass on adding a liquid Y to it. In hospitals , a thick coat of the
paste of substance X is applied over the bandage on the fractured
bone of a patient to keep the fractured bone in place to get joined
properly.
a) What could the substance X be?
b) Name the liquid Y.
c) What type of change occurs in X on adding Y?​

Answer 1

Answer:

A. Substance X is Calcium sulphate hemihydrate(Plaster of paris).

B. Liquid Y is Water

C. The substance immediately sets up after some time on mixing liquid Y with substance X.

Answer 2

The answers to the following parts are as follows:

a) The substance X can be calcium sulfate hemihydrate or commonly known as Plaster of Paris.

b) The liquid Y that turns X into a hard substance then, Y is water.

c) Chemical irreversible change occurs when X and Y are combined.

About Plaster of Paris(POP):

• Plaster is a material used in construction that may be molded and cast to create decorative components as well as utilized as a protective or decorative coating for walls and ceilings.
• In English, "plaster" typically refers to a substance used for inside purposes, whereas "render" frequently alludes to exterior uses.
• Another ambiguous term for the substance is stucco, which is frequently applied to plasterwork that has been manipulated in some way to create relief embellishment as opposed to flat surfaces.
• Plaster of Paris is kept in moisture-proof containers since exposure to moisture can cause the material to hydrate, slow down the setting process, and eventually render it worthless.

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