What are the uses of plaster of Paris Class 9?

What are the properties and uses of plaster of Paris?

(i) It is used for plastering fractured bones and dislocated bones so as to set them in proper place. (ii) It is used in making toys, decorative materials. (iii) It is used in making casts for statues, toys, surgical instruments, etc. (iv) It is used in making blackboard chalks.

What are the two important uses of plaster of Paris chemically?

This is prepared by heating gypsum to 120–130°C. Uses of plaster of Paris: (i) It is used in making chalks and fire proof materials. (ii) Used for making patient plasters used in surgery and for plastering fractured parts of the body.

What is plaster of Paris Ncert?

The chemical name of Plaster of Paris is Calcium Sulphate (CaSO4·½ H2O)). It is obtained by heating the gypsum, CaSO4·2H2O, to 393 K. 2(CaSO4·2H2O) –> 2(CaSO4).H2O + 3H2O. It forms a plastic mass on addition of water which further gets hardened within 5-15 minutes.

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What are the uses of plaster of Paris Class 10?

– Plaster of Paris is used in filling cracks in walls and gaps. – It is stable at high temperatures, so it is used as fireproofing material. – Plaster of Paris is used in preparing mould, statues and artificial decorative items. – Plaster of Paris is used to make the cast that is used in case of bone fracturing.

What is plaster paris example?

An example of plaster of Paris is one of the materials used to create a cast for a broken arm. A heavy white powder, calcined gypsum, which, when mixed with water, forms a thick paste that sets quickly: used for casts, moldings, statuary, etc. A form of calcium phosphate derived from gypsum.

How is plaster of Paris prepared write two properties and two uses?

plaster of paris is prepared by heating gypsum (CaSO4. 2H2O) at 120°C in rotary kilns, where it gets partially dehydrated. The temperature should be kept below 140°C otherwise further dehydration will take place and the setting property of the plaster will be partially reduced.

What is plaster of Paris chemically how is it prepared list its two important uses class 10?

Calcium sulphate with half a molecule of water per molecule of the salt (hemi-hydrate) is called plaster of paris (plaster of paris). It is prepared by heating gypsum (CaSO4. 2H2O) at 120°C in rotary kilns, where it gets partially dehydrated.

What is plaster of Paris how it is prepared Class 10?

Plaster of Paris is prepared by heating gypsum at 373 K. On heating, it loses water molecules and becomes calcium sulphate hemihydrate (CaSO4. 1/2 H2O) which is called Plaster of Paris.

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What is plaster of Paris How is it obtained?

Plaster of Paris is obtained by heating gypsum or calcium sulphate dihydrate to about 140-180 degree Celsius. When heated to such a temperature, gypsum forms Plaster of Paris. The name is derived from the large deposits of gypsum in the Montmartre hill in Paris.