What are the physical properties of plaster of Paris?
PLASTER OF PARIS is non-flammable and non-combustible. Has generally low chemical reactivity but can act as an oxidizing agent under extreme conditions. Decomposes at high temperature to generate toxic oxides of sulfur. Reacts exothermically but slowly with moisture in the air or water to form gypsum CaSO4.
What are the properties of Plaster of Paris Class 10?
Properties of Plaster of Paris
(1) It is a white powder. (2) It has a very remarkable property of setting into a hard mass on wetting with water. P.O.P. should be stored in a moisture proof container.
What is plaster of Paris write its two properties?
It is a white powder. When mixed with water (1/3 of its mass), it evolves heat and quickly sets to a hard porous mass within 5 to 15 minutes. During setting, a slight expansion (about 1%) in volume occurs so that it fills the mould completely and takes a sharp impression.
Which of the following is plaster of Paris?
Calcium sulphate with half a molecule of water per molecule of the salt (hemi-hydrate) is called plaster of paris (plaster of paris).
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 properties of plaster?
Freshly mixed plaster should have good adhesion and cohesion characteristics and should remain workable long enough to obtain the desired surface. Hardened plaster should be weather resistant, durable, and should provide the specified appearance criteria (color and texture).
Which property of Plaster of Paris is used in plastering of fractured bones?
Plaster of Paris has a very remarkable property of setting into a hard mass on wetting with water ‘ is the property of POP which is utilised for make cast for broken limbs in hospitals.
What is plaster of Paris Class 11 Ncert?
CBSE NCERT Notes Class 11 Chemistry The S Block Elements. 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. It forms a plastic mass on addition of water which further gets hardened within 5-15 minutes.
What is plaster of Paris write two properties and two uses?
Uses of plaster of paris:-
Used as the cement in ornamental casting and for making decorative materials. Used as a fireproofing material and for making chalks. Used in hospitals for immobilizing the affected part in case of bone fracture or sprain. Used to fill small gaps on walls & roofs.
What are pop properties?
Persistent organic pollutants (pops)
POPs are synthetic chemicals with the following properties: They are toxic and can have adverse effects on human health and animals. They are chemically stable and do not readily degrade in the environment. They are lipophillic (have an affinity for fats) and easily soluble in fat.