Why it is necessary to add gypsum in the final stages of preparation of cement?

A soap molecule has two parts namely hydrophobic and hydrophilic. With the help of these, it attaches to the grease or dirt particle and forms a cluster called micelle. These...

Warm-blooded animals such as birds and mammals maintain a constant body temperature by cooling themselves when they are in a hotter environment and by warming their bodies when they are...

Because the half cell containing single electrode cannot exist independently, as charge cannot ow on its own in a single electrode. 

Because it forms a dense fog of sulphuric acid which does not condense easily.

For delegation to be effective it is necessary that responsibility is accompanied with authority. Responsibility refers to the obligation to complete a task which has been assigned by the superior....

Due to water, cement hardens and its composition changes. Since it is a chemical change which cannot be reversed.

(a) Hardening of cement

The important raw materials used in the manufacturing of cement are: limestone, silica, alumina and gypsum. Apart from these, coal, electric power and rail transportation are also needed.

The chemical formula of Gypsum: CaSO4.2H2O When gypsum is heated at 373k, we get plaster of Paris Chemical equation:                             ...

(b) : Water develops interlocking needlelike crystals of hydrated silicates. The reactions involved are the hydration of calcium aluminates and calcium silicates which change into their colloidal gels. At the...