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All biological reactions are catalyzed by special catalyst called enzymes. Thus enzymes are defined as biological catalyst. Chemically all enzymes are globular proteins. However, some enzymes are also associated with some non protein component called the cofactor for their activity. These cofactors are of two ...

Zeolites are aluminosilicates i.e. three dimensional net work silicates in which some silicon atoms are replaced by aluminium atoms. They are found in nature as well as synthesized in the laboratory. They form an important class of oxide catalyst. Zeolites to be used as a ...

Homogeneous catalyst: If the catalyst is present in the same phase as the reactants, it is called a homogeneous catalyst and this type of catalyst is called homogeneous catalysis. Heterogeneous catalyst: If the catalyst is present in a different phase as the reactants, it is called a heterogeneous ...

Catalyst is a substance which can change the speed of a chemical reaction without being used up in that reaction and the phenomenon is known as catalysis. Catalyst is divided into two types: Positive catalyst: If a catalyst increases the speed of a reaction, it is ...

The colloidal system constituting the liquid as the dispersed phase and the solid as the dispersion medium is known as gel. There are some sols that have a high concentration of dispersed solid and change spontaneously into semi solid form on cooling. These are known ...

Colloids play a very significant role in nature and in our daily life. Some of the important applications of colloids are discussed below: 1) Medicines: Medicines in colloidal form are easily adsorbed by the body tissues and hence are more effective. 2) Sewage disposal: Colloidal particles of the dirt, mud etc. ...

Applications of emulsions: Emulsions are useful in a number of ways. Some of the applications are discussed below: a) In the metallurgical processes, the concentration of ore by forth floatation process is based upon the treatment of the powdered ore with oil emulsion. The valuable particles of ...

Various methods of emulsions to test the type of emulsion are as follows: a) Microscopic methods: To a small amount of the given emulsion, a few drops of water are added. The water will mix completely if the emulsion is oil-in-water type. Similarly for the water-in-oil emulsions, the ...

An emulsion is colloidal dispersion in which both the dispersed phase and the dispersion medium are liquids. The two well known examples of emulsions are: 1) Milk in which the particles of the liquid fat are dispersed in water. 2) Cod liver oil emulsion in which water is dispersed in ...

Lyophobic sols are unstable and are easily precipitated by the addition of electrolytes. However it is observed that the addition of certain lyophilic colloids like gums, soaps, gelatin etc. To lyophobic colloids render lyophobic colloids difficult to coagulate by the addition of electrolytes. The process ...

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