CBSE Class 12 Chemistry Surface Chemistry Notes

CBSE Class 12 Chemistry Surface Chemistry Notes. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

Introduction:chemistry deals with phenomena that occur at the surfaces or interfaces. Many important phenomena, noticeable amongst these being corrosion, electrode processes, heterogeneous catalysis, dissolution and crystallization occur at interfaces. The subject of surface chemistry finds many applications in industry, analytical work and daily life situations. In this Unit, you will be studying some important features of surface chemistry such as adsorption, catalysis and colloids including emulsions and gels.

Adsorption: The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed adsorption. The substance, which accumulates at the surface, is termed adsorbate and the material on the surface of which the adsorption takes place is called adsorbent.

Application of Adsorption:

(i) Production of high vacuum.

(ii) Gas masks

(iii) Control of humidity:

(iv) Removal of colouring matter from solutions

(v) Heterogeneous catalysis

(vi) Separation of inert gases

(vii) In curing diseases

(viii) Froth floatation process

(ix) Adsorption indicators

(x) Chromatographic analysis

Desorption: The process of removing an adsorbed substance from a surface on which it is adsorbed is called desorption.

Distinction between Adsorption and Absorption-

In adsorption, the substance is concentrated only at the surface and does not penetrate through the surface to the bulk of the adsorbent, while in absorption, the substance is uniformly distributed throughout the bulk of the solid.

Mechanism of Adsorption:

1.the molecules present at the surface of adsorbent possess unbalanced or residual attractive forces. These forces of the adsorbent are responsible for attracting the adsorbate particles on its surface. The mextent of adsorption increases with the increase of surface area per unit mass of the  dsorbent at a given temperature and pressure.

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