Transcription of Surface Chemistry - NCERT
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Surface Chemistry - NCERT
Surface Chemistry deals with phenomena that occurat the surfaces or interfaces. The interface or surfaceis represented by separating the bulk phases by ahyphen or a slash. For example, the interface betweena solid and a gas may be represented by solid-gasor solid/gas. Due to complete miscibility, there is nointerface between the gases. The bulk phases thatwe come across in Surface Chemistry may be purecompounds or solutions. The interface is normally afew molecules thick but its area depends on the sizeof the particles of bulk phases. Many importantphenomena, noticeable amongst these beingcorrosion, electrode processes, heterogeneouscatalysis, dissolution and crystallisation occur atinterfaces. The subject of Surface Chemistry findsmany applications in industry, analytical work anddaily life accomplish Surface studies meticulously, itbecomes imperative to have a really clean very high vacuum of the order of 10 8 to 10 9pascal, it is now possible to obtain ultra clean surfaceof the metals.
adsorbed by the charcoal. (iv) The air becomes dry in the presence of silica gel because the water molecules get adsorbed on the surface of the gel. It is clear from the above examples that solid surfaces can hold the gas or liquid molecules by virtue of adsorption. The process of removing an adsorbed substance from a surface on which it is
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