FIITJEE Chemistry

 Surface chemistry name of the chapter:  Surface chemistry  Content Provider: FIITJEE Lecturer from FIITJEE Introduction based on NCERT : Surface chemistry deals with phenomena that occur at the surfaces or interfaces. The interface or surface is represented by separating the bulk phases by a hyphen or a slash. For example, the interface between a solid and gas may be represented by solid-gas or solid/gas. Due to complete miscibility, there is no interface between the gases. The bulk phases that we come across in surface chemistry may be pure compounds or solutions. The interface is normally a few molecules thick but its area depends on the size of the particles of bulk phases. Many important phenomena, noticeable amongst these being corrosions, 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. To a...

 Solid states  name of the chapter:  Solid State Content Provider: FIITJEE Lecturer from FIITJEE Introduction given by NcertText book:  We are mostly surrounded by solids and we use them more often than liquids and gases. For different applications, we need solids with widely different properties. These properties depend upon the nature of constituent particles and the binding forces operating between them. Therefore, the study of the structure of solids is important. The correlation between structure and properties helps in discovering new solid materials with desired properties like high-temperature superconductors, magnetic materials, biodegradable polymers for packaging, biocompliant solids for surgical implants, etc. From our earlier studies, we know that liquids and gases are called fluids because of their ability to flow. The fluidity in both of these states is due to the fact that the molecules are free to move about. On the contrary, the constitu...