SURFACE CHEMISTRY PDF
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. Surface Chemistry is the branch of chemistry which deals with the at the surface is termed as adsorbate and the material on the surface of which the. Surface Chemistry Class 12 Inorganic Formulas Notes Pdf Download. POINTS TO REMEMBER. Adsorption: The accumulation of molecular species at the.
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Free PDF download of Class 12 Chemistry revision notes & short key-notes for Chapter 5 - Surface Chemistry to score high marks in exams, prepared by expert . standard and overall coverage of colloid and surface chemistry intermediate between physical chemistry and the comprehensive accounts found in special- . Surface Chemistry and Catalysis. Michalis Konsolakis. School of Production Engineering and Management, Technical University of Crete.
Chapter 2 - Solutions. Chapter 3 - Electrochemistry. Chapter 4 - Chemical Kinetics. Chapter 7 - The p-Block Elements. Chapter 8 - The d and f Block Elements. Chapter 9 - Coordination Compounds. Chapter 10 - Haloalkanes and Haloarenes. Chapter 11 - Alcohols, Phenols and Ethers. Chapter 12 - Aldehydes, Ketones and Carboxylic Acids. Chapter 13 - Amines.
Chapter 14 - Biomolecules. Chapter 15 - Polymers.
Class 12 Chemistry Revision Notes for Chapter 5 - Surface Chemistry
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Class 11th. Class 10th. The Solid State. The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid. The molecular species or substance, which concentrate at the surface.
The material on the surface of which the adsorption takes place. Adsorption is essentially a surface phenomenon. The process of removing an adsorbed substance from a surface on which it is adsorbed. The extent of adsorption increases with the increase of surface area per unit mass of the adsorbent at a give temperature and pressure. Easily liquefiable gases i.
Empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature. Catalysts - Substances, which alter the rate of a chemical reaction andthemselves remain chemically and quantitatively unchanged after the reaction. Promoters - Substances that enhance the activity of a catalyst. The catalytic process in which the reactants and the catalyst are in different phases. The activity of a catalyst depends upon the strength of chemisorptions to a large extent.
The reactants must get adsorbed reasonably strongly on to the catalyst but not so strongly to become active. The selectivity of a catalyst is its ability to direct a reaction to yield a particular product. Shape-selective catalysis: The catalytic reaction that depends upon the pore structure of the catalyst and the size of the reactant.
Zeolites are good shape-selective catalysts. The enzymes are biochemical catalysts. The invertase enzyme converts cane sugar into glucose and fructose.
A colloid is a heterogeneous system in which one substance is dispersed dispersed phase as very fine particles in another substance called dispersion medium. Range of diameters is between 1 and nm. Catalyst: These are substances which alter the rate of a chemical reaction and themselves remain chemically and quantitatively unchanged after the reactionand the phenomenon is known as catalysis. Promoters: These are the substances which increase the activity of catalyst. Catalytic poisons Inhibitors : These are the substances which decrease the activity of catalyst.
Heterogeneous catalysis: When the catalyst and the reactants are in different phases, the catalytic process is said to be heterogeneous catalysis.
Activity of catalyst: It is the ability of a catalyst to increase the rate of a chemical reaction. Selectivity of catalyst: It is the ability of catalyst to direct a reaction to yield a particular product excluding others. Example — Zeolites are shape — selective catalysts due to their honey- comb structure.
Enzymes: These are complex nitrogenous organic compounds which are produced by living plants and animals. They are actually protein molecules of high molecular mass.
They are biochemical catalysts Steps of enzyme catalysis: i Binding of enzyme to substrate to form an activated complex. Characteristics of enzyme catalysis: i They are highly efficient. One molecule of an enzyme can transform molecules of reactants per minute.
Example — Urease catalysis hydrolysis of urea only. The rate of enzyme catalysed reaction becomes maximum at a definite temperature called the optimum temperature.
They weakly bind to enzyme and increase its activity.Higher the critical temperature of gas, more will be the extent of adsorption. Catalyst: These are substances which alter the rate of a chemical reaction and themselves remain chemically and quantitatively unchanged after the reactionand the phenomenon is known as catalysis.
NCERT Class XII Chemistry: Chapter 5 – Surface Chemistry
It is irreversible. The process of removing an adsorbed substance from a surface on which it is adsorbed. Caused due to a addition of electrolytes b electrophoresis c boiling d mixing two oppositely charged sols. Question Papers.
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