NEET Chemistry Surface Chemistry Revision Notes

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Download NEET Chemistry Surface Chemistry Revision Notes in PDF format. All Revision notes for Full Course Surface Chemistry have been designed as per the latest syllabus and updated chapters given in your textbook for Surface Chemistry in Full Course. Our teachers have designed these concept notes for the benefit of Full Course students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Full Course Surface Chemistry for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Full Course Surface Chemistry given on studiestoday

Revision Notes for Full Course Surface Chemistry Surface Chemistry

Full Course Surface Chemistry students should refer to the following concepts and notes for Surface Chemistry in Full Course. These exam notes for Full Course Surface Chemistry will be very useful for upcoming class tests and examinations and help you to score good marks

Surface Chemistry Notes Full Course Surface Chemistry

 

Revision Notes on Surface Chemistry:
 
Adsorption
Reversible and irreversible adsorption
 
The adsorption is reversible, if the adsorbent can be easily removed from the surface of the adsorbent by physical methods. It is called irreversible adsorption, if the adsorbate cannot be removed from the surface of the adsorbent.
A gas adsorbed on a solid surface can be completely removed in vacuum. It is, therefore, reversible adsorption. Examples of irreversible adsorption are adsorption of oxygen on tungsten adsorbate and adsorption of CO on tungsten surface
 
Adsorbent, Adsorbate and Interface
 
• The substances upon whose surface the change of concentration occurs, is called absorbent.
• The substance taken up on the surface is call adsorbate.
• The common surface between the two phases where the adsorbed molecules concentrate is called the interface.

Physisorption and Chemosorption:

NEET Chemistry Surface Chemistry Revision Notes

 

Langmular Isotherm:
If A, B & AB represents the adsorbed, absorbent and the absorbed – adsorbent complex then,
A + B ↔AB
ka = Equilibrium constant for adsorption = [AB]/[A][B]
kd = Equilibrium constant for desorption = [A][B]/[AB]
K = Distribution coefficient = ka/kb
Θ = Fraction of the surface of adsorbent available for adsorption.
P = pressure
So,
Θ= KP/(1+KP) (Langmular Equation)
Freundlich Isotherm:
x= Mass of the gas adsorbed
m = Mass of absorbent
p = Pressure
K and n = constants
x/m =k.p(1/n) [n >1]
or
log x/m = log k + 1/n log P

NEET-Chemistry-Surface-Chemistry-Revision-Notes 1

Factors Affecting Adsorption:
• Temperature: An increase of temperature leads to a decrease in amount adsorbed and vice – versa.
• Pressure or concentration: It has been found that in most cases, the adsorption is reversible and an increased pressure of a gases vapour or an increase in concentration of a solute causes increased adsorption.
• Nature of Adsorbate and Adsorbent: The amount of the gas adsorbed depends upon the nature of adsorbent and the gas (adsorbate), which is to be adsorbed. It has been found that easily liquifiable gases such as NH3, HCl, Cl2 , SO2 CO2 etc. are more readily adsorbed than so the called permanent gases such as O2,N2, H2 etc. This is because that molecules of the former type of gases
have greater Vander waal’s or molecular force of attraction.
 
Colloids
Dispersed Phase:
The phase which is dispersed or scattered through the dispersion medium is called Dispersed phase or discontinuous phase.
Dispersion Medium:
The phase in which the scattering is done is called the dispersion medium or continuous medium.

NEET-Chemistry-Surface-Chemistry-Revision-Notes 2

Lyophobic and Lyophilic Colloids:
Those substance whose colloidal solution cannot be prepared by bringing them in contact with a solvent are called Lyophobic (disliking, fearing or hating a liquid). On the other hand those substances whose colloidal solutions can be prepared by bringing them in contact with a liquid solvent are called lyophilic colloids (loving a solvent).
 
Emulsions:
• Emulsion of oil in water: Those emulsions in which the dispersed phase is oil and water is the dispersion medium. These emulsion are generally represented as O in W emulsions. Examples are milk, vanishing cream etc.
• Emulsions of water in oil: Those emulsion in which the dispersed phase is water while oil is the dispersion medium. These emulsion are generally represented as W in O emulsions. Examples are butter, ice cream etc.

NEET-Chemistry-Surface-Chemistry-Revision-Notes 3

NEET-Chemistry-Surface-Chemistry-Revision-Notes 4

Bredig's method:
An electric arc is struck between two metallic electrodes immersed in dispersion medium. The arc produced vapourises the metal which on further condensation produces particles of colloidal size.
 
• Peptization:
Process of converting a precipitate into colloidal sol by shaking it with electrolyte in dispersion medium.
 
Hardy Schulze Rule:
• Ion carrying charge opposite to the colloidal particle has capacity to coagulate the colloid.
• Greater the valency of ion, greater will be the coagulating power.
• Gold Number: The minimum amount of lyophilic colloid in milligrams which can prevent the coagulation of 10 ml gold sol against 1 ml of 10% NaCl solution.
 
Surfactants
substances which gets preferentially adsorbed at the air – water and solid – water interfaces forming an oriented monolayer where the hydrophilic groups point towards the aqueous phase and the hydrocarbon chain point towards the air or towards the oil phase.
 
• Anionic surfactants : NSodium salts of higher fatty acids such as sodium palmitate (C15H31COONa), sodium stereate (C17H35COONa) and sodium Oleate (C17H33COONa).
•Catiuonic Surfactants: Those which dissociates in water to yield positively charged ions examples: C18H37 , C16H33(CH3)3 etc.
•Non ionogenic: Those whose molecules cannot undergo dissociation when an alcohol having a higher molecular weight reacts with several molecules of ethylene oxide, a non – ionogenic surfactant is produced.

 

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NEET Full Course Surface Chemistry Surface Chemistry Notes

We hope you liked the above notes for topic Surface Chemistry which has been designed as per the latest syllabus for Full Course Surface Chemistry released by NEET. Students of Full Course should download and practice the above notes for Full Course Surface Chemistry regularly. All revision notes have been designed for Surface Chemistry by referring to the most important topics which the students should learn to get better marks in examinations. Studiestoday is the best website for Full Course students to download all latest study material.

Notes for Surface Chemistry NEET Full Course Surface Chemistry

Our team of expert teachers have referred to the NCERT book for Full Course Surface Chemistry to design the Surface Chemistry Full Course notes. If you read the concepts and revision notes for one chapter daily, students will get higher marks in Full Course exams this year. Daily revision of Surface Chemistry course notes and related study material will help you to have a better understanding of all concepts and also clear all your doubts. You can download all Revision notes for Full Course Surface Chemistry also from www.studiestoday.com absolutely free of cost in Pdf format. After reading the notes which have been developed as per the latest books also refer to the NCERT solutions for Full Course Surface Chemistry provided by our teachers

Surface Chemistry Notes for Surface Chemistry NEET Full Course

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Surface Chemistry NEET Full Course Surface Chemistry Notes

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Notes for NEET Surface Chemistry Full Course Surface Chemistry

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