Laws Electrochemistry Ncert Pdf


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Electrochemistry is the study of production of electricity from energy released during spontaneous chemical reactions and the use of electrical energy to bring. - No.1 online tutoring company in India provides you Free PDF download of NCERT Solutions for Class 12 Chemistry Chapter 3 - Electrochemistry. (Visit for all ncert solutions in text and videos, CBSE syllabus, Electrochemistry is that branch of chemistry which deals with the study of.

Electrochemistry Ncert Pdf

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In an indirect redox reaction, the device which converts chemical energy into electrical energy is known as an electrochemical cell. 4. In an electrochemical cell. Electrochemistry- NCERT - Download as PDF File .pdf), Text File .txt) or read online. 12th, CBSE. National Council of Educational Research and Training (NCERT) Book for Class XII NCERT Chemistry Text Book Chapter 3 Electrochemistry is given below Sample Paper for Chemistry is given below for download in PDF format.

It is reciprocal of resistance R. Unit of cell constant is cm-1 or m Specific conductivity decreases on dilution. This is because concentration of ions per cc decreases upon dilution. Its units are ohm-1 cm2 equiv-1 or mho cm2 equiv-1 or S cm2 g-equiv It depends upon the nature of solvent and temperature. The weak electrolytes are ionised to a lesser extent in aqueous solution and have lower values of conductivity molar as well as equivalent. The solubility of a sparingly soluble salt can be calculated as Electrolysis It is the process of decomposition of an electrolyte when electric current is passed through either its aqueous solution or molten state, 1.

In electrolytic cell both oxidation and reduction takes place in the same cell.

Anode is positively charged and cathode is negatively charged, In electrolytic cell. During electrolysis of molten electrolyte, cations are liberated at cathode.

NCERT Class XII Chemistry: Chapter 3 – Electrochemistry

When two or more ions compete at the electrodes. For metals to be deposited on the cathode during electrolysis, the voltage required is almost the same as the standard electrode potential. However for liberation of gases, some extra voltage is required than the theoretical value of the standard electrode potential. The extra voltage thus required is called over voltage or bubble voltage.

How to Predict the Products of Electrolysis? When an aqueous solution of an electrolyte is electrolysed, if the cation has higher reduction potential than water Similarly if anion has higher oxidation potential than water - 1. Discharge potential is defined as the minimum potential that must be applied acrossthe electrodes to bring about the electrolysis and subsequent discharge of the ion on the electrode.

First law The amount of the substance deposited or liberated at cathode directly proportional to the quantity of electricity passed through electrolyte. Second law www. Batteries These are source of electrical energy which may have one or more cells connected in series. For a good quality battery it should be reasonably light. Primary Batteries In the primary batteries. The fuel cells are pollution free and have high efficiency. Corrosion Slow formation of undesirable compounds such as oxides, sulphides or carbonates at the surface of metals by reaction with moisture and other atmospheric gases is known as corrosion.

Factors Affecting Corrosion 1. Reactivity of metals 2.

Presence of moisture and atmospheric gases like CO2, SO2, etc. Standard hydrogen electrode consists of a platinum wire sealed in a glass tube and carrying a platinum foil at one end.

The electrode is placed in a beaker containing an aqueous solution of an acid having 1 Molar concentration of hydrogen ions. Hydrogen gas at 1 bar pressure is continuously bubbled through the solution at K. The oxidation or reduction takes place at the Platinum foil.

NCERT Solutions for Class 12 Chemistry in PDF Form

The standard hydrogen electrode can act as both anode and cathode. If the standard hydrogen electrode acts as an anode: If the standard hydrogen electrode acts as a cathode: In the electrochemical series, various elements are arranged as per their standard reduction potential values.

A substance with higher reduction potential value means that it has a higher tendency to get reduced. So, it acts as a good oxidising agent.

A substance with lower reduction potential value means that it has a higher tendency to get oxidised. So, it acts as a good reducing agent.

The electrode with higher reduction potential acts as a cathode while the electrode with a lower reduction potential acts as an anode. The potential difference between the 2 electrodes of a galvanic cell is called cell potential and is measured in Volts.

The cell potential is the difference between the reduction potential of cathode and anode. Nernst studied the variation of electrode potential of an electrode with temperature and concentration of electrolyte.

Electrode potential increases with increase in the concentration of the electrolyte and decrease in temperature.

Nernst equation when applied to a cell, it helps in calculating the cell potential. At equilibrium, cell potential Ecteell becomes zero. Work done by an electrochemical cell is equal to the decrease in Gibbs energy The substances which allow the passage of electricity through them are known as conductors. Every conducting material offers some obstruction to the flow of electricity which is called resistance.

It is denoted by R and is measured in ohm.

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The resistance of any object is directly proportional to its length l and inversely proportional to its area of cross section A. The SI unit of specific resistivity is ohm metre.

The inverse of resistance is known as conductance, G Unit of conductance is ohm-1 or mho. It is also expressed in Siemens denoted by S. The inverse of resistivity is known as conductivity. It is represented by the symbol.

The SI unit of conductivity is Sm But it is also expressed in Scm Firstly, passing direct current changes the composition of the solution Secondly, a solution cannot be connected to the bridge like a metallic wire or a solid conductor. Conductivity cell: The problem of measuring the resistance of an ionic solution can be resolved by using a source of alternating current and the second problem is resolved by using a specially designed vessel called conductivity cell.

A conductivity cell consists of 2 Pt electrodes coated with Pt black. Resistance of such a column of solution is given by the equation: It is defined as the conducting power of all the ions produced by dissolving 1 mole of an electrolyte in solution. It is the conductivity of all the ions produced by dissolving one gram equivalent of an electrolyte in solution.

Unit of equivalent conductivity is S cm2 g equiv -1 Equivalent conductivity: According to this law, molar conductivity of an electrolyte, at infinite dilution, can be expressed as the sum of individual contributions from its individual ions.

It is denoted by. In electrochemistry, the quantity in which we are most interested is E, the potential energy of the system.

Chapter 1. A process of this kind is known generally as an electrode process. Write a chemical equation that shows the formation of the following ions. AP Chemistry-Electrochemistry. No electrolytic cells Electrochemical cell 1 Electrical energy is converted into chemical energy.

Multiple Choice.

Reactions involving the reactant — the electron. You can read more about this in this Electrochemistry PDF below. Identify the choice that best completes the statement or answers the question. Tips and notes for English, General Paper, and composition writing are also provided. Analyze the design and working of secondary cells. These are the Electrochemistry class 12 Notes prepared by team of expert teachers.

Thanks a lot for this information. All scribed lecture notes are used with the permission of the anonymous student author.

NCERT Class XII Chemistry: Chapter 3 – Electrochemistry

Importance of Electrochemistry 1. Download revision notes for Electrochemistry class 12 Notes and score high in exams. It consists of a copper rod dipping in a solution of copper sulphate, which is separated with the help of a semi permeable membrane or salt bridge from a solution of Zinc sulphate in which a zinc rod is dipped.

It is 2nd sem chemistry notes Electrochemistry is a part of physical chemistry and deals with the chemical changrd accompanying the passage of an electric current - or the reverse process - in which a chemical reaction is used as the source of energy to produce an electric current. Thermodynamics First Law Equipartition Theorem Predictions for Internal Energy and Cv Revision Notes on Redox Reactions and Electrochemistry: Electrochemistry is the branch of chemistry which deals with the chemical changes caused in the matter by passage of electric current and conversion of chemical energy into electrical energy and vice versa.

For example, in cylindrical batteries, the negative terminal is either designed so as to Revision Notes on Redox Reactions and Electrochemistry: Electrochemistry is the branch of chemistry which deals with the chemical changes caused in the matter by passage of electric current and conversion of chemical energy into electrical energy and vice versa.

The subject is of importance both for theoretical and practical considerations. Phosphide ions from a phosphorous molecule. Providing study notes, tips, and practice questions for students preparing for their O level or upper secondary examinations.

A large number of metals, sodium hydroxide, chlorine, Introduction: Electrochemistry is a branch of chemistry, which deals with the relationship between electrical energy and chemical changes taking place in redox reactions. Differentiate between electrolytic cells and galvanic cells?

The above image shows the basic layout of an electrochemical battery, which you can read more about in our electrochemical cell PDF.

We hope that you will understand. This course is being taught by 10 different people.Introduction Hey guys, These notes are more than enough.

In a redox reaction, both oxidation and reduction reaction takes place simultaneously. Mohit Rajpoot. The water vapours produced during the reaction were condensed and added to the drinking water supply for the astronauts.

However for liberation of gases, some extra voltage is required than the theoretical value of the standard electrode potential. In dilute solutions, it is equal to concentration.

Download EduRev app here for Class 12 preparation. Chapter 3. Such a device is called a galvanic or a voltaic cell. Chapter 1 Chapter 2 Chapter 3 Chapter 5.

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