[PDF] class 12 chemistry unit 3 notes

Section – A

1. The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called ___ Ans. The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called cell emf. 2. Greater the solvation of ions, ____ is the conductivity. (greater/lesser) Ans. Conductivi...

Section – B

11. Depict (cell representation) the galvanic cell in which the cell reaction is Cu + 2Ag+? 2Ag + Cu2+ Ans. Cu + 2Ag+? 2Ag + Cu2+cell can be represented is Cu | Cu2+|| Ag+| Ag 12. A solution is placed in two different cells having cell constant 0.1 and 0.5 cm-1 respectively. Which of the two will have greater value of specific conductance? Ans. Bot...

Electrochemistry

Electrochemistry is the study of generating electricity from the energy produced during a spontaneous chemical reaction, as well as the application of electrical energy to non-spontaneous chemical changes.

Electrochemical Cells

A spontaneous chemical reaction is one that can occur on its own, and in such a reaction, the system's Gibbs energy falls. This energy is then transformed into electrical energy. It is also feasible to force non-spontaneous processes to occur by providing external energy in the form of electrical energy. Electrochemical Cells are used to carry out ...

Types

Two types of electrochemical cells are present: Galvanic cells, which converts chemical energy into electrical energy and electrolytic cells which converts electrical energy into chemical energy.

Galvanic Cells

A spontaneous chemical process or reaction is used to extract cell energy, which is then transformed to electric current. For example, a Daniell Cell is a Galvanic Cell in which the redox reaction is carried out using Zinc and Copper. $Zn(s) + C{u^{2 + }}(aq) to Z{n^{2 + }}(aq) + Cu(s)$ Oxidation Half: $Zn(s) to Z{n^{2 + }}(aq) + 2{e^ - }$ Reduct...

Electrolytic Cell

These electrodes are submerged in an electrolytic solution that contains both cations and anions. When current is supplied, the ions migrate towards electrodes of opposite polarity, where they undergo simultaneous reduction and oxidation.

Preferential Discharge of Ions

When more than one cation or anion is present, the discharge process becomes competitive. Any ion that needs to be discharged requires energy, and if there are multiple ions present, the ion that requires the most energy will be discharged first.

Electrode Potential

It can be defined as an element's tendency to lose or gain electrons when in contact with its own ions, causing it to become positively or negatively charged. Depending on whether oxidation or reduction has occurred, the electrode potential will be referred to as oxidation or reduction potential. $M(s)underset{{{text{Reduction}}}}{overset{{{tex...

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Where can I find revision notes for Chapter 3 Chemistry?

Revision notes for Chapter 3 "Electrochemistry" contain all important topics, which students need to refer to for Class XII Board exams. Visit the page Class 12 Chemistry Revision Notes for Chapter 3. You will be taken to the page containing the required revision notes. As you scroll down you will find the option to "Download pdf." Click on it.

What are CBSE notes for Class 12 chemistry?

By studying through these CBSE Notes for Class 12 Chemistry, students will find that each Chemistry concept is explained lucidly, including the equations, diagrams and important questions. They will get a quick overview of the important topics and formulas. Moreover, students can use these notes for quick revisions before exams.

What is electrochemistry class 12?

Electrochemistry Cla... Electrochemistry is a vital section of chemistry that determines the function of electrodes and reactors. Vedantu’s Electrochemistry notes class 12 tries to situate the ideas behind the chemical reactions.

What is ionic conductor in Class 12 chemistry?

Class 12 Chemistry Chapter 3 notes explain this function of electrons where two metallic electrodes are present. These metallic electrodes are immersed in an electrolytic solution for power generation. By thorough reading of chapter 3 Chemistry class 12 notes, students will know that the ionic conductor is a vital part of cells.

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Electrochemistry Class 12 Notes CBSE Chemistry Chapter 3 [PDF] - Veda

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