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Electrochemistry MODULE - 5 Notes Chemical Dynamics 15 ELECTROCHEMISTRY lectrochemistry deals with the conversion of electrical energy into chemical energy and vice versa. When electric current is passed through an aqueous solution of certain substances or through molten salts, it causes a chemical reaction to occur. On the other
Electrochemistry is defined as the branch of physical chemistry, which deals with the study of conversion of electrical energy from chemical energy which is produced in a redox reaction or how to get redox reaction by using electrical energy, which is otherwise non-spontaneous. 2 has two (—O—O—) bonds. Oxidation state.
Electrochemistry deals with interconversion of electrical and chemical energy. Many chemical changes can be clearly related to the electrons that move from one species to another.
Electrochemistry is that branch of chemistry which deals with the study of production of electricity from energy released during spontaneous chemical reactions and the use of electrical energy to bring about non-spontaneous chemical transformations.
These lecture notes accompany the ETH Zürich course no. 529-0659-00L ‘Electrochemistry: Fundamentals, Cells & Applications’, comprising 13 lectures of 2 x 45 min plus 1 x 45 min of exercises. The content as well as this text is grouped into an Introduction and 9 Chapters.
ELECTROCHEMISTRY Terms to Know: Electrochemistry – the study of the interchange of chemical and electrical energy . Voltaic or Galvanic Cell – IS a battery but not a dry cell; generates useful electrical energy. Electrolytic Cell – requires useful electrical energy to drive a thermodynamically unfavorable reaction . OIL RIG
• Electrochemistry is the study of the relationship between chemical change and electrical work. • It is examined via the use of electrochemical cells which are systems that incorporate a redox reaction to produce or utilize electrical energy. • Isolated oxidation and reduction processes are not much good. These reactions must be
Electrochemistry Electrochemistry The study of chemical reactions that involve electron or charge transfer (e.g., ions). Redox Processes - electron transfer • oxidation - –lossof electrons – oxidation number increases Ag Ag+ + e-• reduction - –gainin electrons – decrease in oxidation number Fe2+ + 2e- Fe 1 2 3
Electrochemistry is physical measure of electron movement in chemical reactions. In looking for a context for understanding electrochemistry, recognize that all of chemistry centers around the making and breaking of chemical bonds. Chemical bonds are formed by a redistribution of electron density around nuclei.
In an electrochemical cell, a minimum of two half cell reactions must occur, one at the cathode and one at the anode. Electrolyte in anode and cathode chamber in cells with diaphragms/separators is called anolyte and catholyte respectively. For electrochemical reactions to occur, reactants must exist in a charged or ionized state.