Chemistry > STUDY GUIDE > Electrochemistry Notes.pdf. Chemistry part 1 (All)

Electrochemistry Notes.pdf. Chemistry part 1

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Electrochemistry is the study of the relationships between electrical energy and chemical reactions. Before proceeding further in this chapter, it is important that you thoroughly review the following ... topics in Chapter 2. 1) Concepts of oxidation and reduction 2) Calculating oxidation numbers 3) Balancing half-reactions in acidic and basic solutions 4) Balancing redox reactions in acidic and basic solutions Electrochemistry is mainly the study of two types of electrochemical cells: Voltaic or Galvanic Cell and Electrolytic Cell a) Voltaic or Galvanic Cell In this type of cell, a chemical reaction produces electrical energy. All batteries contain Voltaic cells. The electrical energy from Voltaic cells is used to operate electrical devices such as flashlights, CD players, etc... Hence, during the operation of a Voltaic cell, work (w) is done by the system on the surroundings. b) Electrolytic Cell In this type of cell, energy from an external power supply is used to force a chemical reaction. Electroplating and extraction of metals from ores use electrolytic cells. Hence, during the operation of an Electrolytic cell, work (w) is done by the surroundings on the system. Sections 19.2 - 19.3: Voltaic Cell Consider the redox reaction occurring in a Voltaic cell: +2+2Zn + CuÆZn+ Cu (s)(aq)(aq)(s)Break the redox reaction into an oxidation half-reaction Consider the redox reaction occurring in a Voltaic cell: +2+2Zn + CuÆZn+ Cu (s)(aq)(aq)(s)Break the redox reaction into an oxidation half-reaction, -+2Zn ÆZn+ 2 e [Show More]

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