Electrochemistry_Notes

Electrochemistry_Notes - Chapter19: Electrochemistry...

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Chapter 19: Electrochemistry
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2 Oxidation-Reduction  Reactions In Chapter 4 we introduced the  half- reaction method  for balancing simple  oxidation-reduction reactions. Oxidation-reduction reactions always involve a transfer of electrons from one species to another. Recall that the species losing electrons is oxidized , while the species gaining electrons is reduced .
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3 Oxidation-Reduction  Reactions Describing Oxidation-Reduction  Reactions An oxidizing agent is a species that oxidizes another species; it is itself reduced . A reducing agent is a species that reduces another species; it is itself oxidized . ) ( ) ( 2 ) ( 2 ) ( s aq aq s Cu Fe Cu Fe + + + + oxidizing agent reducing agent Loss of 2 e -1 oxidation Gain of 2 e -1 reduction
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4 Oxidation-Reduction  Reactions In this chapter we will show how a cell is  constructed to  physically separate  an  oxidation-reduction reaction into two  half-reactions. The force with which electrons travel from the oxidation half-reaction to the reduction half- reaction is measured as voltage . Review the rules in Chapter 4 concerning the balancing of oxidation reduction reactions.
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5 Electrochemistry An  electrochemical cell  is a system  consisting of electrodes that dip into an  electrolyte in which a chemical reaction  either uses or generates an electric  current. A voltaic , or galvanic , cell is an electrochemical cell in which a spontaneous reaction generates an electric current.
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6 Electrochemistry An  electrochemical cell  is a system  consisting of electrodes that dip into an  electrolyte in which a chemical reaction  either uses or generates an electric  current. An electrolytic cell is an electrochemical cell in which an electric current drives an otherwise nonspontaneous reaction. In this chapter we will discuss the basic principles behind these cells and explore some of their commercial uses.
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7 Voltaic Cells voltaic cell  consists of two half-cells that  are electrically connected.  Each half-cell is a portion of the electrochemical cell in which a half-reaction takes place. A simple half-cell can be made from a metal strip dipped into a solution of its metal ion. For example, the zinc-zinc ion half cell consists consists of a zinc strip dipped into a solution of a zinc salt.
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Voltaic Cells voltaic  cell consists of two half-cells  that are electrically connected. Another simple half-cell consists of a copper strip dipped into a solution of a copper salt. In a voltaic cell, two half-cells are connected in such a way that electrons flow from one metal electrode to the other through an external circuit . Figure 20.2 illustrates an atomic view of a
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Electrochemistry_Notes - Chapter19: Electrochemistry...

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