Chapter 21.3.  The electrochemical cells require the INPUT of energy rather than creating energy.

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Presentation transcript:

Chapter 21.3

 The electrochemical cells require the INPUT of energy rather than creating energy.

Voltaic Cell -The flow of electrons is the result of a spontaneous redox reaction. -Electrical energy is released to power a battery, light, etc. Electrolytic Cell -Redox process reaction is NOT spontaneous. -Uses outside source like a battery to input electrical energy to do work like: hydrolysis, electrolysis, and electroplating. -Electrons flow from anode to cathode -Reduction occurs at cathode -Oxidation occurs at anode

 1) Electrolysis of Water  2) Electrolysis of Brine  3) Electrolysis in metal processing

 Brine  Brine: A concentration aqueous solution of sodium chloride.

 To produce chlorine and sodium hydroxide in electrolytic cells, electricity is passed through brine, a sodium chloride solution. Why? Why? Its products have many uses including disinfecting swimming pools, cleaning drains, manufacturing soap, and producing paper pulp.

platepurifyrefine  It is used to plate, purify, and refine metals.  A) Electroplating: to plate  B) Electrowinning: impure metals are purified  C) Electrorefining: to refine

 Electroplating is the deposition of a thin layer of a metal on an object in an electrolytic cell. ◦ Similar to coating with a metal, but this is using electricity to do it. The cathode is the object to be plated. The anode is the plating metal.

 Page 683  Perform with a partner.  Answer Questions #1-3

 With a partner, create a study guide to be used for the test.  Test: Tuesday  Notes over  Read pages (Electrolytic VS Voltaic Cells) to help study for the test.