Chapter 04 - III - Redox Reactions Complete

Chapter 04 - III - Redox Reactions Complete - 4-1Chapter...

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Unformatted text preview: 4-1Chapter 4Chapter 4The Major Classes of Chemical ReactionsThe Major Classes of Chemical ReactionsIII: Redox ReactionsIII: Redox Reactions4-2Displacing One Metal With AnotherDisplacing One Metal With AnotherCu(s) + AgNOCu(s) + AgNO3(aq)(aq)Copper is more “reactive” than silver -copper gives up 2 electrons and becomes Cu2+- Cu2+goes in solution and forms a copper nitrate solution, Cu(NO3)2(aq)- Electrons are transferred to Ag+ ions that become Ag atoms-Ag atoms deposit on the copper wire as crystalline silverDemonstrate copper precipitate on nail4-3Displacing One Metal With AnotherDisplacing One Metal With AnotherCu(s) + AgNOCu(s) + AgNO3(aq)(aq)•Molecular reaction equationCu(s) + 2AgNO3(aq) 2Ag(s) + Cu(NO3)2(aq)•Total ionic equationCu(s) + 2Ag++ 2NO3-(aq) 2Ag(s) + Cu2+(aq) + 2NO3-(aq)•Net ionic equationCu(s) + 2Ag+2Ag(s) + Cu2+(aq)•Let’s look closer at the “halfreactions”halfreaction 1: Cu(s) Cu2+(aq) + 2e-halfreaction 2: 2Ag++ 2e-2Ag(s) transfer of 2 electrons from copper atoms, Cu, to silver ions, Ag+, forming copper ions, Cu2+,and silver atoms, Agcopper ionsgo into solution, silver atomsprecipitate at the surface where electron transfer takes place“oxidation-reduction” reaction or “redox” reaction4-4Oxidation-Reduction (Redox) ReactionsOxidation-Reduction (Redox) Reactions•Oxidation-Reduction (Redox) reactions–Net movement of electrons from one reactant to the other–Movement from reactant with less attraction to reactant with more attraction for electrons (larger electron affinity)–Occurs in both ionic and covalent bond formation•Most important type of chemical reactions–Formation of compounds from elements•reaction of Na with Cl2–Formation of elements from compounds•electrolysis of H2O to H2and O2–Combustion reactions•reaction of C and O2forming CO2–Energy and electricity generating reactions•electron transfer in mitochondria resulting in the formation of ATP and H2O2 Mg(s)+ O2(g) 2 MgO (s)ionic bond formationtransfer of electrons (formation of cations and anions)H2(g) + Cl2(g) 2 HCl(g)covalent bond formationshift in electron charge (dipole, polarity)4-5The Redox Process in Ionic Compound FormationThe Redox Process in Ionic Compound Formation-oxidation: lossof electronsMg Mg2++ 2e--reduction: gainof electrons½ O2+ 2e-O2-- O2is oxidizingagent, it oxidizesMg- Mg is reducingagent, it reducesO2the oxidizingagent is reducedand the reducingagent is oxidized4-6The Redox Process in Covalent Compound Formation The Redox Process in Covalent Compound Formation -oxidation: decreasein electron charge½ H2H++ e--reduction: increasein electron charge½ Cl2+ e-Cl--Cl2is oxidizingagent, it oxidizesH2-H2is reducingagent, it reducesCl2the oxidizingagent is reducedand the reducingagent is oxidized by a relative shift of electron chargeaway from the H atom toward the Cl atomStudy this4-7Summary of Terminology for Oxidation-Reduction Summary of Terminology for Oxidation-Reduction...
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This note was uploaded on 04/13/2008 for the course CHEM 1311 taught by Professor Baishakhidas,ms. during the Spring '08 term at Alamo Colleges.

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Chapter 04 - III - Redox Reactions Complete - 4-1Chapter...

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