Lecture+j - Electronic Homework c11 Acid/Base Weak...

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Unformatted text preview: Electronic Homework c11 Acid/Base Weak Acids/Bases (Approximate Calculations) 26 Apr 2009 c11 Acid/Base Weak Acids/Bases (Quadratic Calculations) 26 Apr 2009 c11 Acid/Base Common Ion Effect 26 Apr 2009 c11 Acid/Base Equilibrium - Buffers 3 May 2009 c12 Redox Principles - Oxidation States 3 May 2009 c12 Redox Principles - Balancing Half Reactions 3 May 2009 c12 Redox Principles - Balancing Redox Reactions 10 May 2009 c12 Electrochemistry - Cell Notation 12 10 May 2009 c12 Electrochemistry - Standard Potential 10 May 2009 c12 Electrochemistry - Equilibrium 17 May 2009 c12 Redox Principles - Balancing Aqueous Redox Reactions 17 May 2009 c13 TBA 17 May 2009 MIDTERM 2 Tues 19 May Ch 12 - Oxidation-Reduction Reactions A redox reaction is a chemical reaction in which one reactant species contains an element which increases its oxidation state during the reaction ( oxidation ) and a second species containing an element which reduces its oxidation state ( reduction ). NOTE: Reduction and oxidation always occur in tandem! If something is oxidized, something else is being reduced. Lets examine the general oxidation/reduction reaction A 2+ + B A + B 2+ . We can write half-reactions , which describe only the reduction or oxidation part of the reaction: oxidation: B B 2+ + 2 e reduction: A 2+ + 2 e A O xidation I s L oss R eduction I s G ain OIL RIG or L oss E quals O xidation or G ain E quals R eduction or LEO GER Electrochemistry is the study of the interchange of chemical and electrical energy, it quantifies oxidation/reduction (redox) reactions and describes ways of putting them to good use- ie in Fuel Cells . Common Oxidation Common Oxidation-Reduction Reactions Reduction Reactions Oxidation Oxidation-reduction reactions involve the transfer of electrons. reduction reactions involve the transfer of electrons. One gains electrons undergoes One gains electrons undergoes reduction reduction , another loses electrons , another loses electrons undergoes undergoes oxidation oxidation . Consider: Consider: 2Na + Cl 2Na + Cl 2 2NaCl 2NaCl written as the sum of two half written as the sum of two half-reactions: reactions: 2Na 2Na 2Na+ + 2e 2Na+ + 2e- oxidation oxidation Cl Cl 2 2 + 2e + 2e- 2Cl 2Cl- reduction reduction The addition of oxygen atoms or hydrogen atoms to an element or The addition of oxygen atoms or hydrogen atoms to an element or compound is also classified as an oxidation compound is also classified as an oxidation-reduction reaction. reduction reaction. CO CO 2 + H + H 2 CO + H CO + H 2 O C 2 H 4 + H + H 2 C 2 H 6 C(IV) C(II) H(0) H(+I) What happens to O ? C(-II) C(-III) H(0) H(+I) How do you figure this out?...
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This note was uploaded on 11/04/2009 for the course CHEM Chem 1C taught by Professor Farmer during the Spring '09 term at UCL.

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Lecture+j - Electronic Homework c11 Acid/Base Weak...

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