Lecture_16_102711 - Lecture 16: The Mole Goals: Define the...

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Lecture 16: The Mole Goals: Define the terms oxidation and reduction. Use Avogadro’s number to determine the number of particles in a given amount of moles. Determine the molar mass of a substance. Using the molar mass, convert between grams and moles. Outline (Timberlake 6.3-6.5): ± Oxidation-Reduction Reactions (6.3) ± The Mole (6.4) ± Molar Mass (6.5) Problems for Extra Practice: 6.23, 6.25, 6.27, 6.29, 6.31, 6.33, 6.35, 6.37, 6.39, 6.41, 6.43
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Oxidation-Reduction Reactions Many important chemical reactions involve oxidation and reduction. In fact, most reactions used for energy production are redox reactions : In humans the oxidation of sugars, fats, and proteins provides the energy necessary for life. Combustion reactions, which provide most of the energy to power our civilization, also involve oxidation and reduction. Glucose + O 2 b Energy C x H y + O 2 CO 2 + H 2 O + Energy
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2 Na(s) + Cl 2 (g) b 2 NaCl(s) NaCl contains the ions Na + and Cl - Electrons are transferred Energy is released Formation of NaCl is a REDOX Reaction
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An oxidation–reduction reaction • transfers electrons from one reactant to another O xidation I s a L oss of electrons ( OIL ) Zn( s ) Zn 2+ ( aq ) + 2 e - R eduction I s a G ain of electrons ( RIG ) Cu 2+ ( aq ) + 2 e - Cu( s ) Transfer of Electrons
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Mnemonic devices LEO says GER OIL RIG
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Oxidized or Reduced?
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Zn and Cu 2+ oxidation Zn( s ) Zn 2+ ( aq ) + 2 e - Silvery metal reduction Cu 2+ ( aq ) + 2 e - Cu( s ) Zn(s) + Cu 2+ (aq) b Cu(s) + Zn 2+ (aq) Zn(s) + CuSO 4 (aq) b Cu(s) + ZnSO 4 (aq)
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Identify each of the following as: 1) oxidation or 2) reduction __A. Sn( s ) Sn 4+ ( aq ) + 4 e - __B. Fe 3+ ( aq ) + 1 e - Fe 2+ ( aq ) __C. Cl 2 ( g ) + 2 e - 2Cl - ( aq ) Learning Check
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reactions for the following equation. 2Cs(
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This note was uploaded on 01/18/2012 for the course CHEM 120A taught by Professor Leahmiller during the Fall '11 term at University of Washington.

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Lecture_16_102711 - Lecture 16: The Mole Goals: Define the...

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