Lecture 7 (10am) Chapter 4 et al (Redox) and Ch 5 (gases) September 22 2009

Lecture 7 (10am) Chapter 4 et al (Redox) and Ch 5 (gases) September 22 2009

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Oxidation and Reduction (Chapters 4 and 21.1) Lecture 7 September 22, 2009
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Lecture Demonstration: Copper wire in an aqueous solution of Silver Nitrate
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Key Concept in Oxidation and Reduction Reactions: Movement of electrons from one reactant to another
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Example of Oxidation-Reduction: Photosynthesis
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Example of Oxidation-Reduction: Decomposition of Hydrogen Peroxide
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Oxidation Numbers The charge an atom in a molecule would have if electrons were transferred completely … an artificial accounting scheme
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Table 4-3, page 160, Silberberg “Chemistry: The Molecular Nature of Matter and Change” 5e.
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Calculate the oxidation number of phosphorus in sodium tripolyphosphate, Na 5 P 3 O 10 . A. +3 B. +5 C. +10 D. +15 E. None of these is correct
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Which is true of the equation? 8KI + 9H 2 SO 4 4I 2 + 8KHSO 4 + H 2 S + 4H 2 O (A) The substance oxidized is KHSO 4 . (B) The oxidizing agent is KI. (C) The substance reduced is H 2 SO 4 . (D) The reducing agent is H 2 S. (E) This is not an oxidation–reduction equation.
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Balancing Redox Reactions: Oxidation Number Method Five Step Method 1.Assign oxidation numbers to all elements
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Lecture 7 (10am) Chapter 4 et al (Redox) and Ch 5 (gases) September 22 2009

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