lect_17nov5f08

lect_17nov5f08 - Outline 17 5-NOV -2008 1. Review- Redox...

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1 Outline 17 5-NOV -2008 1. Review- Redox agents, balancing, O.N. is per symbol (atom) net O.N. increase = net O.N. decrease 2. Redox- Types balancing (Student read) 3. Thermochemistry Chem. Rxns. & Energy 4. System & Surroundings, Energy Forms, Signs
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2 Name________Quiz 16 TA_____ Lab Section_____ 1. Given: Cu + Ag + Cu +2 + Ag a. Oxidizing agent? b. Reducing agent? 2. Write balanced equation ? Cu + ? Ag + ? Cu +2 + ?Ag a. O.N. change for Cu species? b. O.N. change for Ag species?
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3 Redox , Ex: Write, balance Ex: 4.92(d) , p.172. Write balanced chem. eqn. for aqueous potassium iodide and aqueous bromine. Identify oxidizing and reducing agents. Spectator(s)? Soln: Do on blackboard (or camera) with lines as in text.
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4 Stoichiometry; Redox Ex: 4.96 , p.172. In a combination rxn, 2.22 g of magnesium (24.32 g/mol Mg) are heated with 3.75 g nitrogen (28.00 g/ mol N 2 ). (a)Write balanced chem. eqn. Mg in IIA, N in VA. Mg + N 2 → Mg 3 N 2 (finish balancing) O.N. changes? agents? (b) Which is reagent in excess? (c) How many mol product formed? (d) What mass of each specie present after rxn?
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5 Redox Reaction Types Most redox reactions fit one of following types : Combination Reactions Decomposition Reactions Displacement Reactions Combustion Reactions Names are descriptive. (You read over them on next 6 slides!)
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6 Redox Reaction Types Combination Reactions combination reaction - two substances combine to form a third substance . . ) l ( SbCl 2 ) g ( Cl 3 ) s ( Sb 2 3 2 + Antimony and chlorine combine in a fiery reaction. Agents? O.N. changes?
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7 Redox Reaction Types Decomposition Reactions decomposition reaction - single compound reacts to give two or more substances. ) g ( N ) g ( O H 4 ) s ( O Cr ) s ( O Cr ) NH ( 2 2 3 2 7 2 2 4 + + Ammonium dichromate volcano Agents? O.N. changes?
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8 Redox Reaction Types Displacement Reactions ) g ( H ) aq ( ZnCl ) aq ( HCl 2 ) s ( Zn 2 2 + + displacement reaction (also called single-
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This note was uploaded on 02/18/2009 for the course CHEM 1A taught by Professor Okamura during the Fall '08 term at UC Riverside.

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lect_17nov5f08 - Outline 17 5-NOV -2008 1. Review- Redox...

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