lect_12nov5f09

lect_12nov5f09 - Outline 12 5-NOV-2009 1. Review- Redox...

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1 1 Outline 12 5-NOV-2009 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________ Sample Quiz 15 TA_____ 1. Given: Cu + Ag + Cu +2 + Ag a. O.N. change for Cu species = ? b. O.N. change for Ag species = ? Identify c. Oxidizing agent = ? d. Reducing agent = ? e. Write balanced equation.
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3 REDOX Balancing: Ex. 2 Prob. 4.91(b) , p.172. Given: aluminum reacts with aqueous manganese sulfate to make Mn(s). Find: (a) Write skeleton molecular equation. (Atoms in sulfate ions do not undergo O.N. changes.) (c) Identify oxidizing and reducing agents. Use Δ O.N. Soln: (a) Write formulas of products Al(s) + MnSO 4 (aq) → Finish On board. Assign O.N.s &Use arrows
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4 4 REDOX Balancing: Ex. 3 Prob. 4.92(d) , p.172. Given: When aqueous bromine and aqueous potassium iodide react iodine is produced. Find: (a) Write skeleton chemical equation. (b) Identify oxidizing and reducing agents. (c) Calculate ΔO.N. s for the iodine and bromine. (d) Write balanced net ionic equn. Spectator(s)? Soln: Do on board with lines as in text.
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5 5 Stoichiometry; Redox Prob. 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 ). On board. (a)Write balanced chem. eqn. Mg in IIA, N in VA. Mg + N 2 → Mg 3 N 2 (finish balancing, can eyeball it!) O.N. changes? agents? (b) Which is reagent in excess? Go for moles! ICE (c) How many mol product formed? (d) What # mol & mass of each specie present after rxn?
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6 6 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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7 7 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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8 8 Redox Reaction Types 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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9 9 Redox Reaction Types ) g ( H ) aq ( ZnCl ) aq ( HCl 2 ) s ( Zn 2 2 + + displacement reaction (also called single- replacement reaction) - element reacts with compound , displacing another element. See next slide. Agents? O.N. changes?
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This note was uploaded on 10/14/2011 for the course CHEM 1A taught by Professor Okamura during the Spring '08 term at UC Riverside.

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lect_12nov5f09 - Outline 12 5-NOV-2009 1. Review- Redox...

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