14.Oxidation_reduction_Part_3

14.Oxidation_reduction_Part_3 - Chapter 14:...

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Chapter 14: Oxidation-reduction reactions Part 3 Skip section 14.5 (balancing complex redox reactions) A Bonus Quiz will be posted on Blackboard after the spring break: Tuesday March 22, at 5:00 pm -----
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Chemical reactions (chapter 12) In a vessel add A and B and determine K eq for the following reaction A + B ----> C + D If K eq >> 1 , starting with A and B, the reaction will proceed in the shown direction until equilibrium is reached (favorable reaction in the shown direction) __________________________________ If K eq << 1 , starting with A and B, only small amount (if any) of products is produced (unfavorable reaction in the shown direction) ________________________________________ If K eq = 1 , starting with A and B, the reaction will take place until reaching similar amounts of products and reactants -----
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Chemical reactions Recall: Favorable reactions release energy (exothermic) Energy is required to drive unfavorable reactions (endothermic) ---
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Practical use of redox reactions Burning carbon to produce heat (favorable redox reaction) C + O 2 -> CO 2 + heat (exothermic) Burning methane (gas) in a kitchen stove (favorable redox reaction) CH 4 + 2 O 2 -> CO 2 + 2 H 2 O + heat (exothermic) ----
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Electrochemistry Use of favorable redox reactions to produce electricity o (i.e. batteries) Use of electricity to drive unfavorable redox reactions o (i.e. charging a battery) -----
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Example of a favorable redox reaction Add Zn to a solution of CuSO 4 the following redox reaction would spontaneously occur Zn + Cu SO 4 -> Zn SO 4 + Cu The reaction is favorable, producing thermal energy It is not practical to harness thermal energy from that reaction (as done for redox reactions that burn coal and methane) However, we can setup a system to harness the energy released in favorable redox reactions as electrical energy ---
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14.Oxidation_reduction_Part_3 - Chapter 14:...

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