31 Voltaic Cells

31 Voltaic Cells - (a Identify the oxidation numbers of all...

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1 (a) Identify the oxidation numbers of all the elements in each of the following reactions. (b) Identify the oxidizing and reducing agent in each of the following reactions. Which statement is correct? (remember carbonic acid = H 2 CO 3 ) A) Both are redox reactions. B) Only the top equation is a redox reaction. C) Only the bottom equation is a redox reaction. D) Neither is a redox reaction. 2 (a) Identify the oxidation numbers of all the elements in each of the following reactions. (b) Identify the oxidizing and reducing agent in each of the following reactions. Which statement is correct? A) Both equations are redox reactions. B) Only the top equation is a redox reaction. C) Only the bottom equation is a redox reaction. D) Neither equation is a redox reaction. +2 -2 +2 -2 0 +4 2 x(-2) +2 +4 3x(-2) +2 -2 +4 2 x(-2)
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3 Today’s To Do Calculate a electrochemical cell potential from the Gibbs free energy change. Calculate a standard electrochemical cell potential using a table of standard reduction potentials. Identify the relative strengths of oxidizing agents and reducing agents from a table of standard reduction potentials. 4 Obtaining energy and work from a waterfall!
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5 A battery produces usable energy in a way that is similar to a waterfall. h E V = m g h G = n F E Change in potential energy = mass of water x gravitational constant x height difference Change in free energy = moles of e - x Faraday’s constant x voltage difference 6 Electrochemical Potential Because electrons are produced at the anode
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31 Voltaic Cells - (a Identify the oxidation numbers of all...

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