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NCSU CH 101 - Lecture 30

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Slide 1Slide 2Slide 3Enter question text...Enter question text...Enter question text...Q30-4: Choose the best oxidizing agentQ30-5: Choose the best reducing agentEnter question text...1Lecture 30 Objectives:a. Identify reduction components using valence diagrams. b. Free energy change of redox reactions.c. Utilize table of reduction potential.d. Components of galvanic cell.a1. Using the diagram to the right, identify the best oxidizing agent and describe how it was selected.a2. Identify the best reducing agent and describe how it was selected. V has highest Ea3. Why is the reaction below spontaneous?Ox number is deca4. Why is the reaction below non-spontaneous?Ox num are changing but being canceled out because one is inc the other is decVWV2+ + W2- V + WV2- + W V + W2-2Lecture 30 Objectives:b1. The formula for determining the free energy of a redox reaction is shown below. Define each of the variables and give units. energy change moles trans. Faraday Constant voltage on e-b2. What is the sign of Ecell for a spontaneous reaction? Neg What is the sign of Ecell for a non-spontaneous reaction? PosG = – n*F*Ecellc1. What is the “0” reaction on the Reduction Table?Non spontc2. The best reducing agent is located on the left of the table and has 0 valence orbitals.c3. The best oxidizing agent is located on the right of the table and has 2 valence orbitals.c4. Spontaneous redox reactions occur when a chemical on the right of the table reacts with a chemical on the left of the table.3Lecture 30 Objectives:d. Complete the following statements regarding a galvanic cell: Reduction occurs at the cathode which has a ‘_+__’ sign on the voltmeter.Oxidation occurs at the anode which has a ‘_-__’ sign on the voltmeter. Electrons travel from the anode to the cathode.As the redox reaction progresses, the cathode electrode decreases in size and the concentration of redox ion cathodeAs the redox reaction progresses, the anode electrode increases in size and the concentration of redox ion anodeThe salt bridge cations migrate towards the cathode and the anions migrate towards the anodeEnter question text...A. SpontaneousB. Non-spontaneousQ30-1: R2- + S2+  R + SSR4Enter question text...A. SpontaneousB. Non-spontaneousSRQ30-2: R + S4+  R2+ + S2+ 5Enter question text...A. SpontaneousB. Non-spontaneousSRQ30-3: R2+ + S  R + S2+ 6Q30-4: Choose the best oxidizing agentA. R2-B. RC. R2+D. SE. S4+SR7Q30-5: Choose the best reducing agentA. R2-B. RC. R2+D. SE. S4+SR8Enter question text...A. -1.1 V, non-spontaneousB. +1.1 V, spontaneousC. +0.5 V, non-spontaneousD. +0.5 V, spontaneousE. -0.5 V, non-spontaneousQ30-6: What change in potential does an electron experience when it moves from an initial potential of -0.8 V to a final potential at -0.3 V? Is the change spontaneousor non-spontaneous?DEcell = Efinal – EinitialG = –


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