L33_Elec5

L33_Elec5 - Indicate which of the following statements is...

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Indicate which of the following statements is correct: 1 2 3 4 5 76% 5% 0% 10% 10% 1. The anode is always where oxidation reaction is done 2. The anode is always where reduction reaction is done 3. The anode is always negative 4. The anode is always positive 5. Anode always gets electrons from a battery
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Comparison voltaic/galvanic vs electrolytic
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Consider electrolytic cell with the water solution of a salt of Al 3+ . By using the following standard reduction potentials, predict what will be observed on the cathode. Al 3+ + 3e -> Al E 0 =-1.66 V 2H 2 O + 2e -> H 2 + 2OH - E 0 =0-0.83 V 1. Metal Al wi. . 2. Hydrogen. .. 3. No idea. S. 52% 6% 42% 1. Metal Al will be plated out if the voltage is sufficiently large 2. Hydrogen gas will formed if the voltage is sufficiently large. 3. No idea. Sorry I have not studied for Ch. 17 yet.
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Al 3+ + 3e -> Al E 0 =-1.66 V Compare: 2H 2 O + 2e -> H 2 + 2OH - E 0 =-0.83 V Cannot reduce Al from water solution, voltage higher than 1.66 V will electrolyse water Bauxite: Al 2 O 3 nH 2 O + oxides of Fe, Si, Ti + silicates Melting point of Al 2 O 3 : 2050 o C Mixture of Al 2 O 3 /Na 3 AlF 6 (cryolite) : 1000 o C Electrochemical
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This note was uploaded on 07/22/2008 for the course CHEM 115b taught by Professor Reisler during the Spring '08 term at USC.

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L33_Elec5 - Indicate which of the following statements is...

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