answerschapter18practice

answerschapter18practice - 1 Reduction electrons are added...

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1. Reduction – electrons are added to reactant side Cathode – Reduction always occurs at the cathode. 2. Ni +2 + 2e -1 Æ Ni o 3. The salt bridge is there to maintain charge neutrality. If the electrons travel from the anode to the cathode without the salt bridge, there would be an accumulation of electrons and negative charges on one side. The salt bridge avoids this. 4. In the notation always written as A B C Anode Bridge Cathode Identify what is getting oxidized. This is happening in the anode and occurs as an oxidation. Cu +2 + 2e -1 - reduction Cu (s) | Cu +2 Fe o Æ Fe +2 + 2e -1 oxidation Fe|Fe (s) We now put it together in abc form and the answer is D 5. Do not do this one. 6. Separate into two half reactions Cd(s) Æ Cd +2 + 2 e -1 oxidation anode Ag +1 + 1e -1 Æ Ag o reduction cathode Everything is balanced but the electrons Cd(s) Æ Cd +2 + 2 e -1 oxidation anode 2(Ag +1 + 1e -1 Æ Ag o ) reduction cathode Now add and the electrons will cancel Cd(s) + 2 Ag +1 + 2e -1 Æ Cd +2 + 2 e -1 + 2 Ag +1 Cd(s) + 2 Ag +1 Æ Cd +2 + 2 Ag o so answer is A
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7. Platinum is inert.
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This note was uploaded on 12/17/2011 for the course CHM 1046 taught by Professor Staff during the Fall '08 term at FIU.

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answerschapter18practice - 1 Reduction electrons are added...

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