(a) Compare and contrast ionic conduction and metallic conduction, (b) What is a
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(a) Compare and contrast ionic conduction and metallic conduction, (b) What is an electrode? (c) What is ii/i inert electrode? Support or refute each of the following statements: (a) In any electrochemical cell, the positive electrode is the one toward which the electrons flow through the wire, (b) The cathode is the negative electrode in any electrochemical cell. For each of the following unbalanced equations, (i) write the half-reactions for oxidation and reduction, (ii) identify the species that lose and the species that gain electrons, and (iii) write the balanced net ionic equation for the overall reaction. (See Sections 11-4 and 11-5.) Cr(s) + Au3+(aq) rightarrow Cr2+ (aq) + Au(s) NO2- (aq) + Cr2O72- (aq) rightarrow NO3- (aq) + Cr3+ (aq) (acidic solution) N2O4(aq) + Br2(aq) rightarrow NO2- (aq) + Br- (aq) (basic solution) Balance the following redox equations. All occur in basic solution. (See Sections 11-4 and 11-5.) Al(s) + OH- (aq) rightarrow Al(OH)4- (aq) + H2(g) CrO42-(aq) + SO32-(aq) rightarrow Cr(OH)3(s) + SO42- Zn(s) + Cu(OH)2(s) rightarrow [Zn(OH)4]2-(aq) + Cu HS-(aq) + ClO3-(aq) rightarrow S(s) + Cl- (aq)Explanation / Answer
a.vCr --> Cr2+ +2e- Au3+ +3e- -->Au 3Cr+2Au3+ --> 3Cr2+2Au chromium loses electrons and gold accepts. b. NO2- -->NO3- +2e- (Cr2O7)2- +8e- -->2Cr3+ 4NO2- +(Cr2O7)2--->4NO3- +2Cr3+ nitrogen loses electrons and chromium accepts c. N2O4+2e- -->2NO2- Br2 +2e- -->2Br- N2O4+Br2+4e- -->2NO2- + 2Br- nitrogen accepts electrons and bromine releases
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