Combine the following half-reactions to obtain a balanced overall redox reaction.  Cu2++2e−→Cu   and  Fe→Fe2++2e−  Express your answer as a chemical equation.

13) The average C−C bond dissociation energy (D) is 350 kJ/mol and the average C=C bond dissociation energy is 728 kJ/mol. Based on these values, which is stronger: a σ or a π bond?

write the half-reaction for the reduction equation 4Fe + 3O2 → 2Fe2O3

Verify your calculation. Metals Oxidation half-reaction Zinc and copper Zinc and silver Zinc and lead Zinc and nickel Copper and silver Copper and lead Copper and nickel Silver and lead Silver and nickel Lead and nickel Ni→ Zn→ Zn2+ + 2e Zn → Zn²+ + 2e- Zn→ Zn2+ + 2e- Zn→ Zn2+ + 2e- Ni²+ + 2e¯ → Ni Cu → Cu²+ + 2e- Ag* + e → Ag Reduction half-reaction Cu2+ + 2e → Cu Ag* + e¯ → Ag Pb2+ + 2e →→ Pb Overall reaction Zn(s) + Cu²+(aq) → Zn2+(aq) + Cu(s) Zn(s) + 2Ag+(aq) → Zn²+(aq) + 2Ag(s) Zn(s) + Pb²+(aq) → Zn²+(aq) + Pb(s) Zn(s) + Ni²+(aq) → Zn²+(aq) + Ni(s) Cu(s) + 2Ag+(aq) → Cu²+(aq) + 2Ag(s) Standard cell potential (V) 1.10 1.56 0.63 0.51 0.46 Pb-Pb2+ + 2e- Cu2+ + 2e→ Cu Pb(s) + Cu²+(aq) → Pb²+(aq) + Cu(s) 0.47 → Ni²+ + 2e Cu2+ + 2e→ Cu Pb → Pb²+ + 2e- Ag+ + e → Ag Ni → Ni²+ + 2e Ni→ Ni²+ + 2e- Ag+ + e → Ag Pb2+ + 2e¯ → Pb Ni(s) + Cu²+(aq) → Ni²+(aq) + Cu(s) Pb(s) + 2Ag*(aq) → Pb²+(aq) + 2Ag(s) Ni(s) + 2Ag+(aq) → Ni²+(aq) + 2Ag(s) Ni(s) + Pb²+(aq) → Ni²+(aq) + Pb(s) 0.59 0.93 1.05 0.12…

(1) Identify each of the following half-reactions as either an oxidation half- reaction or a reduction half-reaction. half-reaction Cd(s) Cd²+ (aq) + 2e¯ 2H+ (aq) + 2e →→→H₂(g) identification (2) Write a balanced equation for the overall redox reaction. Use smallest possible integer coefficients. ]+[ +

9. Read very carefully: Alkenes can be OXIDIZED to form carbonyl compounds (- C=0) (see example below). KNOWING this, how would you distinguish the following two alkenes by using this OXIDATIVE reaction? R-CH=CHCH3 à (oxidation) R -CO,H + CH;CO,H BOTH undergo OXIDATION

What is the correct balanced redox reaction for the following reaction? Zn2+(aq) + Al(s) → Zn (s) + Al3+(aq)

For Questions 11-16: Balance the following oxidation-reduction reaction in acidic conditions using the half reaction method by following the step described in each question. ??2?−27(??)+???2(??)⟶??+3(??)+??−3(??)Cr2O7−2(aq)+HNO2(aq)⟶Cr+3(aq)+NO3−(aq) Step 1: Assign the oxidation states of each ATOM in the reaction before and after the reaction takes place. Reactants: Cr =                           ["", "", "", "", "", "", "", "", "", "", "", "", "", "", ""]                             O =                           ["", "", "", "", "", "", "", "", "", "", "", "", "", "", ""]            H =                           ["", "", "", "", "", "", "", "", "", "", "", "", "", "", ""]                               N =                           ["", "", "", "", "", "", "", "", "", "", "", "", "", "", ""]            Products: Cr =                           ["", "", "", "", "", "", "", "", "", "", "", "", "", "", ""]                             O =                           ["", "", "", "", "", "",…