4. Balance the following equations (show work) a.___H2(g) +___O2(g) →___H2O(1)

b._Fe(s) +___O2(g)→___Fe2O3(s)

c.___Al(s) +___HCl(aq) →___AlCl3(aq) +___H2(g)

d._CaCO3(s) +_HCl(aq) →_CaCl2(aq) +_CO2(g) +_H2O(1)

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Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.