Chemistry, electrochem

posted by .

(1) Half-reactions are written as ______ reactions with charge and mass balanced.

(2) Among the ions, Cd^2+, Pb^2+ & Ca^2+, ________ has the greatest ability to reduce to its neutral metal.

(3) Among the neutral metals; Pb, Ca & Cd, ________ has the least ability to oxidize to the +2 ion.

I really need help for 2 & 3, but for the first one, half-reactions are written as oxidation reactions, right?

  • Chemistry, electrochem -

    I write half reactions as oxidation reactions if that is the way they go in the system or as reduction reactions if that is the way they go. But if the problem is not addressing a specific reaction but the table of potentials, those are written as reduction reactions.[This has been a heated discussion years among chemists with some preferring to write the tables as oxidation and others preferring reduction. As it now stands, the IUPAC has agreed that writing all tables in recution form is will be the standard.
    For 2 and 3, look up the activity series in your text or notes. The activity series is a list of metals, not ions, being oxidized with the most reactive on top and the least reactive on bottom.
    My text lists the metals in this order:
    Ca
    Cd
    Pb.
    That means that Ca is the strongest reducing agent (going to Ca ==> Ca^+2 + 2e). Of course, that means Ca is the easiest to oxidize. That answers #3, but of course you want the one at the bottom of the list if you want the least ability to oxidize. For #2, just reverse the reasoning. If Pb has the least ability to oxidize to the +2 ion, then ____ has the greatest ability for the +2 ion to be reduced.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    Neutral metal sphere A, of mass 0.10kg, hangs from an insulating wire 2.0m long. An identical metal sphere B, with charge -q is brought into contact with sphere A. Sphere A goes 12 degrees away from Sphere B and there is a 90 degree …
  2. Chemistry

    From the Standard Potential Table in your general chemistry textbook: Half-reactions are written as _________ reactions with charge and mass balanced. Among the ions, Cd2+Pb2+ & Ca2+ ,__________ has the greatest ability to reduce to …
  3. Physics repost

    Neutral metal sphere A, of mass 0.10kg, hangs from an insulating wire 2.0m long. An identical metal sphere B, with charge -q is brought into contact with sphere A. Sphere A goes 12 degrees away from Sphere B and there is a 90 degree …
  4. Physics

    Neutral metal sphere A, of mass 0.10kg, hangs from an insulating wire 2.0m long. An identical metal sphere B, with charge -q is brought into contact with sphere A. Sphere A goes 12 degrees away from Sphere B. Calculate the initial …
  5. Inorganic chemistry

    Consider the half-reactions: Cu^2+(aq) +2e^- ==> Cu(s) E naught = +0.34V Sn^2+(aq) + 2e^- ==> Sn E naught = -0.14V Fe^2+ + 2e^- ==> Fe(s) E naught = -0.44V Al^3+(aq) = 3e^- ==> Al(s) E naught = -1.66V Mg^2+(aq) = 2e^- ==> …
  6. chemistry

    Use the following steps to balance the redox reaction below: Mg + Au+ Mg2+ + Au -Write the oxidation and reduction half-reactions. Make sure each half-reaction is balanced for number of atoms and charge. -Multiply each half-reaction …
  7. chemistry-balanced redox equations

    Use the following steps to balance the redox reaction below: Mg + Au+ Mg2+ + Au a. Write the oxidation and reduction half-reactions. Make sure each half-reaction is balanced for number of atoms and charge b. Multiply each half-reaction …
  8. chemistry

    Using the half-reaction method, balance the redox reaction below. Show your work; partial credit will be given. I- + Br2 → IO3- + Br- Write the reduction and oxidation half-reactions. Balance them for atoms. Balance each of the …
  9. Chemistry

    3. Which oxidation-reduction reactions are best balanced by the half-reaction method?
  10. Chemistry

    Are solutions of the following salts acidic, basic, or neutral?

More Similar Questions