Chemistry

posted by .

What would the two half reactions be for 2Na+1MgBr2 arrow 2NaBr + Mg? I don't know how to determine this, other than that you separate the elements for the two half reactions. My other question is that when you're translating words and you have an element with Roman numerals such as Lead II, would it be Pb^2 or Pb2 (as a subscript?) Thanks for clearing this up.

  • Chemistry -

    Separating the elements you see in the molecular equations into the two half reactions is EXACTLY what you do.
    2Na + MgBr2 ==> 2NaBr + Mg
    The two half reactions are
    Na ==> Na^+ + e
    Mg^+2 + 2e ==> Mg
    I just wrote the ionic half reactions. Since Br is a spectator ion (notice it didn't change oxidation state; i.e., it is -1 on the left and -1 on the right.)
    To the second question, it depends. GENERALLY (that's most of the time), lead(II) means Pb^+2 and that goes for iron(II) or iron(III) or Cr(III) etc. However, in some cases, such as mercury(I), that is written as Hg22+ because Hg(I) is found as the dimer. [Interestingly, mercury(II) doesn't do that.]
    Mercury(I) chloride's formula is
    Hg2Cl2.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Electrochem

    I have a table of standard potentials in water that gives a number of reactions and their e*reduction. Say I'm looking for the reaction Al(s) --> Al+3 + 3e-, but the book gives me the reaction Al+3 + 3e- --> Al(s) and a E*red …
  2. Chemistry

    Hi, if anyone can give me help for any part of the question that would be great! I know how to draw the cell diagram, but am not sure what the half-reactions would be.... Here is the question: Give the cell diagram notation of the …
  3. Chemistry

    I'm confused with this question as I don't understand how to write the reactions. Here is the question if you could please help me with this question or just even give me an example on how to do it. I would really appreciate it. Thank …
  4. AP Chemistry

    What are the two half-reactions for the basic oxidized-reduction reaction Fe(OH)2+ H2O2 --> Fe(OH)3?
  5. 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 …
  6. chemistry

    Separate this redox reaction into its component half-reactions. Cl2 + 2Na --> 2NaCl
  7. 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 …
  8. Chemistry

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

    Balancing Complete Redxo Reactions. I am not sure how I am suppose to start anything. Even the Half Reactions. BrO3^1- + Br^1- + H^1+ --> Br2 + H20. I need to know all the steps on how to do half reactions & I think I should be …
  10. chemistry

    balance the charge in the two half reactions by multiplying the half reactions by the correct multiplication factors

More Similar Questions