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anonymous

  • one year ago

Which of the following are oxidation half-reactions? Cr2O72- → Cr3+ MnO4- → MnO2 Fe2+ → Fe3+ Cl- → Cl2

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  1. anonymous
    • one year ago
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    @anitasonia98 would you mind helping me w a few more questions?? sorry i keep tagging you im just new and you have been the most helpful!

  2. anonymous
    • one year ago
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    It's ok! Oxidation means that you're losing electrons :) So which choice would it be?

  3. anonymous
    • one year ago
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    @anitasonia98 would it be choice B?

  4. anonymous
    • one year ago
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    In choice B, Mn is gaining electrons (it has a charge of +7 in MnO4-, and then it has a charge of +4 in MnO2).

  5. anonymous
    • one year ago
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    When you lose electrons, the positive number becomes larger. :)

  6. anonymous
    • one year ago
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    so its C?!

  7. anonymous
    • one year ago
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    @anitasonia98 could it be C and D?

  8. anonymous
    • one year ago
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    C is it :)

  9. anonymous
    • one year ago
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    Wait, hold on

  10. anonymous
    • one year ago
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    It's C. :) A different reaction is going on in D, I think.

  11. anonymous
    • one year ago
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    @anitasonia98 okay thanks! i have like 2 or 3 more questions i need help with is that cool?

  12. anonymous
    • one year ago
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    Np! And that's fine :)

  13. anonymous
    • one year ago
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    @anitasonia98 1.) H2O and OH- are added as needed to the half-reaction equations to make the number of oxygen and hydrogen atoms balance. Divide the chemical equation into two half-reaction equations, identifying which half-reaction is oxidation and which is reduction. H2O and H+ are added as needed to the half-reaction equations to make the number of oxygen and hydrogen atoms balance. Multiply each term in one of the half-reaction equations by a factor that will make the number of electrons lost (in the oxidation) equal to the number of electrons gained (in the reduction). 2.) Consider the following unbalanced redox reaction: I2 → IO3- How many water molecules are needed for balancing? 3 on the reactant side 3 on the product side 2 on the product side 2 on the reactant side 3.) Which of the following is a use for electrolytic cells? electroplating rechargeable batteries car batteries watch battery

  14. anonymous
    • one year ago
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    I haven't done redox reactions in a long time :o As for #3, it would be rechargeable batteries :3

  15. anonymous
    • one year ago
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    I've kinda forgotten how to do redox, whoops. http://www.shodor.org/unchem/advanced/redox/

  16. anonymous
    • one year ago
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    @anitasonia98 thank you! :)

  17. anonymous
    • one year ago
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    Sorry about not being able to answer #1 and #2 :o I haven't done those in such a long time.

  18. anonymous
    • one year ago
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    http://www.cabrillo.edu/~aromero/CHEM_1A/1A_Handouts/Balancing%20Redox%20Reactions.pdf

  19. anonymous
    • one year ago
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    That seems to be a slightly better explanation for how to figureout redox :o

  20. anonymous
    • one year ago
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    figure out*

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