anonymous
  • anonymous
Which of the following are oxidation half-reactions? Cr2O72- → Cr3+ MnO4- → MnO2 Fe2+ → Fe3+ Cl- → Cl2
Chemistry
schrodinger
  • schrodinger
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anonymous
  • anonymous
@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!
anonymous
  • anonymous
It's ok! Oxidation means that you're losing electrons :) So which choice would it be?
anonymous
  • anonymous
@anitasonia98 would it be choice B?

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anonymous
  • anonymous
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).
anonymous
  • anonymous
When you lose electrons, the positive number becomes larger. :)
anonymous
  • anonymous
so its C?!
anonymous
  • anonymous
@anitasonia98 could it be C and D?
anonymous
  • anonymous
C is it :)
anonymous
  • anonymous
Wait, hold on
anonymous
  • anonymous
It's C. :) A different reaction is going on in D, I think.
anonymous
  • anonymous
@anitasonia98 okay thanks! i have like 2 or 3 more questions i need help with is that cool?
anonymous
  • anonymous
Np! And that's fine :)
anonymous
  • anonymous
@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
anonymous
  • anonymous
I haven't done redox reactions in a long time :o As for #3, it would be rechargeable batteries :3
anonymous
  • anonymous
I've kinda forgotten how to do redox, whoops. http://www.shodor.org/unchem/advanced/redox/
anonymous
  • anonymous
@anitasonia98 thank you! :)
anonymous
  • anonymous
Sorry about not being able to answer #1 and #2 :o I haven't done those in such a long time.
anonymous
  • anonymous
http://www.cabrillo.edu/~aromero/CHEM_1A/1A_Handouts/Balancing%20Redox%20Reactions.pdf
anonymous
  • anonymous
That seems to be a slightly better explanation for how to figureout redox :o
anonymous
  • anonymous
figure out*

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