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Chemistry

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What is the reduction half-reaction for the following unbalanced redox equation?
Cr2O7^2– + NH4^+ Cr2O3 + N2

A.Cr2O3--> Cr2O7^2–
B.Cr2O7^2– --> Cr2O3
C.NH4^+ --> N2
D.N2 --> NH4^+
I think this is D...?

  • Chemistry -

    in D, nitrogen atoms lose electrons, that is oxidation, right?

  • Chemistry -

    right

  • Chemistry -

    So D is not reduction.

  • Chemistry -

    A is a reduction

  • Chemistry -

    bob for some reason these questions are throwing me off - I need to understand this

  • Chemistry -

    In a, the Cr in the dichromate ion is 6
    in the chromate ion, the Cr is 3, so each Cr must lose three electrons in that reaction. It is an oxidation of the Cr ion.

    Look at B CAREFULLY> you need to think these out. Smart girls don't guess.

  • Chemistry -

    Cassie: figure the oxidation state in each ion, on each side, then figure out what change occured: losing or gaining electrons.

  • Chemistry -

    http://www.shodor.org/unchem/advanced/redox/index.html

  • Chemistry -

    I know and I don't want to guess - I want to know it...automatically

  • Chemistry -

    thank you for your help

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