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anonymous

  • 4 years ago

How to determine if a reaction is a redox reaction? I need to know how... I've got a test about it tomorrow.. Also how to determine which is oxidized and reduced? Please help me.Thanks.

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  1. anonymous
    • 4 years ago
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    If there is change in oxidation state of a compound then there is a redox reaction. If a compoun's oxidation number has increased then it is getting oxidized, if its oxidation number has decreased it has been reduced.

  2. anonymous
    • 4 years ago
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    Do you know how to calculate oxidation number?

  3. anonymous
    • 4 years ago
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    no

  4. anonymous
    • 4 years ago
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    Rules for deciding oxidation number. Anything in elemental state is 0 (eg., Cu or Na or O2) All alkali metals(Na,K,Li,Rb) in any compunds are +1. eg, NaCl. Oxygen is always -2.(except O2 and O3). Hydrogen is always +1. All other elements areobtained by balancing oxidation number and charge

  5. anonymous
    • 4 years ago
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    ok. how do i know which is oxidized and which is reduced?

  6. anonymous
    • 4 years ago
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    Lets do some xamples CuSO4 + Zn-> ZnSO4+ Cu. Can you tell me all oxidation number of all compounds.

  7. anonymous
    • 4 years ago
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    I'll do this one for you, Reactants, In first compound, SO4 is 2- charge since CuSO4 is neutral so oxidation number of Cu in CuSO4 is 2+. Now Zn is in elemental state hence it would be 0. Products, In ZnSO4 again Zn is Zn2+ and Cu is 0. Did you understand till here?

  8. anonymous
    • 4 years ago
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    yep, i got it there

  9. anonymous
    • 4 years ago
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    Fine So now in reactants side if you see Cu is 2+ but in products it is 0. This implies there is a redox reaction. Now whichever elemnts oxidation number is increasing it gets oxidized whichever oxidation number is getting decreased it is gettting reduced. So here Cu becomes from 2+ to 0 that means it got reduced while Zn went from 0 to 2+ which means it got oxidized.

  10. anonymous
    • 4 years ago
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    wow, thanks.. i got it already Just one more question, how do you determine the reducing agent and the oxidizing agent?

  11. anonymous
    • 4 years ago
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    Whatever gets oxidized is the reducing agent. Whatever gets reduced is oxidizing agent.

  12. anonymous
    • 4 years ago
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    Here Zn is the reducing agent as it got oxidized.

  13. anonymous
    • 4 years ago
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    ok, thanks :))

  14. anonymous
    • 4 years ago
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    No problem.

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