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General G003: Balancing redox reactions

  • Page ID
    63681
  • These questions focus on balancing redox equations. You may wish to review oxidation & reduction or balancing equations you take the quiz.

    The following questions are "fill in the blank", where you enter the coefficients in order to balance the chemical equation. In cases where only one molecule/formula unit is required, you must enter "1" into the box - do not leave it blank. These questions are for self-testing only, and are not suitable for assignments or exams.

    When you have answered all parts, click the Submit button to see your score.

    1.Balance the following redox equation. Enter "1" if only one unit of the substance is needed - do not leave any number blank, and do not use fractional numbers.

    ____ CuCl(s) +____ Cl2(g)→ ____ CuCl2(s)

    2.Balance the following redox equation. Enter "1" if only one unit of the substance is needed - do not leave any number blank, and do not use fractional numbers.

    ____ H2(g) + ____ Al2O3(s) → ____ Al + ____ H2O(g)

    3.Balance the following redox equation. Enter "1" if only one unit of the substance is needed - do not leave any number blank, and do not use fractional numbers.

    ____ Na(l) + ____ PbCl2(s) → ____ NaCl(s) + ____ Pb(l)

    4.Balance the following redox equation. Enter "1" if only one unit of the substance is needed - do not leave any number blank, and do not use fractional numbers.

    ____ Fe2(SO4)3(aq) + ____ Zn(s) → ____ FeSO4(aq) + ____ ZnSO4(aq)

    5.Balance the following redox equation. Enter "1" if only one unit of the substance is needed - do not leave any number blank, and do not use fractional numbers.

    ____ CuBr2(s) → ____ CuBr(s) + ____ Br2(g)

    6.Balance the following redox equation. Enter "1" if only one unit of the substance is needed - do not leave any number blank, and do not use fractional numbers.

    ____ SO2(g) + ____ Ag2CO3(s) + ____ H2O(l) →____Ag(s) + ____ CO2(g) + ____ H2SO4

    7.Balance the following redox equation. Enter "1" if only one unit of the substance is needed - do not leave any number blank, and do not use fractional numbers. CeO2 is cerium(IV) oxide.

    ____ CeO2(s) + ____ HCl(aq) → ____ CeCl3(aq) + ____ Cl2(g) + ____ H2O(l)

    8.Balance the following redox equation. Enter "1" if only one unit of the substance is needed - do not leave any number blank, and do not use fractional numbers.

    ____ MnSO4(aq) + ____ KMnO4(aq) + ____KOH(aq) → ____ MnO2(s) + ____ K2SO4(aq) + ____ H2O(l)

    9.Balance the following redox equation. Note that OCOCH3 represents ethanoate (acetate) ion. Enter "1" if only one unit of the substance is needed - do not leave any number blank, and do not use fractional numbers.

    ____ Fe(OCOCH3)2(aq) + ____ K2CrO4(aq) + ____ HOCOCH3(aq) → ____ Fe(OCOCH3)3(aq) + ____ Cr(OCOCH3)3(aq) + ____ KOCOCH3(aq) + ____ H2O(l)

    10.Balance the following redox equation, a distinctive reaction of Template:S\$ compounds. Enter "1" if only one unit of the substance is needed - do not leave any number blank, and do not use fractional numbers.

    ____ KVO3(aq) + ____ Zn(s) + ____ H2SO4(aq) → ____ VSO4(aq) + ____ K2SO4(aq) + ____ ZnSO4(aq) + ____ H2O(l)

    Answers:

    1. 2,1,2

    2. 3,1,2,3

    3. 2,1,2,1

    4. 1,1,2,1

    5. 2,2,1

    6. 1,1,1,2,1,1

    7. 2,8,2,1,4

    8. 3,2,4,5,3,2

    9. 3,1,8,3,1,2,4

    10. 2,3,6,2,1,3,6