CHM 1046                      QUIZ  2                September 6, 1996


     This quiz is take-home and open book, and it is intended that
all members of the group contribute to completing it.  Only one
copy is to be submitted by the group, and all members who
participated should sign their names below.  Test is due by start
of class on Monday, September 9.

                   List names in alphabetical order!

_______________________  _______________________

_______________________  _______________________

_______________________  _______________________

Points

1.    Balance the following redox reactions occurring in acid
      solution.  Show your work by:
           1.   Identifying the species being oxidized and reduced.
           2.   Writing and balancing the half-reactions.
           3.   Adding the half-reactions correctly.
           4.   Reducing the balanced equation by canceling species
                appearing on both sides of the equation and
                reducing the coefficients to the lowest whole
                numbers.

      
(5)A. Cr2O72-   +    H2S   ---->    Cr3+     +     So

      ______ is being oxidized and ______ is being reduced.














(5)B. S2O32-    +     I2    ----->    SO42-    +     I-

      ______ is being oxidized and ______ is being reduced.








2.    Balance the following redox reactions occurring in basic
      solution.  Show your work by:
           1.   Identifying the species being oxidized and reduced.
           2.   Writing and balancing the half-reactions.
           3.   Adding the half-reactions correctly.
           4.   Reducing the balanced equation by canceling species
                appearing on both sides of the equation and
                reducing the coefficients to the lowest whole
                numbers.

      
(5)A. NO3-   +   S2-   ---->    SO42-    +     NO

      ______ is being oxidized and ______ is being reduced.


















(5)B. MnO4-    +    Cl-    ---->    Mn2+    +    Cl2

      ______ is being oxidized and ______ is being reduced.