CHM 1046                    PRE-TEST  1                   May 22, 1996


     This test 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 10:30 am on Tuesday, May 28. 
Place in the CHM 1046 box in 208 HTL. 

         List names in alphabetical order!

_______________________  _______________________

_______________________  _______________________

_______________________  _______________________

Points

1.    For the potential reactants below:
      1)   provide the correct formulas in molecular form for the
           potential reactants;
      2)   provide correct formulas for the potential metathesis
           products in the molecular form;
      3)   write a balanced, net ionic equation, or indicate "no net
           ionic equation" if there is none;
      4)   if there is a net reaction, state your conclusion as to
           whether it goes forward, backward, or is indeterminate.


(6)A. iron(II) phosphate  +  sodium nitrate











(6)B. calcium chloride  +  ammonium sulfide











(6)2. Circle the strong acids in the following list:

      HCl       NaOH       HSO4-      HI        HF         HClO3



3.    Balance the following redox reactions under the conditions
      indicated.  Show your work by writing and balancing the half-
      reactions.  Reduce the balanced equation by canceling species
      on both sides and by reducing the coefficients to the lowest
      whole numbers.  Identify the reacting species called for
      immediately below the equation.

(12)A.NO3-   +    S2-  --->   SO42-    +   NO    (in base)

      Oxidizing agent ________        Reducing agent ______















(12)B.UO22+   +    Zno   ---->    U4+    +    Zn2+  (in acid)

      substance oxidized ______       substance reduced ______













(6)4. Predict whether the following displacement reactions will
      occur, and if so give the overall balanced reaction:

      Co   +   Mn2+

      Au3+ +   Pb

      H2   +   Al3+
5.    A commercial reagent bottle of concentrated HNO3 says that the
      concentration is 68% HNO3 with a specific gravity of 1.41
      g/mL.

(6)   (a)  What is the molarity (M) of this solution?












(6)   (b)  What is the molality (m) of this solution?











(6)   (c)  What is the mole fraction (X) of HNO3 in this solution?











(6)6. A 455 mL sample of well water from a farm was found to contain
      23.2 micrograms of ethylene dibromide (C2H4Br2).  What is the
      ethylene dibromide concentration when expressed in
      
      (a) parts per million (ppm)?



      (b) parts per billion (ppb)?





(12)7.You mix 2.00 L of ethylene glycol antifreeze (C2H6O2) (density
      = 1.11 g/mL) with 8.00 L of water to use as a coolant in your
      car radiator.  Calculate the molality of ethylene glycol in
      the solution, and the freezing point of the solution.  (Kf for
      water = 1.86 oC/m).



















(6)8. In the following list, place an h next to the solution with
      the highest boiling point, and an l next to the one with the
      lowest boiling point.

      ____ 0.20 m acetic acid

      ____ 0.15 m sodium chloride

      ____ 0.10 m ammonium phosphate


(10)9.You isolate a plant from a salty marsh area and would like to
      grow it in your fish tank.  You measure the osmotic pressure
      of the water from the marsh to be 3.1 atmospheres.  How many
      grams of NaCl will you need to add to your 10.0 L tank of
      water to make salt water with this osmotic pressure?  (Assume
      T = 25 oC).