Hour Test I (pink)                          Name__________________________

CHM 1045 (Dr. Light)                     Soc.Sec.Num._____________________

February 9, 1996                 8:00 am         Recitation Section_______

This exam consists of 4 pages.  Make sure you have
one of each.  Print your name at the top of each page
now.  A blank scratch sheet and a periodic chart are
provided.  Please do not write on the periodic chart,
and turn it in with your test.  You may discard the
scratch sheet.  Show your work on calculations,
including unit conversions, and give answers in the
correct units and appropriate number of significant
figures.

In problems involving molecular and formula weights,
you may use values rounded to the nearest 0.1 amu.

If anything confuses you or is not clear, raise your hand and ask!

(6)  1.    Mercury has a density of 13.6 g/cm3.  A laboratory beaker
           weighs 10.2 g empty and 31.7 g when filled with water.  What
           would be the weight of the beaker if filled with mercury (i.e.
           the total weight of beaker plus mercury).  (Remember, the
           density of water is 1.00 g/cm3.









(4)  3.    Name the following compounds:


     Be(OH)2 ____________________    Li3PO4     ____________________



(4)  4.    Write the formulas for the following:

     iron (II) bromite          ____________________

     dinitrogen pentoxide       ____________________


(8)  5.    Give the atomic symbol, including Z, A, and q for atoms or
           ions containing the following numbers of particle:

           (a)  15 p,  16 n,  15 e         (b)  28 p,  30 n,  26 e






(6)  6.    Give the number of protons, neutrons, and electrons in the
           following:

           Nuclide         protons   neutrons   electrons


            65Zn+2         _______   ________   ________


            112Cd          ________  ________   ________


(3)  7.    Which of the following men (circle your answer) working with
           the cathode ray tube discovered and characterized the
           charge/mass ratio of the cathode ray particles?

           Becquerel, Rutherford,  Thompson,  Millikan,  Dalton, Priestly


(7)  8.    Balance the following chemical equations:



     (a)   ____La2O3  +   ____H2O  ----->  ____La(OH)3



     (b)   ____Al   +   ____HCl    ----->  ____AlCl3   +    ____H2




(15) 9.    Complete and balance the chemical equations for:

     (a)   Reaction of potassium with water.






     (b)   Complete combustion of butyric acid (C4H8O2).







     (c)   Reaction of sulfuric acid with sodium hydroxide.






(6)  10.   Calculate the number of grams in 93.8 moles of P2O5.









(8)  11.   Calculate the number of molecules in 33.1 g of ethyl alcohol,
           C2H6O.











(10) 12.   A compound containing only carbon, hydrogen and oxygen was
           shown by combustion analysis to consist of 31.6% C and 5.31%
           H.  What is its empirical formula?












     13.   Given the following chemical equation:

           2 HI  +  Ba(OH)2  ----->   BaI2   +   2 H2O


(8)  (a)   3.25 g of HI are dissolved in water and the solution is
           titrated with a solution of Ba(OH)2.  The titration requires
           45.3 mL of the Ba(OH)2 solution.  What is the molarity of the
           Ba(OH)2 solution?












(6)  (b)   22 mL of a solution of 0.15 M Ba(OH)2 is mixed with 38 mL of
           a solution of 0.15 M HI.  Which is the limiting reagent? 
           (Show your work).









(6)  (c)   In part (b) above, how many grams of BaI2 will be formed?









(3)  (d)   In part (b) above, how many moles (or millimoles) of the
           excess reagent will be left?