Hour Test I (canary)                        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 13.5 g empty and 39.8 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:


     Ba(ClO3)2 ____________________        Li2SO3     ____________________



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

     lead (II) phosphate        ____________________

     diphosphorus pentoxide     ____________________


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

           (a)  16 p,  16 n,  18 e         (b)  30 p,  35 n,  30 e






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

           Nuclide         protons   neutrons   electrons


            73Ge           _______   ________   ________


            108Ag+1        ________  ________   ________


(3)  7.    Which of the following men (circle your answer) discovered
           radioactivity while studying whether x-rays could be produced
           by flourescence of minerals.

           Becquerel, Rutherford,  Thompson,  Millikan,  Dalton, Priestly


(7)  8.    Balance the following chemical equations:



     (a)   ____Al2O3  +   ____H2O  ----->  ____Al(OH)3



     (b)   ____Sr   +   ____HCl    ----->  ____SrCl2   +    ____H2




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

     (a)   Reaction of sodium with water.






     (b)   Complete combustion of lauric acid (C12H24O2).







     (c)   Reaction of hydrofluoric acid with magnesium hydroxide.






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









(8)  11.   Calculate the number of molecules in 21.4 g of methyl alcohol,
           CH4O.











(10) 12.   A compound containing only carbon, hydrogen and oxygen was
           shown by combustion analysis to consist of 62.1% C and 10.3%
           H.  What is its empirical formula?












     13.   Given the following chemical equation:

           2 HBr  +  Ca(OH)2  ----->   CaBr2   +   2 H2O


(8)  (a)   4.25 g of HBr are dissolved in water and the solution is
           titrated with a solution of Ca(OH)2.  The titration requires
           55.3 mL of the Ca(OH)2 solution.  What is the molarity of the
           Ca(OH)2 solution?












(6)  (b)   32 mL of a solution of 0.25 M Ca(OH)2 is mixed with 42 mL of
           a solution of 0.25 M HBr.  Which is the limiting reagent? 
           (Show your work).









(6)  (c)   In part (b) above, how many grams of CaBr2 will be formed?









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