CHE 105           HOUR EXAMINATION I           13 September 1994
Department of Chemistry                                  University of Kentucky

1.  Provide the name and symbol for an element that is in the same group
    as calcium.

     A.  Be, bentium
     B.  Sc, scandium
     C.  Br, barium
     D.  Ra, radium


2.  In each of the following, there is an underlined property.  Select the
    response for which that property is both extensive and physical.

     A.  Mercury is a silvery liquid.
     B.  The density of aluminum is 2.70 g/cc.
     C.  A sample of water has a mass of 28 grams.
     D.  Sodium and chlorine react to form table salt.


3.  Which of the following are pure substances ?
                      1.  brass          5.  coffee beans
                      2.  seawater       6.  oxygen gas
                      3.  ice            7.  exhaust gas from cars
                      4.  diamond        8.  carbon dioxide

      A.  1, 2, 5, 7
      B.  3, 4, 6, 8
      C.  1, 5, 6, 7
      D.  1, 5, 6, 8


4.  A chemist, upon observation of a sample of matter, notes the
    material appears to be uniform throughout and cannot be separated
    by any physical means.  The sample is

     A.  a homogeneous mixture.
     B.  a compound.
     C.  an element.
     D.  a compound or an element.


5.  What temperature on the Fahrenheit scale corresponds to 0 K ?

     A.  -459.7oF
     B.  -119.8oF
     C   -241.2oF
     D.  -523.7oF


6.  What is the volume of 2.0 g of lead ?  The density of lead is 11.4 g/cc.

     A.  5.7 cc
     B.  1.8 x 10-4 L
     C.  0.18 L
     D.  22.8 cc


7.   Each of the following numbers contains digits which are zero.
         1.  0.056        2.  560.0            3.  5.60         4.  1.056
     Which number(s) contain zeros that are definitely not significant ?

     A.  1 and 3
     B.  1
     C.  2 and 3
     D.  1 and 4


8.  Evaluate the following, giving proper regard to the rules for significant
    digits.
                             (6.2 x 103 + 1.2 x 104) / 10.00

     A.  1.82 x 103
     B.  7.4 x 107
     C.  1.82 x 104
     D.  1.8 x 103


9.  The diameter of an atom is approximately 1 x 10-8 cm.  How many
    nanometers is this ?

     A.  1 x 10-15 nm
     B.  1 x 10-10 nm
     C.  1 x 10-1 nm
     D.  1 x 101 nm


10. One of the major challenges presented to chemists during World
    War II was to develop a method to separate 235U from 238U.
    This task was difficult because

     A.  they are both very heavy elements.
     B.  both contain over 100 neutrons in their nuclei.
     C.  neither isotope of uranium will chemically react with anything.
     D.  the two isotopes of uranium have nearly identical chemical properties.


11.  Which of the following can conduct electrical current ?
     1. MgCl2 solid                5. CO dissolved in water
     2. MgCl2 dissolved in water   6. melted NaOH
     3. melted MgCl2               7. melted sulfur
     4. sugar dissolved in water   8. sodium solid

      A.  1,4,5,7
      B.  2,4,5,8
      C.  2,3,6,8
      D.  1,3,6,7


12.  How many protons, electrons, and neutrons are in 35Cl- ?

      A.  17 protons, 18 electrons, and 35 neutrons.
      B.  35 protons, 35 electrons, and 35 neutrons.
      C.  17 protons, 18 electrons, and 18 neutrons.
      D.  17 protons, 17 electrons, and 18 neutrons.


13.  Deuterium is a stable isotope of hydrogen.  The deuterium nucleus
     is correctly represented by the symbol

      A.  1H+
      B.  2H+
      C.  3H-
      D.  1He+


14.  The correctly written formula for the molecular compound dinitrogen
     pentoxide is

      A.  2 NO5
      B.  N5O2
      C.  (N2O)5
      D.  N2O5


15.  The correct formula for ammonium dichromate is

      A.  (NH4)2CrO4
      B.  N2H5CrO7
      C.  NH4ClO4
      D.  (NH4)2Cr2O7


16.  The empirical formula of manganese(III) sulfate is

      A.  Mn2(SO4)3
      B.  Mn2(SO3)3
      C.  Mg3SO4
      D.  Mn3SO4


17.  Which one of the following lists contain a monatomic ion, a diatomic
     ion, and a triatomic ion ?

      A.  sulfide ion, cyanide ion, nitrite ion
      B.  nitrate ion, permanganate ion, hydronium ion
      C.  oxide ion, perchlorate ion, phosphate ion
      D.  hydroxide ion, nitrate ion, dichromate ion


18.  When the reaction
         C3H5N3O9  =  N2  +  CO2  +  H2O  +  O2
     is balanced so that the coefficient of C3H5N3O9 is 4,
     the coefficients of CO2, H2O, and O2 will be

      A.  12, 10, 2
      B.  12, 10, 1
      C.  6, 5, 1/2
      D.  6, 5, 2


19.  How many atoms are in 4.0 x 10-2 g of aluminum ?

      A.  4.0 x 1027
      B   6.5 x 1023
      C.  8.9 x 1020
      D.  2.4 x 1022


20.  Which of the following statements is/are false ?

      A.  The molar mass of a substance is the mass in grams of one mole
          of that substance.
      B.  The atomic mass unit is the mass of one 12C atom.
      C.  The stoichiometrically calculated mass of a reaction product is
          the theoretical yield.
      D.  Both B and C.


21.  How many molecules of O2 are produced by the decomposition
     of 0.82 moles of KClO3 ?
               2 KClO3  =  2 KCl  +  3 O2

      A.  7.4 x 1023
      B.  6.022 x 1023
      C.  0.82
      D.  1.23


22. What is the percentage, by mass, of oxygen in C4H6O2 ?

      A.  2%
      B.  86.09%
      C.  37.169%
      D.  16.667%


23.  1.000 g of sucrose (C12H22O11) is completely burned in a stream of O2.
     How much CO2 and H2O (in grams), respectively, are produced
     in this combustion reaction ?

               C12H22O11  +  12 O2  =  12 CO2  +  11 H2O

      A.  1.543 g, 0.5790 g
      B.  15.79 g, 5.430 g
      C.  0.1286 g, 0.05264 g
      D.  12.00 g, 11.00 g


24.  Calculate the mass of CO2 produced from burning 2.54 g of propylene,
     C3H6.

      A.  7.97 g
      B.  2.66 g
      C.  3.99 g
      D.  1.33 g


25.  In the balanced reaction

        6 HCl  +  5 KI  +  KIO3  =  3 I2  +  6 KCl  +  3 H2O,

     6 moles of I2 are formed from an initial reaction mixture
     of 20 moles of HCl, 10 moles of KI, and 5 moles of KIO3.  Which
     is the limiting reactant ?

      A.  HCI
      B.  KI
      C.  KIO3
      D.  The limiting reactant cannot be identified from the information provided.