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					Chemistry 115                                                                                                        Name
Dr. Cary Willard
Exam 2C                                                                                                              March 18, 2009


                                                                          Points Earned                                    Points Possible
         Page 1                                                                                                            20
         multiple choice
         Page 2                                                                                                            24
         Page 3                                                                                                            26
         Page 4                                                                                                            24
         Page 5                                                                                                            12
         Total                                                                                                             106


Note: All work must be shown to receive credit. On calculation problems show answer with the correct
number of significant figures using scientific notation if necessary.

Avogadro’s number 6.022 x 1023/mol

                                                                     PERIODIC CHART



                                                                                                                                                   NOBLE
  IA                                                                                                                                          VIIA GASES
   1                                                                                                                                           1      2
  H      IIA                                                                                              IIIA      IVA      VA      VIA       H    He
1.008                                                                                                                                        1.008 4.002
   3      4                                                                                                5     6            7       8        9     10
  Li     Be                                     Transition Metals»                                         B     C            N       O        F    Ne
6.941   9.012                                                                                            10.81 12.01        14.01   16.00    19.00 20.18
 11      12                                                                                               13        14       15      16       17       18
 Na      Mg      IIIB   IVB      VB     VIB        VIIB           ÉÍÍÍVIIIBÍÍÍÍ»        IB       IIB      Al        Si        P       S       Cl       Ar
23.00   24.30                                                                                            27.00     28.09    30.97   32.06    35.45    39.95
 19      20      21      22      23      24        25        26       27       28       29      30        31        32       33      34       35       36
  K      Ca      Sc      Ti       V      Cr        Mn        Fe       Co       Ni       Cu      Zn        Ga        Ge       As      Se       Br       Kr
39.10   40.08   44.96   47.90   50.94   52.00     54.94     55.85    58.93    58.70    63.55   65.38     69.72     72.59    74.92   78.96    79.90    83.80
 37      38      39      40      41      42         43       44       45       46       47      48        49        50       51      52       53       54
 Rb      Sr       Y      Zr      Nb      Mo         Tc       Ru       Rh       Pd       Ag      Cd        In        Sn       Sb      Te        I       Xe
85.47   87.62   88.91   91.22   92.91   95.94      (99)     101.1    102.9    106.4    107.9   112.4     114.8     118.7    121.8   127.6    126.9    131.3
 55      56      57      72      73      74        75        76       77       78       79      80        81        82       83       84        85     86
 Cs      Ba      La      Hf      Ta      W         Re        Os        Ir      Pt       Au      Hg        Tl        Pb       Bi      Po         At     Rn
132.9   137.3   138.9   178.5   180.9   183.9     186.2     190.2    192.2    195.1    197.0   200.6     204.4     207.2    209.0   (209)     (210)   (222)
 87      88      89      104     105     106       107       108       109      110
  Fr     Ra      Ac       Rf     Db      Sg        Bh        Hs        Mt       ??
(223)   226.0   227.0   (261)   (262)   (263)     (262)     (265)     (268)    (???)




                                               58          59      60        61      62        63        64        65       66      67       68      69      70     71
Lanthanide series                              Ce          Pr      Nd       Pm      Sm        Eu        Gd        Tb       Dy      Ho        Er     Tm      Yb      Lu
                                              140.1       140.9   144.2    (147)   150.4     152.0     157.3     158.9    162.5   164.9    167.3   168.9   173.0   175.0
                                               90          91      92        93      94        95        96        97       98      99      100     101     102     103
                                               Th          Pa       U       Np      Pu        Am        Cm        Bk        Cf     Es       Fm      Md      No       Lr
Actinide series                               232.0       231.0   238.0    (237)   (244)     (243)     (247)     (247)    (251)   (252)    (257)   (258)   (259)   (260)
Part 1 - Multiple Choice (20 points)


1. Each atom of a specific element has the       7. The reaction
   same                                          BaCl2 + (NH4)2CO3  BaCO3 + 2 NH4Cl
   a. Atomic mass                                    is an example of
   b. Mass number                                   a. A combination reaction
   c. Number of protons                             b. A decomposition reaction
   d. Number of neutrons                            c. A single displacement reaction
   e. None of the above                             d. A double displacement reaction

2. What charge does an anion possess?            8. The reaction
   a. Positive                                               2 PbO2  2 PbO + O2
   b. Negative                                      is an example of
   c. Neutral                                       a. A double displacement reaction
   d. Unable to determine                           b. A single displacement reaction
                                                    c. A decomposition reaction
3. Which pair of symbols represents isotopes?       d. A combination reaction
   a.      and                                      e. Unable to determine
   b.       and
   c.      and
   d.    and                                     Given the activity series Mg>Zn>Cu>Ag,
   e.                                            predict the products of the following reactions.

4. The mass of an atom is primarily              9. Mg + Cu(NO3)2 
   determined by the mass of its                    a. Mg(NO3)2 + Cu
   a. Protons                                       b. MgNO3 + Cu
   b. Neutrons                                      c. MgCu + 2 NO3
   c. Electrons                                     d. No reaction
   d. Both protons and neutrons                     e. Unable to determine based on
   e. Both neutrons and electrons                      information provided

5. An atom of atomic number 53 and mass          10. Ag + Zn(NO3)2 
   number 127 contains how many neutrons             a. AgNO3 + Zn
   a. 74                                             b. Ag(NO3)2 + Zn
   b. 180                                            c. Ag2Zn + NO3
   c. 53                                             d. No reaction
   d. 127                                            e. Unable to determine based on
                                                        information provided
6. Which of the following contains the largest
   number of moles?
   a. 1.0 go Na
   b. 1.0 g Li
   c. 1.0 g Al
   d. 1.0 g Ag
Part 2 – Nomenclature (8 points) Fill in the following table with the correct IUPAC name or
formula

          IUPAC Name                                               Chemical Formula
Aluminum periodate
Manganese(II) chloride
Ammonium iodate
Sodium borate
                                                             Mg(NO3)2
                                                             K3P
                                                             Zn(OH)2
                                                             CS2

Part 3 – Problems (68 points)

1.   (4 points) What particles in an atom contain practically all of its mass?




2. (4 points) How is it possible for there to be more than one kind of atom of the same element?




3. (4 points) Explain why the name for MgCl2 is magnesium chloride but the name for CuCl2 is
   copper(II) chloride.




4.    (4 points) What is meant by the physical state of a substance? What symbols are used to
     represent these physical states and what does each symbol mean?
5.   (6 points) Balance the equations below


     a.           P4 +               Cl2                   PCl5



     b.            H2TeO4 +              V(OH)3                H2O +           V2(TeO4)3



6.    (20 points) Given a 8.55 g sample of the acetylsalicylic acid (C9H8O4) or aspirin, calculate
     the following:
     a. molar mass of aspirin




     b. moles of aspirin




     c. moles of carbon atoms




     d. molecules of phenylalanine




     e. number of oxygen atoms
7. (24 points) Trinitrotoluene, C7H5N3O6, is an explosive otherwise known as TNT. The
   equation for its combustion is
          4 C7H5N3O6 + 33 O2  28 CO2 + 10 H2O + 6 N2

   a. How many moles of oxygen are required to react with 8.27 mol C7H5N3O6?




   b. How many grams of carbon dioxide will be produced when 4.04 mol of C7H5N3O6 are
      burned?




   c. If 1090 grams of CO2 are produced in part b, what is the percent yield of the reaction?




   d. How many molecules of TNT will react with 165 molecules of oxygen gas?




   e. How many molecules of water will be produced by the combustion of 4.00 g of butane?




   f. How many moles of CO2 will be produced by the reaction of 5.00 moles of TNT with
      47.0 moles of oxygen gas?
8. (7 points) Calculate the empirical formula of eugenol or oil of clove which is composed of
   73.19% C, 7.37% H, and 19.49% O.




9. (5 points) A compound with empirical formula C2H4O has a molar mass of 176 g/mol.
   Determine the molecular formula for the compound.

				
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