CHM 100                                                                   Fall 1998                                                        Quiz 3 

c = 3.0 x 108 m/s;          h = 6.63 x 10-34 J.s;                 R = 2.18 x 10-18 J

 

1.  A microwave oven emits electromagnetic waves that follow the same equations as light waves, but the wavelength is 2.85 cm.  What is the frequency of these waves?

 

a.  3.0 x 1014 s-1            b.  4.5 x 1013 s-1           c.  2.8 x 1012 s-1            d.  1.1 x 1010 s-1           e.  9.5 x 10-9 s-1

 

 

 

 

2.   How much energy (in J) is required to completely remove an electron from the 4th main level of a hydrogen atom?

 

a.  1.1 x 10-18               b.  5.45 x 10-19             c.  1.36 x 10-19             d.  8.52 x 10-21             e.  3.97 x 10-22

 

 

 

 

 

3.  Which of the above transitions (a, b, c, d, or e) is associated with the line labeled “4” in the spectrum?

 

 


 

 

 

 

 

           

 

 

 

4. The ground state electronic configuration for 25Mn, with sublevels in order of increasing energy, is best represented as

 

a.  1s2 2s2 2p6 3s2 3p6 4s2 4p5                           b.  1s2 2s2 2p6 3s2 3p6 3d5 4s2

c.  1s2 2s2 2p6 3s2 3p6  4s2 3d5                          d.  1s2 2s2 2p6 3s2 3p6  4s2 4d5

e.  1s2 2s2 2p6 3s2 3p6  4s2 4p6 3d5

 

5.  If a standing wave with 2 nodes is drawn between two “walls” 12 cm apart, what is the wavelength?

 

a.  12 cm                      b.  8 cm                        c. 6 cm                         d.  4 cm                        e.  3 cm

 

 

 

 

 

 

6.  How many electrons may have the quantum numbers n = 6, l = 2?

a.  0                 b.  2                 c.  5                 d.  10               e.  18

 

7.  Which of the following atoms or ions would not be paramagnetic?

 

a.  P                 b.  Fe 2+                       c.  N                d.  O                e.  Li+

 

8.  Which of the following has the highest ionization energy?

a.   49In            b.  31Ga            c. 32 Ge                        d.  33As                        e.  52Te

 

9.  Which elements in period 4 would have electronic structures which impart unexpectedly high first ionization energies, when compared with the “usual” trends?

 

a.  K, Ge, Se, Br                      b.  Ca, Mn, Zn, As                   c.  Cr, Ga, Se               d. Ti, Co, Br

 

 

10.  In which choice are the compounds listed in order : first most ionic, then polar covalent, an finally nonpolar covalent?

 

a.  KBr, HBr, ClBr, Br2    b. ClBr, KBr, HBr, Br2        c. ClBr, HBr,  KBr, Br2            d. ClBr, Br2, HBr, KBr,

 

11.  How many bonding electrons and nonbonding  electrons (in “unhared pairs) appear in the Lewis structure for N2?

            # Bonding e’s               # Nonbonding e’s (in unshared pairs)   

a.         2                                  8

b.         2                                  4

c.         2                                  6

d.         4                                  6

e.         6                                  4

 

12.  Which processes are generally favorable (release energy) in the formation of an ionic compound?

 

a.  Ionization Potential and Electron Affinity

b.  Electron Affinity and Lattice Energy

c.  Dissociation energy and Electron Affinity

d.  Sublimation energy and lattice energy          

e.  Ionization Potential and lattice energy