Chem 121                                Sample Exam 3                        Name __________________

                                                                                                Dr. Drisko, Instructor

All work must be clearly shown where appropriate. Some data and equations you may or may not need: E=(hc)/l; h= 6.626 x 10-34 joule sec; c= 3 x 108 meters/sec; n = c/l

Schrodinger

  1. measured the charge to mass ratio of cathode ray particles
  2. measured the charge on the electron
  3. proposed the nuclear model of the atom
  4. suggested the energy of the electron is quantized
  5. proposed the theory that we call quantum mechanics
Which of the following colors in the visible spectrum has the highest energy?
  1. blue
  2. yellow
  3. green
  4. orange
  5. red
Which of the following orbital types have a probability profile that is spherically symmetrical about the nucleus?
  1. s
  2. p
  3. d
  4. f
  5. g
In the 3d subshell the maximum possible number of electrons is
  1. 2
  2. 6
  3. 10
  4. 14
  5. 18
In the second shell (n=2) the maximum possible number of electrons is
  1. 2
  2. 4
  3. 6
  4. 8
  5. 10
Which quantum number is shared by all the electrons in the shell?
  1. principal (n)
  2. angular momentum (l)
  1. magnetic (m or m l) 
  1. spin (s or ms)
  2. none of these
The possible m values for l = 1 are
  1. 0
  2. -1, 0,+1
  3. 0,1
  4. s,p,d,f
  5. none of these
The maximum number of electrons in any orbital is
  1. 2
  2. 6
  3. 10
  4. 14 
  5. there is no maximum
The ground state electron configuration of neodynium, atomic number 60 is
  1. 1s22s22p63s23p64s23d104p65s24d105p66s24f5
  2. 1s22s22p63s23p64s23d104p65s24d105p66s24f4
  3. 1s22s22p63s23p64s23d104p65s24d105p66s14f5
  4. 1s22s22p63s23p64s23d104p65s24d105p64f6
Which statement is true about the ground state of the Co+2.ion?
  1. The number of unpaired electrons is zero and the Co+2 ion is paramagnetic
  2. The number of unpaired electrons is zero and the Co+2 ion is not paramagnetic
  3. The number of unpaired electrons is three and the Co+2 ion is not paramagnetic
  4. The number of unpaired electrons is three and the Co+2 ion is paramagnetic
  5. The number of unpaired electrons is one  and the Co+2 ion is paramagnetic
. The Core for I is
  1. [Ar]
  2. [Br]
  3. [Kr]
  4. [Te]
  5. [Xe}
Choose the electron configuration that corresponds to an excited state:
  1. [Ar]3d34s2
  2. [Kr]5s1
  3. [Ar]3d54s1
  4. [Ne]3s13p6
  5. [Xe] 4f145d106s2
The general trend in atomic size from left to right across a period is
  1. increasing size
  2. decreasing size
  3. size is constant
  4. size varies in a random way
The general trend is size in going down a family from top to bottom is
  1. increasing size
  2. decreasing size
  3. size is constant
  4. size varies in a random way
. Se is a (an)
  1. s block element
  2. p block element
  3. d block element
  4. f block element
  5. g block element
Vanadium is a (an)
  1. s block element
  2. p block element
  3. d block element
  4. f block element
  5. g block element
Which of the following is a metal
  1. O
  2. N
  3. Br
  4. Ca
  5. Ar
The name commonly associated with the IA family (or group 1) is
  1. halogen family
  2. noble gas family
  3. alkaline earth family
  4. alkali metals
  5. none of these
Part II

1.a.   If n =6, what values are possible for l?

b.If l = 5, what values are possible for ml?

c.What is the subshell label (s,p,d,f, etc) if n = 6, l = 2, and ml= -1?

d.Give one set of 4 possible quantum numbers for an electron in the 6d orbital.

2.A popular AM radio station broadcasts at  a frequency of 650 kHz.  What is the wavelength in meters of the electromagnetic radiation emitted by this station?

3.a.   Sketch the orbital energy diagram (vertical orientation) including electrons for the S atom in its ground state.

  1. Write the complete electron configuration for the S 
4. Write the abbreviated orbital diagram (horizontal orientation) for the ground state of
  1. Al
  1. K
  1. Sn
  1. V
5.Write abbreviated electron configurations for each of the following and tell how many unpaired electrons each has
  1. boron
  1. fluorine
  1. silicon
6. How many unpaired electrons are in the ground state of each species?
  1. a scandium (Sc) atom
  1. a Sc3+ ion
  1. a titanium (Ti) atom
  1. a Ti2+ ion
7. Arrange each group of atoms in order of decreasing radius:
  1. Br, Cl, Se
  1. Al, Mg, Si
8. Which is larger in each part?
  1. H+ or H- ?
  1. H- or H?
  1. Fe2+ or Fe3+ ?
9. Which is (are) isoelectronic with Kr?
  1. Se2-
b.   Sr2+

c.   Zn2+

10. Which member of each pair has the higher value for first ionization energy?

  1. Mg or Na
  1. K or Na
  1. Ar or Cl
11. Draw Lewis Structures for the following:

a.PI3

b.CCl2O

c.C2H-1

12. a. Draw a Lewis structure for HClO3  (H is attached to one of the O’s).

           b. Use VSEPR to determine the geometry at the center Cl atom

c.Using electronegativity values, classify the following bonds as nonpolar (“pure”) covalent, polar covalent or ionic:

i.Cl – O

ii.O –H

d. Determine from your geometry and bond polarities whether HClO3 is a polar molecule or nonpolar. You must indicate your reasoning to get any credit for this portion of this question.