Chemistry 122  T                                  Spring 2004                             Oregon State University

Practice Exam 1                                                                                   Drapela

 

 

DO NOT OPEN THIS EXAM UNTIL INSTRUCTED.

CALCULATORS ARE NOT ALLOWED.

 

 

 

Instructions:

 

1. Fill in your last name, first name, and middle initial, and the corresponding bubbles.

2. Fill in your student ID number, and the corresponding bubbles.

3. CLASS SECTION NUMBER:  Leave blank.

4. TEST FORM NUMBER:  Leave blank.

5. Wait until instructed to begin test.

 

 

 

This exam consists of 25 multiple-choice questions, worth 4 points each.  Select the best answer by filling in the corresponding circle on the rear page of the answer sheet.

 

If you have any questions during the exam, please raise your hand to attract the attention of a proctor.  The proctor will come to you.  You may keep the exam when you are finished, so please mark the answers you selected on it.

 

Good luck!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. Which element below has the electron configuration 1s22s22p5?
    1. B
    2. N
    3. F
    4. P
    5. Cl

 

  1. Which of the following elements in the ground state is predicted to be paramagnetic?
    1. Sr
    2. Ar
    3. O
    4. Be
    5. Zn

 

  1. Samariam (atomic number 62) has a partially-filled…
    1. 5s orbital
    2. 4d orbital
    3. 5d orbital
    4. 4f orbital
    5. 5f orbital

 

  1. How many unpaired electrons would be predicted for the ground state of Vanadium?
    1. 0
    2. 1
    3. 2
    4. 3
    5. 4

 

  1. Which electron configuration below is correct for Indium?
    1. [Kr]5s25d105p1
    2. [Kr]5s24d105p1
    3. [Xe]5s25p1
    4. [Xe]5p1
    5. none of the above

 

  1. Which of the following atoms has the largest radius?
    1. Li
    2. F
    3. Cs
    4. Rn
    5. Fe

 

  1. Which of the following species has the smallest radius?
    1. Na
    2. Cl
    3. Cl−
    4. Br
    5. Fe

 

  1. Which of the following forms the largest ion?
    1. H
    2. Mg
    3. Rb
    4. F
    5. I

 

  1. The fluoride ion (F−) is isoelectric with which of the following?
    1. Na+
    2. Cl−
    3. He
    4. S2−
    5. Ar

 

  1. “Ionization energy” refers to the energy needed to…
    1. separate protons from neutrons
    2. remove an electron from an atom
    3. remove an electron from an ion
    4. push two electrons together
    5. form an ion from a Noble Gas

 

  1. Which of the following atoms has the largest ionization energy?
    1. Mg
    2. S
    3. Sr
    4. Te
    5. He

 

  1. When aluminum forms an ion, it acquires an electron configuration identical to:
    1. Ne
    2. Na
    3. Si
    4. Ar
    5. Ga

 

  1. Orbitals which are ________ are most stable.
    1. straight
    2. curved
    3. full
    4. large
    5. both (b) and (d)

 

  1. The Co2+ ion contains how many electrons in its 3d orbitals?
    1. 0
    2. 1
    3. 2
    4. 3
    5. 7

 

  1. The Lewis symbol for nitrogen (N) has how many pairs of electrons?
    1. 0
    2. 1
    3. 2
    4. 3
    5. 4

 

  1. In a Si−Cl bond, which atom possesses a greater share of electron density?
    1. Si
    2. Cl
    3. both equal
    4. depends on which isotopes are used
    5. impossible to know from data given

 

  1. Which bond below is the most polar?
    1. C−C
    2. C−H
    3. F−F
    4. N−O
    5. N−F

 

  1. When the correct Lewis structure is drawn for TeF4, how many non-bonding electrons should be placed on Te?
    1. none
    2. 1
    3. 2
    4. 3
    5. 4

 

  1.  Which of the following Lewis structures is correct for AsH4+?

 

            a.                                 b.                                 c.                                 d.

                                                                 

                       

 

  1. What is the formal charge on bromine in the ion below?

    1. 0
    2. +1
    3. −1
    4. +2
    5. −2

 

  1. Which of the following Lewis structures for the chlorite ion contains the least formal charges?

 

a.                           b.                                 c.                                 d. both (a) and (c)

                            e. all the same

                                                                             

 

  1. How many equivalent resonance structures can be drawn for the nitrate ion (NO3−)?
    1. 0
    2. 1
    3. 2
    4. 3
    5. 4         

 

  1. Considering the nitrate ion (NO3−) and the nitrite ion (NO2−), which has longer N−O bonds?
    1. nitrate
    2. nitrite
    3. both the same

 

  1. What is the bond order of the oxygen-oxygen bonds in ozone?
    1. 1
    2. 1.3
    3. 1.5
    4. 2
    5. 3

 

  1. Which is true about the resonance depicted below?

 

 

    1. The structures are rapidly interconverting
    2. A is more stable than B
    3. B is more stable than A
    4. Neither structure really exists
    5. All carbon-hydrogen bond orders are 1.3