CHEMISTRY

8. Which of the following substances is/are bent?

(i)  H2S      (ii).  CO2      (iii)  ClNO     (iv)  NH2    (v)  O3

 

  A) only (iii)
  B) only (i) and (v)
  C) only (i), (iii), and (v)
  D) all are bent except for (iv)
  E) all are bent except for (ii)

 

 

9. Which of the following molecules is polar?

 

  A) CH4
  B) SF6
  C) F2
  D) CH3F
  E) CO2

 

10. Indicate the type of hybrid orbitals used by the central atom in TeF4.
  A) Sp
  B) sp2
  C) sp3
  D) sp3d
  E) sp3d2

 

11. The hybridization of the O atom in CO2 will be
  A) S
  B) Sp
  C) sp2
  D) sp3
  E) sp3d

 

12. The number of pi bonds in the molecule below is

   

A)

 

1

  B) 2
  C) 3
  D) 5
  E) 9

 

IMF’s

13.     Order the forces (dipole-dipole, London dispersion, ionic, and hydrogen-bonding) from weakest to strongest .

a)       dipole-dipole, London dispersion, ionic, and hydrogen-bonding

b)       London dispersion, dipole-dipole, hydrogen-bonding, and ionic

c)       hydrogen-bonding, dipole-dipole, London dispersion, and ionic

d)       dipole-dipole, ionic, London dispersion, and hydrogen-bonding

e)       London dispersion, ionic, dipole-dipole, and hydrogen-bonding

 

14.     Which of the following would you expect to have the highest boiling point?

a)       F2

b)       Cl2

c)       Br2

d)       I2

e)       All of the above have the same boiling point.

 

15.     The molecules in a sample of SO2 are attracted to each other by a combination of

a)       London forces and H-bonding

b)       H-bonding and ionic bonding

c)       covalent bonding and dipole-dipole interactions

d)       London forces and dipole-dipole interactions

e)       none of these

 

16.     When a water molecule forms a hydrogen bond with another water molecule, which atoms are involved in the interaction?

a)       a hydrogen from one molecule and a hydrogen from the other molecule

b)       a hydrogen from one molecule and an oxygen from the other molecule

c)       an oxygen from one molecule and an oxygen from the other molecule

d)       an oxygen and a hydrogen from the same molecule

e)       two hydrogens from one molecule and one hydrogen from the other molecule

 

Chemical Bonding and Geometry

 

17. Which formula is matched with the correct number of valence electrons in the free (not bonded) central atom, bonds, and lone pairs in the molecule for the underlined atom?

a. SeH2; 6 valence electrons, 2 bonds, and 1 lone pair

b. SiCl4; 4 valence electrons, 4 bonds, and 0 lone pairs

c. FCl; 1 valence electron, 1 bond, and 0 lone pairs

d. SCl2; 6 valence electrons, 2 bonds, and 0 lone pairs

e. PH3; 4 valence electrons, 3 bonds, and 1 lone pair

 

18. The electron-dot structure for the species NH4O+ contains

a. 1 double bond and 4 single bonds

b. 5 single bonds and 3 lone pairs.

c. 5 single bonds and 2 lone pairs.

d. 5 single bonds and 1 lone pair.

e. 5 single bonds and zero lone pairs.

 

19. What is the hybridization of the carbon atom in CO2?

a. sp2

                b. sp3

                c. sp3d

                d. sp3d2

                e. sp

 

20. Which of the following molecules requires two resonance hybrid Lewis structures to account for the bonding?

a.    SO2

b.   CO2

c.    O2

d.   CH4

e.    C2H4

 

21. Which of the following is the best electron-dot description for sulfur dioxide, SO2?

Description: http://www.chem.purdue.edu/gchelp/115exams/e3f982.gif

22. Which of the following compounds (or ions) contains an atom that does NOT follow the octet rule?

    1. BrF3
    2. CBr4
    3. NO+
    4. BF4
    5. NCl3

 

23. What is atom X in the Lewis structure of the following anion?

Description: http://www.chem.purdue.edu/gchelp/115exams/e4f973.gif

    1. Xe
    2. Cl
    3. S
    4. N
    5. C

24.  Which of the following statements is correct?

a. Covalent bonds usually involve two nonmetals and ionic bonds usually involve two metals.

b. Covalent bonds usually involve two metals and ionic bonds usually involve a metal and a nonmetal.

c. Covalent bonds usually involve a metal and a nonmetal and ionic bonds usually involve two nonmetals.

d. Covalent bonds usually involve two nonmetals and ionic bonds usually involve a metal and a nonmetal.

e. Covalent bonds usually involve two metals and ionic bonds involve two nonmetals.

 

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