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CHM 1025C: Spring Term 2008
On-Line PreFinal Module 4 II
Corwin Chapters 12

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Final Exam: Module 4 II and III

Final Exam Quiz Masters:

Mary Tassin (MTassin002@lsua.edu) [Text Input]

John Taylor (johtaylo@fscj.edu) [Consultant]


Multiple Choice [One Answer Only]

Steric Number = Number of Bonded atoms plus Lone Pairs:

S# Bond Angle Hybrid Orbital Type
4 109½o sp3 hybrid orbitals (4 total orbitals)
3 120o sp2 hybrid orbitals (3 total orbitals)
2 180o sp hybrid orbitals (2 total orbitals)
1 no angle s orbital (Only hydrogen has a S# of 1)

Question 1

Which of the following shows a general increasing trend for electronegativity in the periodic table?

a) down a group of nonmetals
b) across a series of metals from right to left
c) across a series of nonmetals from right to left
d) down a group of metals
e) none of the above

Question 2

Hydrogen has an electronegativity value of 2.1. Given the eletronegativity of N, O, and P (3.0, 3.5 and 2.1, respectively), predict which of the following has nonpolar bonds.

a) H2O
b) NH3
c) PH3
d) all of the above
e) none of the above

Question 3

What is the electron pair geometry for a methane molecule, CH4?

a) trigonal pyramidal
b) tetrahedral
c) bent
d) linear
e) none of the above

Question 4

What is the molecular shape of a water molecule, H2O?

a) tetrahedral
b) trigonal pyramidal
c) linear
d) bent
e) none of the above

Question 5

What is the electron pair geometry for an ammonia molecule, NH3?

a) bent
b) trigonal pyramidal
c) linear
d) tetrahedral
e) none of the above

Question 6

What is the electron pair geometry for a carbonate ion, CO32-?

a) trigonal planar
b) tetrahedral
c) linear
d) bent
3) trigonal pyramidal

Question 7

What type of bond is characterized by sharing two pairs of electrons?

a) triple bond
b) electrovalent bond
c) double bond
d) single bond
e) none of the above

Question 8

What is the term for the ability of an atom in a chemical bond to attract a shared electron pair?

a) dipole
b) electronegativity
c) polar attraction
d) delta value
e) none of the above

Question 9

Which of the following molecules would be nonpolar?

a) CHCl3
b) CCl4
c) H2O
d) NH3
e) CH3Cl

Question 10

What is the proper oreder of decreasing F-X-F angle in the compounds below?
(A) BF3 ........ (B) BeF2 ........ (C) CF4

Hint: Boron follows the rule of six not eight with a vacant pz orbital.
Beryllium follows the rule of four not eight with vacant py and pzorbitals.
Remember the VSEPR Movie!

a) A> B > C
b) B > C > A
c) C > B > A
d) B > A > C
e) C > A > B

Question 11

What is the proper order of increasing Cl - A - Cl angle.
(A) SCl2......(B) PCl3......(C) SiCl4
Hint: A lone pair or unshared pair decreases the bond angle by approximately 2o for each pair

a) A < B < C
b) A < C < B
c) C < A < B
d) C < B < A
e) B < C < A

Question 12

What is the shape of the CHCl3 (Chloroform) molecule?

a) trigonal planar
b) tetrahedral
c) trigonal pyramidal
d) bent
e) linear

Question 13

What is the approximate O-S-O bond angle in SO2?

a) 90o
b) 109o
c) 120o
d) 180o
e) 210o

Question 14

Which one of the following sets of molecules would have bond angles of 105o, 107o, and 109.5o respectively?

a) CH4,    H2O,    NH3
b) H2O,    NH3,   CH4
c) NH3,    H2O,    CH4
d) H2O,    CH4,    NH3
e) none of the above

Question 15

What is the approximate O-C-O bond angle in CO32-

a) 90o
b) 109o
c) 120o
d) 180o
e) none of the above



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