Chemistry

In the Lewis symbol for a fluorine atom, there are __________ paired and __________ unpaired electrons.
A) 4, 2
B) 0, 5
C) 2, 5
D) 6, 1
E) 4,1
2.
Which of the following would have to gain two electrons in order to achieve a noble gas electron configuration?

O Sr Na Se Br
A) Sr
B) Br
C) Sr, O, Se
D) Na
E) O, Se
3.
The electron configuration of the S2- ion is __________.
A) [Ne]3s23p2
B) [Ne]3s23p6
C) [Kr]3s22p-6
D) [Ar]3s23p2
E) [Ar]3s23p6
4.
The ion NO- has __________ valence electrons.
A) 10
B) 16
C) 12
D) 14
E) 15
5.
The Lewis structure of PF3 shows that the central phosphorus atom has __________ nonbonding and __________ bonding electron pairs.
A) 3, 1
B) 3, 3
C) 2, 2
D) 1, 3
E) 1, 2
6.
The formal charge on nitrogen in NO3- is __________. A) -1
B) -2
C) +2
D) +1
E) 0
7.
How many equivalent resonance forms can be drawn for SO2 without expanding octet on the sulfur atom (sulfur is the central atom)?
A) 3
B) 1
C) 2
D) 4
E) 0
8.
Using the table of average bond energies below, the ΔH for the reaction is __________ kJ.

Bond: C≡C C-C H-I C-I C-H D (kJ/mol): 839 348 299 240 413
A) -63
B) -217
C) +160
D) -160
E) +63
9.
The molecular geometry of the CS2 molecule is __________.
A) trigonal planar
B) bent
C) T-shaped
D) linear
E) tetrahedral
10.
The molecular geometry of the PF4+ ion is __________.
A) trigonal planar
B) trigonal bipyramidal
C) tetrahedral
D) trigonal pyramidal
E) octahedral
11.
The Cl-Si-Cl bond angle in the SiCl2F2 molecule is approximately __________.
A) 90°
B) 109.5°
C) 180°
D) 60°
E) 120°
12.
The O-S-O bond angle in SO2 is slightly less than __________.
A) 109.5°
B) 120°
C) 180°
D) 60°
E) 90°
13.
The hybridization of orbitals on the central atom in a molecule is sp2. The electron-domain geometry about this central atom is __________.
A) trigonal planar
B) octahedral
C) linear
D) trigonal bipyramidal
E) tetrahedral
14.
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