1
Created by Boundless
Which of the following best describes valence bond theory?
A
the repulsion between two valence orbitals with an
unpaired electron prevents bond formation
B
overlap between two valence orbitals with an unpaired
electron forms a covalent bond between two atoms
C
overlap between inner orbitals with an unpaired electron
forms a covalent bond between two atoms
D
the overlap between two valence orbitals with an unpaired
electron forms a ionic bond between two atoms
2
Created by Boundless
Which of the following best describes the process by which a ground state atom
becomes sp3 hybridized?
3
A
The s orbital and three p orbitals of the valence shell mix to
form four equivalent sp3 hybridized orbitals that are
chemically and geometrically identical
B
The s orbital and three p orbitals of the valence shell mix to
form four equivalent sp3 hybridized orbitals that are
chemically but not geometrically identical
C
The s orbital and three p orbitals of the innermost electron
shell mix to form four equivalent sp3 hybridized orbitals that
are chemically and geometrically identical
D
The s orbital and one of the p orbitals of the valence
electron shell mix to form four equivalent sp3 hybridized
orbitals that are chemically and geometrically identical
Created by Boundless
Assuming that the silicon atom of the molecule SiCl4 is sp3 hybridized, which of
the following best describes the geometry of this compound?
A
square
B
rhomboidal
C
triangular
D
tetrahedral
4
Created by Boundless
Assuming the aluminum atom of the molecule AlCl3 is sp2 hybridized, which of the
following best describes the geometry of this compound?
A
trigonal planar with Cl-Al-Cl bonds of approximately 120°
B
pyramidal with Cl-Al-Cl bonds of approximately 109.5°
C
square with Cl-Al-Cl bonds of approximately 90°
D
tetrahedral with Cl-Al-Cl bonds of approximately 109.5°
5
Created by Boundless
The molecule 1-propene has the structure H3C-CH=CH2 where the symbols "-"
and "=" signify a single and double bond, respectively. How many of the carbon
atoms of this molecule are sp2 hybridized?
A
0
B
1
C
3
D
2
6
Created by Boundless
Acetylene is the simple organic molecule HC ≡CH. Which of the following best
describes the H-C-C bond angle?
A
linear, 180°
B
bent, 109.5°
C
bent, 120°
D
bent, 180°
7
Created by Boundless
Predict the hybridization of the carbon atom in each of the following molecules:
formaldehyde (CH2O), formic acid (HCO2H), and carbon monoxide (CO).
A
formaldehyde: sp2, formic acid: sp3; carbon monoxide: sp2
B
formaldehyde: sp2, formic acid: sp2; carbon monoxide: sp
C
formaldehyde: sp3, formic acid: sp2; carbon monoxide: sp
D
formaldehyde: sp2, formic acid: sp2; carbon monoxide: sp2