Chemistry (Chang), 10th Edition

Chapter 10: Chemical Bonding II- Molecular Geometry and Hybridization of Atomic Orbitals

Self Assessment A

Your Results:

The correct answer for each question is indicated by a .

1			The bond angles in the H3O+ ion are:
			A)	120o
			B)	90o, 120o
			C)	109o
			D)	90o
			E)	180o
2			Which of the following molecules is not planar?
			A)	BCl3
			B)	ClF3
			C)	PCl3
			D)	XeF4
			E)	All the compounds above are planar.
3			Which of the following has the smallest bond angles?
			A)	CO2
			B)	SO2
			C)	SO3
			D)	SO42-
			E)	The bond angles in each of these substances are the same.
4			Which of the following molecules has a dipole moment?
			A)	H2
			B)	CO2
			C)	F2
			D)	SO2
			E)	BF3
5			Determine the hybridization of the central atom in the compound PCl5.
			A)	sp3d
			B)	sp3
			C)	sp3d2
			D)	sp
			E)	sp2
6			Which of the following molecules has a dipole moment and a central atom with sp3 hybridization?
			A)	CCl4
			B)	BF3
			C)	CHCl3
			D)	BrF3
			E)	C2H4
7			The lone pair of electrons on the sulfur atom in SO2 is in:
			A)	a p orbital
			B)	an s orbital
			C)	an sp3 hybrid orbital
			D)	an sp2 hybrid orbital
			E)	None of the above
8			What is the bond order for the species O2-?
			A)	1
			B)	1.5
			C)	2
			D)	2.5
			E)	None of the above
9			According to the molecular orbital model, which of the species below is the least stable?
			A)	Li2
			B)	B2
			C)	C2
			D)	O2
			E)	He2
10			Which of the following molecules has delocalized molecular orbitals?
			A)	H2O
			B)	C6H6
			C)	C2H2
			D)	CH3OH
			E)	None of the above have delocalized molecular orbitals.
11			What would be the predicted geometry for the simple molecule AB5E?
			A)	Octahedral
			B)	Square pyramidal
			C)	T-shaped
			D)	Distorted tetrahedron
12			Which hybridization is incorrectly paired with its shape?
			A)	sp2: equilateral triangle
			B)	sp3: tetrahedron
			C)	sp3d: trigonal pyramidal
			D)	sp3d2: octahedron
13			When molecules which exhibit separation of charges are placed in an electric field, they become oriented positive end to negative plate and negative end to positive plate.
			A)	True
			B)	False
14			Which statement is false concerning dipole moments?
			A)	They are always positive.
			B)	Dipole moments can be used to distinguish isomers from one another.
			C)	Dipole moments are present in molecules with linear and bent geometry.
			D)	Presence or absense of dipole moments cannot be predicted.

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