Chemistry: Molecular Nature of Matter and Change, 6th Edition (Silberberg)

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1			Which species has one lone pair on the chlorine atom?
			A)	ClO-
			B)	ClO2-
			C)	ClO3-
			D)	ClO4-
			E)	HCl
2			In the Lewis structure of ethylene glycol, HOCH2CH2OH, how many pairs of electrons are bonding and how many are non-bonding?
			A)	11 bonding, 0 non-bonding
			B)	9 bonding, 2 non-bonding
			C)	8 bonding, 2 non-bonding
			D)	8 bonding, 4 non-bonding
			E)	9 bonding, 4 non-bonding
3			How many resonance forms are required to represent the acetate ion H3CCO2-?
			A)	1
			B)	2
			C)	3
			D)	4
			E)	more than 4
4			What is the NO bond order in H3CNO2 (assume all atoms obey the octet rule)?
			A)	1
			B)	2
			C)	1.33
			D)	1.5
			E)	3
5			What is the formal charge on the nitrogen in hydroxylamine, H2NOH?
			A)	-2
			B)	-1
			C)	0
			D)	+1
			E)	+2
6			Consider the resonance forms of the carbonate ion (CO32-) and determine the average charge on each oxygen.
			A)	0
			B)	1
			C)	-1
			D)	-2/3
			E)	-1/2
7			In which of the following species is the octet rule violated by the central atom?
			A)	CH4
			B)	SF4
			C)	PCl4+
			D)	SO2
			E)	NH3
8			Estimate the standard enthalpy change ΔH° for the reaction below: C2H4(g) + H2(g) → C2H6(g) Data: Bond energies in kJ/mol: H-H, 432; C-H, 415; C-C, 345; C=C, 615
			A)	-280 kJ
			B)	-180 kJ
			C)	-128 kJ
			D)	+974 kJ
			E)	-228 kJ
9			Estimate the standard enthalpy change ΔH° for the reaction below: 2H2(g) + O2(g) → 2H2O(g) Data: Bond energies, in kJ/mol: H-H, 432; O=O, 494; H-O, 459
			A)	-239 kJ
			B)	+239 kJ
			C)	-478 kJ
			D)	+478 kJ
			E)	None of the above.
10			Which of the following has the smallest bond angles?
			A)	CO2
			B)	SO2
			C)	SO3
			D)	SO42-
			E)	XeF4
11			Which of the following has the smallest bond angles?
			A)	H2O
			B)	NH3
			C)	CH4
			D)	H3O+
			E)	NH4+
12			Given that the F-Cl-F bond angles in ClF3 are 180° and 90°, predict the geometry of the molecule.
			A)	seesaw
			B)	trigonal pyramidal
			C)	trigonal planar
			D)	tetrahedral
			E)	none of the above
13			In the hemoglobin molecule which carries oxygen molecules in blood, iron has 6 single bonds to surrounding atoms. What is the most likely geometry of these bonds to iron?
			A)	planar
			B)	linear
			C)	tetrahedral
			D)	octahedral
			E)	trigonal pyramidal
14			According to VSEPR model, which of the following correctly lists electron-pair repulsions from the strongest to the weakest?
			A)	lone pair - bonding pair > lone pair - lone pair > bonding pair - bonding pair
			B)	bonding pair - bonding pair > lone pair - lone pair > lone pair - bonding pair
			C)	lone pair - lone pair > bonding pair - bonding pair > lone pair - bonding pair
			D)	lone pair - lone pair > lone pair - bonding pair > bonding pair - bonding pair
			E)	bonding pair - bonding pair > lone pair - lone pair > lone pair - bonding pair
15			Which molecule has no dipole moment?
			A)	H2O
			B)	XeF4
			C)	CO
			D)	SO2
			E)	BrF3