Self Assessment A


1	Which one of the following compounds is most likely to be ionic?
		A)	HNF₂
		B)	H₂CO
		C)	N₂H₄
		D)	CaCl₂
		E)	ICl


2	Based on ionic radii and charges, which of the following solids would have the greatest lattice energy?
		A)	SrO
		B)	CsI
		C)	MgCl₂
		D)	KF
		E)	NaF


3	In Ba(CN)₂, the bonding is
		A)	essentially ionic.
		B)	essentially covalent.
		C)	both ionic and covalent.
		D)	neither ionic nor covalent.


4	Which of the following represents the most polar bond?
		A)	B-C
		B)	S-O
		C)	C-O
		D)	B-O
		E)	C-C


5	Which of the Lewis structure(s) is(are) incorrect?
		A)
		B)
		C)
		D)
		E)	C and D.


6	All of the following molecules contain only single bonds except
		A)	H₂O₂
		B)	Cl₂
		C)	CH₄
		D)	H₂O
		E)	SO₂


7	The formal charge on the nitrogen atom in the nitrate ion is
		A)	+2
		B)	+1
		C)	0
		D)	-1
		E)	-2


8	The sulfate ion is tetrahedral with four equal S-O distances of 149 pm. Which of the following is the most reasonable structure consistent with these facts?
		A)
		B)
		C)
		D)	None of the above.


9	In which of the following species does the central atom violate the octet rule?
		A)	CH₄
		B)	SF₄
		C)	PCl₄⁺
		D)	CCl₃⁺
		E)	NH₃


10	Estimate the enthalpy change for the reaction C₂H₄(g) + H₂(g) ----> C₂H₆(g), given the following bond energies: BE(H-H) = 436 kJ/mol; BE(C-H) = 414 kJ/mol; BE(C-C) = 347 kJ/mol; BE(C=C) = 620 kJ/mol.
		A)	-119 kJ
		B)	+119 kJ
		C)	-392 kJ
		D)	+392 kJ
		E)	None of the above.

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