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Chemistry, 7/e
Raymond Chang, Williams College

Chemical Bonding I: Basic Concepts

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)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif:: ::/sites/dl/free/0073656011/17477/ch9quizaq5a.gif','popWin', 'width=86,height=62,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>
B)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif:: ::/sites/dl/free/0073656011/17477/ch9quizaq5b.gif','popWin', 'width=87,height=65,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>
C)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif:: ::/sites/dl/free/0073656011/17477/ch9quizaq5c.gif','popWin', 'width=101,height=60,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>
D)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif:: ::/sites/dl/free/0073656011/17477/ch9quizaq5d.gif','popWin', 'width=97,height=45,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>
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)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif:: ::/sites/dl/free/0073656011/17477/ch9quizaq8a.gif','popWin', 'width=155,height=134,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>
B)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif:: ::/sites/dl/free/0073656011/17477/ch9quizaq8b.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>
C)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif:: ::/sites/dl/free/0073656011/17477/ch9quizaq8c.gif','popWin', 'width=151,height=128,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>
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.