Chemistry (Chang), 10th Edition

Chapter 9: Chemical Bonding I- Basic Concepts

Self Assessment B

1
Which one of the following is most likely to form an anion in an ionic compound?
A)Al
B)N
C)O
D)C
E)Xe
2
What is the correct number of dots surrounding the Na symbol in the Lewis structure of Na+?
A)0
B)1
C)2
D)6
E)8
3
Which of the following equations represents the lattice energy of KCl(s)?
A)Cl2(g) + 2 K+(s) ----> 2 KCl(s)
B)2 KCl(s) ----> 2 K(s) + 2 Cl-(g)
C)KCl(s) ----> K(s) + Cl(g)
D)KCl(s) ----> K+(g) + Cl-(g)
E)None of the above.
4
The formula for a compound of Cl that contains both ionic and covalent bonds is:
A)CCl4
B)NaCl
C)NH4Cl
D)PCl3
E)CH3Cl
5
Which of the following has the correct Lewis structure?
A)H2O2: H:O:::O:H
B)
C2H2:<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0023654666/17477/ch9quizbq5a.gif','popWin', 'width=104,height=82,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>
C)
HCN:<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0023654666/17477/ch9quizbq5b.gif','popWin', 'width=96,height=83,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>
D)
KCl:<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0023654666/17477/ch9quizbq5c.gif','popWin', 'width=84,height=83,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>
E)
HCl:<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0023654666/17477/ch9quizbq5d.gif','popWin', 'width=84,height=83,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>
6
Which of the following chemical bonds would be the most polar?
A)H-O
B)H-C
C)N-S
D)N-Cl
E)C-O
7
Which of the following species are isoelectronic? 1) CH4 2) B3N3H6 3) N2 4) NH4+ 5) CO 6) C6H6
A)1) and 3); 2) and 6); 4) and 5)
B)2) and 6)
C)1) , 4) and 5)
D)1) and 4); 2) and 6); 3) and 5)
E)1) and 4); 3) and 5)
8
In which substance shown below does the central atom have the lowest formal charge? Assume that the Lewis structure for each species obeys the octet rule and ignore resonance.
A)NO3-
B)CO32-
C)SO3
D)ClO3-
9
When acting as a central atom, which of the following cannot expand its octet?
A)P
B)C
C)Cl
D)Xe
E)S
10
Estimate the enthalpy change for the reaction below given the following bond energies:

C2H6(g) + Cl2(g) ----> C2H5Cl(g) + HCl(g)

BE(C-H) = 414 kJ/mol; BE(C-C) = 347 kJ/mol;

BE(C-Cl) = 327 kJ/mol; BE(H-Cl) = 431 kJ/mol;

BE(Cl-Cl) = 242 kJ/mol.
A)-113 kJ
B)-68 kJ
C)-102 kJ
D)-344 kJ
E)276 kJ
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