Chemistry (Chang), 10th Edition

Chapter 9: 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/0023654666/17477/ch9quizaq5a.gif','popWin', 'width=120,height=116,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/0023654666/17477/ch9quizaq5b.gif','popWin', 'width=121,height=119,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/0023654666/17477/ch9quizaq5c.gif','popWin', 'width=135,height=114,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/0023654666/17477/ch9quizaq5d.gif','popWin', 'width=131,height=99,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
Ignoring resonance, 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. Ignoring resonance, 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/0023654666/17477/ch9quizaq8a.gif','popWin', 'width=189,height=188,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/0023654666/17477/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/0023654666/17477/ch9quizaq8c.gif','popWin', 'width=185,height=182,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 below given the following bond energies:

C2H4(g) + H2(g) ----> C2H6(g)

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
11
All elements react according to the octet rule.
A)True
B)False
12
Which statement is false concerning ionic bonds and compounds?
A)Ionic bonds are a result of electrostatic forces.
B)Ionic bonds usually occur between elements with high and low electron affinities.
C)Elements of an ionic compound usually carry the same charge.
D)Lewis dot symbols are useful for tracking electrons.
13
In a Lewis structure of a compound:
A)the shared electrons are represented by either a line or two dots between the atoms.
B)all the electrons are represented for each atom.
C)only lone pairs of electrons are represented.
D)None of the above
14
Identify the correct statement comparing ionic and covalent compounds.
A)Ionic compounds usually have a shorter bond length than covalent compounds.
B)Ionic compounds usually have a higher heat of vaporization than covalent compounds.
C)Covalent compounds usually have better electroconductivity than ionic compounds.
D)Covalent compounds usually have a higher boiling point than ionic compounds.
15
Resonance structures are unique relatively stable structures rather than combinations of different structures.
A)True
B)False
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