Answer Key Bonding Unit Page 2
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2
3
421. The melting and boiling points are higher when the attractive forces holding particles
together are stronger. Generally:
a. Which attractive force is the weakest and which type of substance would have this
attractive force?
Intermolecular forces
b. Which attractive force is the strongest and which type of substance would have this
attractive force?
The covalent bond in a 3-dimensional network.
c.
How do you tell if a bond is polar covalent or nonpolar covalent or ionic?
Look at the
difference in the electronegativities of the elements involved. If the difference is greater
than 1.7 the bond is ionic, if the difference is between 0.3 and 1.7 the bond is polar
covalent, between 0 and 0.3 the bond is essentially nonpolar.
d.
How do you tell is a molecule is polar or not?
Molecules are polar if they have an
asymmetrical shape and contain polar bonds.
e. Which type of substances might have polar molecules?
Small covalent molecules
22. Draw a Lewis Structure for each substance listed below.
a. H
b. O
c. SO
d. CaCl
2
2
2
2
H – H
–
e. C(diamond)
f. C(graphite)
g. NO
h. BF
3
3
i. SF
j. KCl
k. Mg
l. Zn
6
m. H
O
n. NH
o. NaCl
2
3
23.
List the ionic substances in question 22 in order of decreasing melting point..
+2
+
CaCl
, NaCl,
KCl.
The Ca
ion in CaCl
has a higher charge than the Na
ion in NaCl, the
2
2
+
+
K
ion in KCl is larger in size than the Na
ion in NaCl
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