Chemistry Homework Sheet
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1
2
3Chemistry Homework Chapter 7
Class:
Number:
Name:
Which Lewis Dot Formula below is incorrect?
____
1.
a.
b.
c.
d.
e.
____ 2. Which Lewis Dot Formula below is incorrect?
a.
b.
c.
d.
e.
____ 3. How many unpaired electrons are shown in a Lewis Dot Formula for silicon?
a. 0
b.1
c.2
d.3
e. 4
____ 4. An atom of which element below has the most unpaired electrons?
a. Ba
b.Al
c.P
d.F
e.O
____ 5. Which choice below represents the general reaction of the 1A metals with the 7A elements?
a. 2 M(s) + X
2 MX(s)
b. M(s) + X
MX(s)
c. M
(s) + X
2 MX(s)
2
2
2
d. M(s) + X
MX
(s)
e. none of these
2
2
____ 6. Magnesium and nitrogen react to form Mg N
an ionic compound. The magnesium ion, Mg , has
____ electrons in its highest occupied energy level.
a. 8
b.2
c.10
d.4
e.5
____ 7. What is the charge on the simple (single atom) ion that sulfur forms?
+
+
+
-
-
a. 1
b. 2
c. 3
d. 1
e. 2
____ 8. What is the formula for the binary ionic compound of aluminum and sulfur?
a. AlS
b. Al S
c. AlS
d. Al S
e. Al S
____ 9. Which one of the formulas below is incorrect?
a. MgCl
b. Na I
c. InF
d. K S
e. SrO
____ 10. The ionic solid NaCl is more stable than a mixture of Na and Cl atoms. This is best
explained by:
a. The large, negative crystal lattice energy compensates for the energy lost
+
-
when forming Na
and Cl
.
b. Both the electron affinity for Cl and the ionization energy for Na are negative
values.
c. The negative value for the electron affinity for Cl is larger than the ionization
energy required for Na.
d. The negative value for the ionization energy required for Na is larger than the
electron affinity for Cl.
e. None of these is the correct explanation.
____ 11. The number of unshared pairs of electrons in the outer shell of sulfur in H S is ____.
a. One
b. two
c. three
d. four
e. zero
____ 12. The total number of covalent bonds in the N
molecule is ____.
a. One
b. two
c. three
d. four
e. zero
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