silva (jrs4378) – Homework 2: Bonding – Shear – (52375)
1
This
print-out
should
have
24
questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
Use the Pauling electronegativity values
from Figure 13.3 of your text book to solve
any problems needing EN. In the exam a sim-
ilar table will be provided.
Remember that
topics covered by ALEKS are not included in
Quest homework topics that you particularly
need to be able to do are how to draw Lewis
structures, how to use VSEPR theory to pre-
dict the shape and polarity of molecules, how
to use VB theory to predict hybridization,
and how to use MO theory to predict bond
length and strength. Extra examples of these
to work in addition to ALEKS will be sup-
plied via quest (for no credit) as we cover
them in class..
001
10.0 points
Which, if any, pair of name and formula (in-
cluding charge) is INCORRECT?
1.
sulfate ion : SO
2
-
4
2.
phosphate ion : PO
3
-
4
3.
None is correct
4.
carbonate ion : CO
2
-
3
5.
All are correct
correct
6.
nitrate ion : NO
-
3
Explanation:
002
10.0 points
How many grams of NH
3
can be produced
from the reaction of 17.8 moles of H
2
and a
sufficient supply of N
2
?
N
2
+ 3 H
2
→
2 NH
3
1.
100.grams
2.
455 grams
3.
408 grams
4.
202 grams
correct
5.
11.9 grams
6.
225 grams
Explanation:
? g NH
3
= 17
.
8 moles H
2
×
parenleftbigg
2 moles NH
3
3 moles H
2
parenrightbigg
×
17
.
034 g NH
3
1 mole NH
3
= 202
.
137 grams
003
10.0 points
When dealing with electrons in atoms and
molecules, the electrons that are not consid-
ered as valence electrons (can, cannot) ef-
fectively shield the nucleus and thereby (de-
crease, increase) the effective nuclear charge.
1.
cannot; increase
2.
cannot; decrease
3.
can; increase
4.
The non-valence electrons do nothing.
5.
can; decrease
correct
Explanation:
004
10.0 points
Electron affinity corresponds to the energy
released or absorbed in which process (for
atom A)?
1.
A +
e
-
→
A
-
correct
2.
A
→
A
+
+
e
-
3.
A
→
A
+
+ 2
e
-
4.
None of these
5.
A 50 electron volt electron collides with
A to give A
+
+ 2
e
-
.
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silva (jrs4378) – Homework 2: Bonding – Shear – (52375)
2
Explanation:
Electron affinity is defined as the amount
of energy absorbed in the process in which an
electron is added to a neutral isolated gaseous
atom to form a gaseous ion with a
-
1 charge.
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- Spring '09
- RUTH
- Chemical bond
-
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