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Molecular Geometry: Page 7
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Molecular Geometry:</strong> Unshared Electrons and a Trigonal Pyramid</font>
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<td><img src="atomMainIdea.png" width="98" height="58"></td>
<td>To predict shape, we consider the regions of electron density and the number of atoms attached to the central atom.</font></td>
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<p class="question">
Make a prediction for the shapes of NH<font size="2" face="Verdana, Arial, Helvetica, sans-serif"><sub><b>3</b></sub></font>
and BF<font size="2" face="Verdana, Arial, Helvetica, sans-serif"><sub><b>3</b></sub></font>,
shown at right:
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true
their shapes will be the same
their shapes will be different
not enough information is given
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<p class="firstp">
<b>After getting the correct answer for the question above,
ball and stick models will appear under the Lewis structures. Use the
snapshot button to take an image of the NH<sub><font size="2" face="Verdana, Arial, Helvetica, sans-serif">3</font></sub>
model. Then use the circle tool (<img src="drawCircle.gif">) to draw in
NH<sub><font size="2" face="Verdana, Arial, Helvetica, sans-serif">3</font></sub>'s
unshared electron pair (on the ball and stick model). </b>
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Take a snapshot of NH3
Take a snapshot of NH3
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Place your snapshot of NH<font size="2" face="Verdana, Arial, Helvetica, sans-serif"><sub>3</sub></font>
with the added unshared electron pair here:
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Explain your placement of the unshared electron pair in the snapshot at
left.
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>The shape of NH<sub>3</sub>
is called "trigonal pyramidal". What is its electron geometry?</strong>
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true
linear
trigonal planar
tetrahedral
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<p class="question">
Explain why the shape of BF<font size="2" face="Verdana, Arial, Helvetica, sans-serif"><sub><b>3</b></sub></font>
is the same as its geometry:
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