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Molecular Geometry: Page 9
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BUTTER OIL
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Molecular Geometry: Getting Into Shape, part 2</font>
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<td><img src="atomMainIdea.png" width="98" height="58"></td>
<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">At room temperature, you can hold a stick of butter. Why not a "stick of oil"? </font></td>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">At right are
two ways to represent long chain fat molecules like those in butter and
oil. The lower representation has been shortened and simplified. A circle
represents each carbon and the atoms around it. </font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">Imagine you
put some butter and some oil into a freezer a few hours ago. By now they
are frozen solid, which means the molecules of each are very still, and
are packed together as closely as their shapes will allow. The models
below show the frozen fat molecules in butter and oil. Using the models,
you can see what the molecules do as the temperature increases.</font>
<p>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif"><b>1. Click
Run in the control panel below the models.<br>2. Use the Heat and Cool
buttons to change the temperature of both solids at the same time.<br>3.
Take a snapshot of each model when it has melted into a liquid. In the
text box at the bottom of the snapshots you take, identify each snapshot
as butter or oil.<br>4. Answer the questions below. </b></font>
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How can you tell when molecules have melted?
Click here for a hint
In liquids, the molecules move past each other easily.
Hint
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<strong><font size="4" face="Arial, Helvetica, sans-serif">Which of the
two solids melts (becomes a liquid) first?</font></strong>
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butter
oil
they melt at the same temperature
they never melt
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<strong><font size="4" face="Arial, Helvetica, sans-serif">What effect(s)
do kinked fatty acids have on melting solid fat?</font></strong>
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they increase the amount of heat needed to melt the solid
they decrease the amount of heat needed to melt the solid
they make it easier for the solid to melt
they make it harder for the solid to melt
they have no effect on melting
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<strong><font size="4" face="Arial, Helvetica, sans-serif">To get a "stick
of oil" you'd have to put some oil into the refrigerator or freezer.
Explain how molecular shape accounts for this: </font></strong>
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