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Unformatted text preview: second carbon to our first, so begin by clicking on the carbon
already there, and drag a line a little ways to represent the bond. You will find that the circle
disappears, and all that remains is the line. This is OK; the default rendering (that is, how the
program displays molecules) is a short-hand “stick” form. This line represents the single line
between the two carbons, with a carbon on each end. If the line does not draw the first time, try
it again (again, if the Hyper Chem window is not the active display, the first time you click on it
all it does is activate the window). Dakota State University Page 26 of 232 Using HyperChem General Chemistry I and II Lab Manual Now, we need to add another carbon to our chain of two, so, simply click on one end of
the line, and draw another line. Here’s a hint, though; make the line at a slight angle, so you can
easily see each atom. By doing this, there is a carbon at each end, and one carbon at each bend
(in this case, only one bend). Dakota State University Page 27 of 232 Using HyperChem General Chemistry I and II Lab Manual Now, isopropanal (which is present in trace amounts in isopropyl alcohol) has a double bonded
oxygen to the central carbon (here, the one in the bend). So, select oxygen in the periodic chart
(O), click the bend in our line (the central carbon), and draw a line up for the oxygen. Notice
again that we will only get a line, but THIS time, the line is blue on one side (where the carbon
is) and red on the other (to represent oxygen on the other side). Dakota State University Page 28 of 232 Using HyperChem General Chemistry I and II Lab Manual If you accidentally clicked on the middle carbon twice, you will notice that it changed from blue
to red. Hyper Chem assumed you wanted to change the identity of that atom (which you did
not). No problem, just choose Carbon in the periodic chart and double click the red bend to turn
it back to blue; then click on Oxygen, click and drag the line from the middle carbon to put the
oxygen on just as before.
Now, we have a problem. We don’t want a single bond between the carbon and the
oxygen, but rather, a double bond. Well, this really is not a problem; with oxygen still selected
in the periodic chart, just click once in the middle of the line between the carbon and the oxygen.
You will see it change from a single line to two lines, to represent a double bond. Dakota State University Page 29 of 232 Using HyperChem General Chemistry I and II Lab Manual Now, isopropanal actually has six hydrogens, but we are not going to add them manually. Hyper
Chem actually has a very nice feature to do this automatically. Close the periodic chart, and
under “Build” choose “Add H & Model Build”. This feature automatically completes your
molecule by adding hydrogen to any “open valences” (that is, location where it is expecting
another bond but there is not one) and selecting the best bond lengths and angles for all of the
atoms in the molecule. Dakota State University Page 30 of 232 Using HyperChem General Chemist...
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