Dakota state university page 115 of 232 experiment 9

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Unformatted text preview: st 3 isome rs) Formula 11: C4 H10 (2 isomers) Formula 12: See how many formulas you can get from C5 H12 Dakota State University Page 113 of 232 Experiment 9: VSEPR General Chemistry I and II Lab Manual Computer visualization of molecules: IMPORTANT NOTES : (1) HyperChem is available ONLY on the computers in the computer lab in the science center. It is not available anywhere else. (2) We have only FIVE licenses for HyperChem; thus, if you log on and get an error message regarding the licenses, try again later. This implies that you must NOT wait too long before starting this assignment. (3) Be sure that the first part of the lab is completed BEFORE attempting to do this portion of the lab. The idea is to compare your results from the computer with your results from above. Log on to a computer in the science center computer lab, and start HyperChem Pro. Dakota State University Page 114 of 232 Experiment 9: VSEPR General Chemistry I and II Lab Manual You will need to know a few key features of the hyperchem menu: (For a color copy of this experiment, see WebCT.) Before we begin building a molecule, go to the “display” and “rendering” option. Dakota State University Page 115 of 232 Experiment 9: VSEPR General Chemistry I and II Lab Manual This will open up a dialog box; be sure “stick” is activated (as opposed to the other options). This will make it easier to build the molecule. Now, to build a molecule, double click the build tool, and it will bring up a periodic chart. Dakota State University Page 116 of 232 Experiment 9: VSEPR General Chemistry I and II Lab Manual To build something like, say, formula 2, begin by clicking on C to be sure it is activated. Notice that the periodic chart is the “active window”; you will have to click once in the black space to make HyperChem the “active window”; the second time you click in the black area, a carbon should appear as a relatively small blue item (kind of a circle, but not really; you’ll see what I mean). Dakota State University Page 117 of 232 Experiment 9: VSEPR General Chemistry I and II Lab Manual Now, we will want to attach an oxygen to this carbon. Click on oxygen in the periodic box. Place the cursor on the carbon in the black area, and draw a line up. If no line appears, the periodic box was still the “active window;” just try it again until you get a line that is blue on one side (the carbon) and red on the other. Dakota State University Page 118 of 232 Experiment 9: VSEPR General Chemistry I and II Lab Manual This represents a SINGLE BOND between carbon and oxygen. To make it a double bond, click on the bond until you see two parallel lines. Dakota State University Page 119 of 232 Experiment 9: VSEPR General Chemistry I and II Lab Manual To undo a bond, right click on the bond instead (we need not do that now; we have what we want). Now, everything has been added except for hydrogen. Go to “build” and “add H and model build” and Hyperchem will complete the structure for you, complete with the correct bond lengths and angles. Dakota State University Page 120 of 232...
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