Be sure that mm is selected and close the dialog box

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Unformatted text preview: Experiment 9: VSEPR General Chemistry I and II Lab Manual Close the periodic table window, and choose the “rotate tool.” Change the display to “balls and cylinders” option and look at the molecule carefully while rotating it. Compare the structure from HyperChem with what you predicted using VSEPR. Draw the structure as best you can. Dakota State University Page 121 of 232 Experiment 9: VSEPR General Chemistry I and II Lab Manual Do this for all structures above. Each time, you’ll have to go to “file” “new” to open a new page (do not save the structures). This tool is designed to help you visualize the molecules you are working with. Feel free to try the various rendering options, but before building a new molecule, change the rendering back to “stick.” For at least a few of the molecules (you can do it for all of them if you like), let HyperChem simulate the motions the molecule can have (this is just ONE of the computational tools available in HyperChem). With the molecule on the screen, click on “setup” and “molecular mechanics.” Dakota State University Page 122 of 232 Experiment 9: VSEPR General Chemistry I and II Lab Manual This will open up a dialog box. Be sure that “MM+” is selected, and close the dialog box by clicking “OK.” Molecular mechanics is a technique chemists use to simulate motion of a molecule. Don’t worry about any of the options. Now, click on “compute” and “molecular dynamics…”. Dakota State University Page 123 of 232 Experiment 9: VSEPR General Chemistry I and II Lab Manual Be sure the options are set as below: Dakota State University Page 124 of 232 Experiment 9: VSEPR General Chemistry I and II Lab Manual Once the settings are in (heat time 0 ps, run time 10 ps, cool time 0 ps, step size 0.001 ps, simulation temperature 300K, in vacuo selected, constant temperature deselected, 1 time steps and 1 data steps), click proceed and watch the screen carefully. Take observations. Dakota State University Page 125 of 232 Experiment 10: Gas Laws General Chemistry I and II Lab Manual Experiment 10: Gas Laws Purpose: To become familiar with the behavior of gases PPpppphhhhh: Yeah, that’s right, I typed it… Background: None Introduction: When one thinks of the gas laws in terms of the medical field, respiration immediately springs to mind. After all, respiration allows us to exchange oxygen for use in the cells with carbon dioxide, the bi-product from the cells, and since we are not aquatic animals, our respiration takes place in a gaseous medium. Since respiration takes place in a gaseous medium, it is subject to gas laws. Two of the most significant laws governing respiration are Boyle’s Law and Poiseuille’s Law, but let’s not forget Charle’s law, without which temperature calculations would be impossible. Let’s begin with a review of volume. Volume we all know. A one dimensional structure such as a line has length, a two dimensional structure such as our shadows have area and as three dimensional creat...
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