lab7 - Lab #7 Questions To Be Answered: 1. The tetrahedral...

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Lab #7 Questions To Be Answered: 1. The tetrahedral shape is one of the most fundamental shapes in chemical compounds. How would you describe it in words to someone ho has never seen it? Basically it is one atom surrounded by four others, that are placed at 109.5 degree angles from each other. Two extend to the sides ant hen one goes straight up. 2. The octet rule seems to be a very important rule governing the structures of molecules. In light of your work with models, provide a simple explanation for the importance of eight electrons. The octet rule makes sure each side of the atom is fully charged or “happy”. Eight is the number of electrons in the outer most shell, hence the term “octet rule”. 3. Explain in your own words why nonbonded electron pairs help determine the shapes of molecules. Bonds determine the shape of molecules. When electrons are nonbonded they form differently, so anyone only counting electrons as a whole without taking into consideration the bonds would have an inaccurate estimate of the shape. For example, H20 is bent. 4. Do all the assigned molecules obey the octet rule? If not, why (or in what way) did the octet rule fail? No, because the hydrogen atoms were never full or there was an odd number of electrons. 5. Predict shapes of NF3, H2S, Cl2O: 6. Cite one or more examples of models encountered outside of chemistry. Can you think of models that are used in your own fields of study or that you will use in your future career? So many times in political science we encounter models and how to apply them and see how they are shaped and work. One example is campaigns. We analyze people at a molecular level, looking at precincts and see which issues will affect which group and how to get their vote.
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Lab #9 Questions To Be Answered: 1. If class results have been assembled, what was the average of the mole ratios for the whole class? What was the range of experimental values (from lowest to highest)? Do you think any results should be excluded from calculating an average ratio for the whole class? If so, explain why and then calculate a revised average ratio. The average ratio in the class was .98. The lowest was .97 and the highest was 1.0. No, I don’t believe any should be excluded. None were that far off. 2.
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This note was uploaded on 04/13/2008 for the course CHEM 1301 taught by Professor Babilli during the Fall '07 term at SMU.

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lab7 - Lab #7 Questions To Be Answered: 1. The tetrahedral...

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