1/30/14 Molecular Geometry

Mrs. Friedmann started off class by telling us what our homework is for tonight. We have 2 web assigns due at 11:59, another VSEPR handout to do, and we should check moodle for the key to the worksheets we did yesterday. Plus, we have another quiz tomorrow which will be on all the stuff we've been learning about molecular geometry.

In class, Mrs. Friedmann had us finish the VSEPR chart that we started yesterday. This is similar to what we ended up with:




 We are supposed to have this memorized for tomorrow, and Mrs. Friedmann suggested 2 ways. We can either memorize the VSEPR code (ABE) and memorize all the corresponding shapes. . .
OR we can try to visualize what shape the molecule should be just by using our knowledge of the number of clouds and how that number will impact the formation of the molecule. Mrs. Friedmann suggested the latter.

After we finished up the chart, Mrs. Friedmann introduced something called Wedge and Dash Drawings to us, which is a technique for drawing 3-D molecules more clearly. The way it works is that you either use a normal line like this ___ to represent 2-D bonds, a wedge to represent the bonds that stick out towards you, and a dashed line like this - - - to represent the bonds that stick away from you. It's difficult to explain with words, so here's an example:
  It's just an optional, easier way to draw 3-D shapes.

And that's all, so. . . good luck on the quiz everybody!


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