Reflection: Rigor Valence Shell Electron Pair Repulsion Theory (VSEPR) - Section 5: Elaborate Part II

 

During this activity there were quite a few students who were confused on several parts so I have made changes on the lab document which I will implement next year.  Here is a copy of the document with the changes.

  1. For some of the molecules the kit does not have the balls that work well.  For example for NH4+ the blue ball only has 3 holes (great for NH3) so does not work.  Therefore students need to know to use the black ball instead.  Similarly for some of the yellow balls there are only 3 holes and some have 6 so I need to make sure they have some options to also use the black ball.  I added onto the front these two options.
  2. Many students were confused with the exceptions to the octet where I simply had how many electrons could be around the central atom so I also added in a little bit more detail.  For example for PCl5 instead of just saying that P can hold 10 electrons I added that all 5 Cl's will bond to the one P.

 

  Rigor: Trouble with some molecules and exceptions to the octet
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Valence Shell Electron Pair Repulsion Theory (VSEPR)

Unit 3: Unit 3: Bonding & Periodic Table Trends
Lesson 8 of 9

Objective: Students will be able to determine the shape of molecules using VSEPR theory as evidenced by taking notes, performing a molecule lab, and doing whiteboards.

Big Idea: Valence Shell Electron Pair Repulsion Theory (VSEPR) allows chemists to infer the shape of molecules.

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Subject(s):
Science, Chemistry, VSEPR, Valence Shell Electron Pair Repulsion Theory
  120 minutes
vsepr
 
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