chem102-lecture 2b-quizkey - Cl-Si-Cl if you fill all 3...

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Chem 102 pop quiz 1-12-2011 key (this is a 3 point bonus quiz) Consider the molecule SiCl 2 . (Si = silicon, group 4; Cl = chlorine, group 7). Si is the central atom. a) Draw the Lewis structure, indicate polarity of bonds and of the molecule [1 pt] b) name the electron domain geometry [.5] c) name the molecular geometry [.5] d) what is the Cl-Si-Cl bond angle? [.5] e) what type of hybridization does Si have? [.5] Solve it yourself then look at the solution in the next page…
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Solution: a) Lewis structure: # valence e’s = 2(7)+4 =18 e’s
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Unformatted text preview: Cl-Si-Cl if you fill all 3 atoms with full octets, you end up with 20 e’s. So, discard 2 e’s and form another bond between Si and Cl: Cl-Si = Cl Si-Cl bonds are both polar; molecule is polar since the 2 polar bonds don’t cancel out. b) trigonal planar since there are 3 electron domains around Si c) angular or bent d) 120° (or, better still: < 120 ° - i.e. slightly less than 120° ) e) since the electron domain geometry is trigonal planar, the hybridization of Si must be sp 2 ....
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