Chemistry Practice Problems Bond Angles Practice Problems Solution: Consider the Lewis structure for glycine, the simp...

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Solution: Consider the Lewis structure for glycine, the simplest amino acid: What are the approximate bond angles at the nitrogen?

Problem

Consider the Lewis structure for glycine, the simplest amino acid:

 An N with one pair of dots is single bonded left and below to H and right to C.  That C is single bonded above and below to H and right to C.  That C is double bonded above to O (which has two pairs of dots) and right to O (which also has two pairs of dots). That O is single bonded right to H.

What are the approximate bond angles at the nitrogen?

Solution

We’re being asked to identify the bond angles around nitrogen in glycineSince the Lewis structure for glycine is already given, we simply need to do the following steps:


Step 1: Determine the number of electron groups around the indicated atom.

Step 2: Determine the electron geometry and bond angle using this:


Electron Regions          Electronic Geometry          Bond Angles

2                                      linear                                    180˚

3                                      trigonal planar                      120˚

4                                      tetrahedral                            109.5˚

5                                      trigonal bipyramidal              90˚, 120˚, and 180˚

6                                      octahedral                            90˚ and 180˚


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