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CHE 105/110 Introduction to Chemistry - Exercises and Answers

Molecular Shapes

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QUESTION ANSWER

1.

What is the basic premise behind VSEPR?

1.

Electron pairs repel each other.

3.

Identify the electron group geometry and the molecular geometry of each molecule.

  1. H2S
  2. POCl3

3.

  1. electron group geometry: tetrahedral; molecular geometry: bent
  2. electron group geometry: tetrahedral; molecular geometry: tetrahedral

5.

Identify the electron group geometry and the molecular geometry of each molecule.

  1. HCN
  2. CCl4

5.

  1. electron group geometry: linear; molecular geometry: linear
  2. electron group geometry: tetrahedral; molecular geometry: tetrahedral

7.

What is the geometry of each species?

  1. CN
  2. PO43−

7.

  1. linear
  2. tetrahedral

9.

What is the geometry of each species?

  1. COF2
  2. C2Cl2 (both C atoms are central atoms and are bonded to each other)

9.

  1. trigonal planar
  2. linear and linear about each central atom

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