Additional Exercises

  1. P2 is not a stable form of phosphorus, but if it were, what would be its likely Lewis electron dot diagram?
  2. Se2 is not a stable form of selenium, but if it were, what would be its likely Lewis electron dot diagram?
  3. What are the Lewis electron dot diagrams for CO and CN–?
  4. What are the Lewis electron dot diagrams of CH2O and CO32-?
  5. What geometry is around the Si in SiH4? Is this molecule polar or not polar? If polar draw dipole moment.,
  6. What geometry is around the N in NH3? Is this molecule polar or not polar? If polar draw dipole moment.,
  7. Which bond do you expect to be more polar: an O–H bond or an N–H bond?
  8. Which bond do you expect to be more polar: an O–F bond or an S–O bond?
  9. Ethylene (C2H4) has two central atoms. Determine the geometry around each central atom and the shape of the overall molecule.
  10. Hydrogen peroxide (H2O2) has two central atoms. Determine the geometry around each central atom and the shape of the overall molecule.
  11. Determine the molecular dipole moments for the following molecules:

    dipole_moment_questions

Answers

1.  It would be like N2:

\chemfig{\Lewis{4:,P}~\Lewis{0:,P}}

3.

Two pairs of Lewis structures are shown. The left pair of structures show a C atom and an O atom with six dots in between them and a lone pair on each. The word “or” and the same structure with a triple bond in between the C atom and O atom also are shown. The name “Carbon monoxide” is written below this structure. The right pair of structures show a C atom and an N atom with six dots in between them and a lone pair on each. The word “or” and the same structure with a triple bond in between the C atom and N atom also are shown. The name “Cyanide ion” is written below this structure.

Image from: Openstax CHemsitry-2e

5. Tetrahedral, not polar

7. An O–H bond

9. Trigonal planar about both central C atoms

11.

dipole_moment_solutions

 

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