Resonance Structures Ac

1. I can draw a Lewis structure, including resonance structures when necessary, for a given molecule Learning Targets

2. So far, we’ve learned how to draw a Lewis structure to represent the covalent bonding that occurs in a molecule. Sometimes there is more than one possible Lewis structure for a molecule. All of the possible Lewis structures for a molecule are called “resonance” structures. Resonance Structures

3. Resonance structures are drawn using the same rules for Lewis structures. Resonance is possible when multiple bonds are necessary to create an octet on the central atom. If there is a choice when choosing a pair of electrons to move into a multiple bond, then there are resonance structures. Resonance structures are possible ONLY if there is a choice when creating multiple bonds. Resonance Structures

4. A double headed arrow ( ) is used in between the structures to indicate that they are in resonance with one another.

5. Ozone, O 3 Practice Problems Draw all possible resonance structures for the following molecules.

6. Ozone, O 3 Practice Problems Draw all possible resonance structures for the following molecules. O O O . . . . . . . . . . . . . .

7. Ozone, O 3 Practice Problems Draw all possible resonance structures for the following molecules. O O O . . . . . . . . . . . . . . Central atom octet not satisfied!

8. Ozone, O 3 Practice Problems Draw all possible resonance structures for the following molecules. O O O . . . . . . . . . . . . . . One pair needs to be shared. ?

9. Ozone, O 3 Practice Problems Draw all possible resonance structures for the following molecules. O O O . . . . . . . . . . . . . . If you have a choice, resonance structures exist! ?

10. Ozone, O 3 Practice Problems Draw all possible resonance structures for the following molecules. Ozone has two resonance structures. The completed structures have all octets satisfied. O O O . . . . . . . . . . . . O O O . . . . . . . . . . . .

11. Carbon Dioxide Practice Problems Draw all possible resonance structures for the following molecules.

12. Carbon Dioxide Practice Problems Draw all possible resonance structures for the following molecules. C O O . . . . . . . . . . . . Central atom octet not satisfied!

13. Carbon Dioxide Practice Problems Draw all possible resonance structures for the following molecules. C O O . . . . . . . . . . . . Two pairs need to be shared with carbon. ?

14. Carbon Dioxide Practice Problems Draw all possible resonance structures for the following molecules. C O O . . . . . . . . . . . . You have a choice. Therefore, resonance structures exist. ?

15. Carbon Dioxide Practice Problems Draw all possible resonance structures for the following molecules. C O O . . . . . . . . C O O . . . . . . . . C O O . . . . . . . . Carbon dioxide has three resonance structures. The completed structures have all octets satisfied.