Question

The amide group shown below plays an important role in the structure of proteins: Draw another resonance structure for this group, and show all found formal charges. 2(6). Draw four reasonable resonance structures for the PO_3tF^2- ion. The other atoms are each bonded to the central atom. 3(3). Compare the bond energy of F_2(g) with the energy change for the foollowing process: F_2(g)rightarrowF'(g)+F'(g) Energetically speaking, which is the preferred dissociation process F_2?

Answer 1

Explanation of 1 and 2 question: Resonance is is a mental exercise and method within the Valence Bond Theory of bonding that describes the delocalization of electrons within molecules. It compares and contrasts two or more possible Lewis structures that can represent a particular molecule. Resonance structures are used when one Lewis structure for a single molecule cannot fully describe the bonding that takes place between neighboring atoms relative to the empirical data for the actual bond lengths between those atoms. The net sum of valid resonance structures is defined as a resonance hybrid, which represents the overall delocalization of electrons within the molecule. A molecule that has several resonance structures is more stable than one with fewer. Some resonance structures are more favorable than others.

2,5) :O H Another Structure 0 Global Structure

2,6) :0 e (2) Se (4) 0 Global structure

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