13. In one sentence, clearly explain why CO has a small bond dipole (polar compound) and the oxygen has a partial positive charge. You can draw a picture to support your answer. 14. In one sentence, clearly explain why MgO has a much higher lattice energy than NaF. a) Draw a valid Lewis structure below (connectivity N-N-O). Assign formal charges to all atoms. b) Draw two additional resonance structures of the structure you drew in part (a). Assign formal charges to all atoms. c) Circle the single structure above (from the three structures in parts (a) and (b)) that most closely represents the true structure of N20 and briefly explain your choice. Draw three possible resonance structures for OCS. Indicate and briefly explain which structure is the most important.
Formal Charges
Formal charges have an important role in organic chemistry since this concept helps us to know whether an atom in a molecule is neutral/bears a positive or negative charge. Even if some molecules are neutral, the atoms within that molecule need not be neutral atoms.
Polarity Of Water
In simple chemical terms, polarity refers to the separation of charges in a chemical species leading into formation of two polar ends which are positively charged end and negatively charged end. Polarity in any molecule occurs due to the differences in the electronegativities of the bonded atoms. Water, as we all know has two hydrogen atoms bonded to an oxygen atom. As oxygen is more electronegative than hydrogen thus, there exists polarity in the bonds which is why water is known as a polar solvent.
Valence Bond Theory Vbt
Valence bond theory (VBT) in simple terms explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. It gives a quantum mechanical approach to the formation of covalent bonds with the help of wavefunctions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
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