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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![**Educational Website Content: Lewis Dot Structure Exercise**
**Exercise Description:**
Please show the completed Lewis Dot structure for the molecule depicted. Add all necessary (missing) formal charges and lone pairs.
**Structure Given:**
A molecular structure is shown with a central nitrogen atom bonded to one methyl group, one oxygen atom (double-bonded), and an amine group. There is also a hydrogen attached to the oxygen.
**Options for Completing the Lewis Structure:**
- **Option A:**
- The nitrogen is bonded to a CH₃ group, an amine group (NH₂), and doubly bonded to an oxygen atom.
- The oxygen is shown with a positive charge, a single lone pair, and bonded to a hydrogen.
- The nitrogen does not have a lone pair, shown with a positive charge. The oxygen carries a positive charge.
- **Option B:**
- The nitrogen is similar to Option A, but it retains a lone pair.
- The oxygen is single-bonded to hydrogen and has a single lone pair.
- The nitrogen carries a positive charge, and the oxygen does not carry any charge.
- **Option C:**
- The nitrogen has a lone pair and a positive charge.
- The oxygen is double-bonded to nitrogen and has two lone pairs. It carries a negative charge.
- The oxygen-hydrogen bond is shown.
- **Option D:**
- Similar to Option C, with a lone pair on nitrogen and no charge.
- The oxygen is shown with two lone pairs, bonded to hydrogen, and carries no charge.
**Explanation:**
Each option modifies the placement of lone pairs and formal charges. The correct Lewis structure will ensure that all atoms satisfy the octet rule where applicable, and that the overall formal charge on the molecule is minimized. Evaluate each option carefully to determine the correct representation.
**Graphical Representation:**
The diagrams depict various Lewis structures with different bonding and formal charge arrangements, facilitating understanding of molecular geometry and electronic configuration.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F82dd1d29-7049-45b8-a9a7-805a4d4d6374%2F75d2cb04-435c-4412-82ec-60e03a259db1%2Ftwktxnk_processed.jpeg&w=3840&q=75)
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