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.
1. For each molecule and ion below, indicate the total number of valence electrons. Based on that number of electrons, draw a valid Lewis structure.
2. Use VSEPR theory to determine the electron arrangement and the geometry of the molecule around the central atom(s). A table of geometries is attached.
3. Build the molecule using the molecular models provided in the lab. Sketch your model well enough to show the geometry. Include bond angles.
4. Using your understanding of electronegativity and its trends in the Periodic Table, determine if polar bonds exist in the molecule.
5. Using bond polarity and molecular shape, determine if the molecule has an overall dipole. If all the bonds are nonpolar, the molecule is nonpolar. If polar bonds are present, then consider the shape to determine if the molecule has an overall dipole.
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