Potassium reacts violently with water, yet the WHO recommends a potassium intake of at least 3.5 g per day for adults. Why doesn’t potassium react violently when eaten, even though the human body is about 70% water? Describe the difference in terms of atomic structure and energy. 2. What makes Lewis structures successful in this regard, and where does its predictive power end? 3. CH4 and CH3Cl are both tetrahedral molecules, but their polarities are different. Explain the reason for this difference. Draw the Lewis structures of both molecules, indicate the numerical electronegativity difference for every bond, and indicate whether each bond is polar or nonpolar.
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. Potassium reacts violently with water, yet the WHO recommends a potassium intake of at least 3.5 g per day for adults. Why doesn’t potassium react violently when eaten, even though the human body is about 70% water? Describe the difference in terms of atomic structure and energy.
2. What makes Lewis structures successful in this regard, and where does its predictive power end?
3. CH4 and CH3Cl are both tetrahedral molecules, but their polarities are different. Explain the reason for this difference. Draw the Lewis structures of both molecules, indicate the numerical electronegativity difference for every bond, and indicate whether each bond is polar or nonpolar.
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