1. are the units that comprise a molecular compound. Are these units charged? YES or NO 2. Positively and negatively charged_ are the units that comprise an ionic compound. What holds these units together in a crystal of an ionic compound? 3. Ionic compounds have very different properties from molecular compounds. Predict whether the following compounds are molecular or ionic. - - KOH (potassium hydroxide)-it is a solid that must be heated to a very high temperature before it will melt, and it conducts electricity when dissolved in pure water. - CO2 (carbon dioxide)-it is a gas at room temperature. -Methanol-it is a liquid at room temperature, and it does not conduct electricity. -Caffeine- it is a solid that dissolves in acetone.
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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