Which of the following properties is not shown by covalent compounds? A. Low boiling points and melting points B.Brittle solids C.Covalent compounds are soluble in water D.Poor conductors of heat and electricity
Hint: Chemical compounds made up of elements bound by covalent bonds are known as covalent compounds or molecular compounds. Since nonmetallic elements have the same or identical electronegativity values, covalent bonds can only form between them.
Complete answer: A covalent bond is formed when the electrons from both participating atoms are shared equally. Shared pair or bonding pair refers to the pair of electrons involved in this form of bonding. Molecular bonds are another name for covalent bonds. The atoms can achieve equilibrium in their outer shell through the sharing of bonding pairs, similar to noble gas atoms. Properties Low melting points and boiling points Since the weak attractions between covalent molecules need only a small amount of energy to resolve, these compounds melt and boil at far lower temperatures than metallic and ionic compounds. At room temperature, many of the substances in this class are liquids or gases. Low enthalpies of fusion and vaporization These properties are normally a factor of one or two lower than those of ionic compounds. Soft or brittle solid forms The weak intermolecular forces make it possible to distort or crack the strong structure of covalent molecular compounds. Poor electrical and thermal conductivity. When molten, ionic compounds and metallic solids both conduct electricity well. Covalent molecular compounds, on the other hand, do not. Covalent compounds are insoluble in water Covalent compounds are nonpolar, and water is a polar solvent. This means that covalent compounds do not dissolve in water and instead form a distinct layer on the water's surface. As a result, we can assume that covalent compounds are water insoluble. Hence, option C is correct.
Note: Covalent compounds are nonpolar, and water is a polar solvent. This means that covalent compounds do not dissolve in water and instead form a distinct layer on the water's surface. As a result, we can assume that covalent compounds are water insoluble.