Chapter 7 - Chemistry Ch 7 Chemical Bonding attractive...

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Chemistry: Ch. 7 Chemical Bonding: attractive forces that hold atoms together in compounds Bonds are composed of electrons o Ionic- metallic cation and nonmetallic anion o Covalent- to or more nonmetals At least two primary types of chemical bonds: ionic and covalent Ionic bonds result from electrostatic attraction between a cation (metal) and an anion (nonmetal) Covalent bonds result from sharing of one or more pairs of electrons between two atoms Melting points o Ionic compounds are usually solids with high melting points Typically > 400 C o Covalent compounds are gases, liquids, or solids with low melting points Typically > 300 C Solubility in polar and nonpolar solvents o Ionic compounds Generally soluble in polar solvents Insoluble in nonpolar solvents o Covalent compounds Generally insoluble in polar solvents Generally soluble in nonpolar solvents Conductivity in molten solids and liquids (aqueous solutions) o Ionic compounds
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