Have high enthalpies if vaporization. Compounds are classified as ionic or molecular (covalent) on the basis of the bonds present in them. You can recognize ionic compounds because they consist of a metal bonded to a nonmetal. Compounds are of two kinds: Ionic and Molecular. Have high boiling points. Are usually hard and brittle solids. Lewis structures for covalent bonding use lines to represent the sharing of electrons. Have high enthalpies of fusion. Ionic Compounds vs Molecular Compounds. Ionic Compounds When an element composed of atoms that readily lose electrons (a metal) reacts with an element composed of atoms that readily gain electrons (a nonmetal), a transfer of electrons usually occurs, producing ions. Plan your 60-minute lesson in Science or Chemistry with helpful tips from Keith Wright For example, HCl dissociates into H + and Cl-in water, making an environment of free-flowing electrons. Each of these two types of compounds has its own naming system and Lewis dot structure. Tend to be soluble in water. The most obvious similarity is that the result is the same: Both ionic and covalent bonding lead to the creation of stable molecules. Have low boiling points. Ionic solids (such as HCl and NaCl) dissolved in water conduct electricty due to the dissociation of the ionic components. Ionic bonds form between two atoms that have different electronegativity values.Because the ability to attract electrons is so different between the atoms, it's like one atom donates its electron to the other atom in the chemical bond. Covalent Compounds: Have low melting points. Ionic Compounds Have high melting points. Recognizing Compounds With Ionic Bonds . The differences between bonds are clearly important because ionic and covalent compounds work so differently, but there are a surprising number of similarities. Conduct electricity in liquid form and in aqueous solution. Almost all the compounds in Chemistry can be broadly categorized under ionic and molecular compounds. Lewis structures for ionic bonding do not use lines because electrons are either lost or gained, not shared, so the dots (aka electrons) are moved from one element to the other to represent bonds, and brackets are used to show which element the electrons "belong" to. In Chemistry, you have definitely heard the word ‘compounds.’ But have you actually wondered what it is? They differ from each other due to the bonding type between the atoms that take part in making a molecule/ compound. When two or more elements come together and combined, the compound gets formed. Ionic compounds are made of a metal and a nonmetal, while molecular compounds combine nonmetals. Main Difference – Ionic vs Molecular Compounds.