- \(\text{HClO}_2\) is molecular because it is composed entirely of nonmetals.
- \(\text{PCl}_5\) is molecular because it is composed entirely of nonmetals.
- \(\text{FeI}_3\) is ionic because it is composed of a metal and a nonmetal.
- Final classification: \(\text{HClO}_2\): molecular, \(\text{PCl}_5\): molecular, \(\text{FeI}_3\): ionic.
Explanation
- Analyzing the Principles of Chemical Bonding
Chemical classification relies on the nature of the elements involved in the bonding process. Ionic compounds typically form between a metal (which loses electrons to form a cation) and a nonmetal (which gains electrons to form an anion), resulting in an electrostatic attraction. Molecular or covalent compounds typically form between two or more nonmetals, where atoms share electrons to achieve stable electron configurations. We will examine each compound based on this fundamental distinction.
- Classifying the Given Compounds
- \(\text{HClO}_2\): This compound consists of Hydrogen (H), Chlorine (Cl), and Oxygen (O). All three are nonmetals. Since it is formed by a combination of nonmetals, it is classified as a molecular compound.
- \(\text{PCl}_5\): This compound consists of Phosphorus (P) and Chlorine (Cl). Both elements are nonmetals. Consequently, the bonding involves electron sharing, making it a molecular compound.
- \(\text{FeI}_3\): This compound is composed of Iron (Fe), which is a transition metal, and Iodine (I), which is a halogen (a nonmetal). Because it contains both a metal and a nonmetal, it is classified as an ionic compound.
Examples
Classifying substances as ionic or molecular is essential in everyday science. For example, table salt (NaCl) is an ionic compound that dissolves in water to conduct electricity, while water (\(\text{H}_2\text{O}\)) is a molecular compound that does not conduct electricity when pure. Knowing whether a substance is ionic or molecular helps scientists predict physical properties such as melting point, solubility, and conductivity, which is crucial for applications ranging from creating safe chemical products to understanding biological processes in our bodies.