NCEES Fundamentals of Engineering (FE) Chemical Practice Exam 2025 - Free Practice Questions and Study Guide

A molecular compound is characterized by the presence of nonmetals and often includes hydrogen in its composition. These compounds are formed when nonmetal atoms share electrons through covalent bonds, leading to the formation of distinct molecules. For example, water (H₂O) and carbon dioxide (CO₂) are molecular compounds, both composed mostly of nonmetals.

In contrast, molecular compounds typically have lower melting and boiling points than ionic compounds, where the latter usually consist of metal and nonmetal elements forming ionic bonds due to the transfer of electrons. This highlights the unique properties of molecular compounds compared to materials formed through ionic bonding.