A molecule with one positively charged side and one negatively charged side is best described as what?

• A. Polar Molecule
• B. Nonpolar Molecule
• C. Ion
• D. Isomer

Answer: (A)

Polarity. When atoms pull electrons toward themselves unequally, due to differences in electronegativity, the molecule develops a partial negative charge on one end and a partial positive charge on the other. Describing a molecule as having one side positively charged and one side negatively charged fits this pattern, signaling a dipole and polar character, even if the overall molecule is neutral. This differs from an ion, which carries a full net charge, and from a nonpolar molecule, which lacks distinct charged regions. Isomers are about different structural arrangements of the same formula, not about uneven charge distribution. Understanding polarity helps explain why such molecules interact with water and participate in hydrogen bonding in biological systems.