Which term describes molecules that mix readily with fats?

• A. Lipophilic
• B. Hydrophilic
• C. Aqueous
• D. Soluble

Answer: (A)

Lipophilic describes molecules that are fat-loving and mix readily with fats and oils because fats are nonpolar. When a substance shares similar nonpolar characteristics with a lipid environment, the intermolecular forces align in a way that allows it to dissolve or disperse well in fats. This idea is often summed up as "like dissolves like"—nonpolar substances dissolve best in other nonpolar solvents.

If a substance is hydrophilic, it is water-loving and tends to mix with water rather than with fats, due to polarity. Aqueous relates to water-based solutions and doesn’t specify affinity for fats. Soluble is a broad term meaning something can dissolve in a solvent, but it doesn’t specify the solvent type; lipophilicity specifically describes the fat affinity.