Nonpolar molecules that cluster away from water molecules are called __________ molecules.

• A. amphipathic
• B. hydrophilic
• C. ionic
• D. hydrophobic

Answer: (D)

Verified step by step guidance

1. Understand the context: The problem is asking for the term used to describe nonpolar molecules that tend to cluster away from water molecules.
2. Recall the nature of water: Water is a polar solvent, so it interacts well with polar or charged molecules but poorly with nonpolar molecules.
3. Identify the key property: Nonpolar molecules that avoid water are said to be 'water-fearing' or repelled by water.
4. Match the options with definitions: 'Amphipathic' molecules have both polar and nonpolar parts, 'hydrophilic' molecules are water-attracting, and 'ionic' molecules carry a charge.
5. Conclude that the correct term for nonpolar molecules that cluster away from water is 'hydrophobic' molecules.