Evaporation vs. Boiling Processes

Steps:

• Evaluate statement 1: Both evaporation and boiling convert liquid to gas, increasing molecular separation in the vapor phase.
• Evaluate statement 2: Boiling occurs at a fixed temperature (boiling point), but evaporation happens at any temperature below it.
• Evaluate statement 3: Both processes require heat input to overcome intermolecular forces and enable phase change.
• Evaluate statement 4: Evaporation occurs only at the liquid surface, while boiling bubbles form throughout the liquid.

Why C is correct:

• Statements 1 and 3 align with the kinetic molecular theory, where phase changes to gas increase separation and absorb latent heat.

Why the others are wrong:

• A includes 4, but evaporation is surface-only, unlike boiling throughout (definition of evaporation).
• B includes 2 and 4, but 2 ignores evaporation's variable temperature, and 4 misstates evaporation's location.

Final answer: C