Distinguishing boiling from evaporation by key characteristics

Steps:

• Identify boiling: internal vaporization where bubbles form throughout the liquid at its boiling point.
• Identify evaporation: surface vaporization that occurs below boiling point, absorbing heat from the liquid.
• Match first descriptor in choices to boiling: requires bubbles forming through the liquid.
• Match second descriptor to evaporation: involves heat absorption, producing a cooling effect.

Why B is correct:

• Boiling features bubbles forming throughout as vapor pressure equals atmospheric pressure; evaporation produces cooling per the latent heat of vaporization, where escaping high-energy molecules lower the liquid's average kinetic energy.

Why the others are wrong:

• A: Second part "only at one temperature" applies to boiling, not evaporation which happens at any temperature.
• C: First part "occurs at any temperature" describes evaporation, not boiling which requires a specific temperature.
• D: First part "occurs at any temperature" describes evaporation, not boiling; ignores bubble formation.

Final answer: B