Question

Which of the following is true about boiling but not about evaporation?

A. The smaller the liquid surface area, the slower the process
B. The cooler the liquid, the slower the process
C. Boiling always happens at a particular temperature
D. Gas forms on the liquid's surface

Answer 1

Boiling occurs at the boiling point of the liquid, which is a specific temperature where bubbling throughout the liquid indicates a phase change, whereas evaporation can happen at any temperature below the boiling point and only at the liquid's surface.

Step-by-step explanation:

The true statement about boiling that is not true for evaporation is: C. Boiling always happens at a particular temperature. This particular temperature is known as the boiling point and is specific for each liquid. During boiling, the entire liquid gets enough thermal energy to convert into gas, and you can see bubbles of vapor forming throughout the liquid, not just on the surface. In contrast, evaporation can occur at any temperature below the boiling point and typically happens at the surface where molecules with sufficient kinetic energy escape into the gas phase.