Question

Do all molecules of liquid take part in evaporation? If not ,explain your answer

Answer 1

No only the molecules at the upper surface involve in evaporation as heat needed for evaporation not reached the lower surface of liquid.

Answer 2

Let's say I spill liquid on some fabric or on a impermeable material like a countertop. Eventually, the liquid stops being a liquid and we say it has "dried", but what happened to the molecules? Did they change phase? How were the conditions for phase change met? Assume we are at room temperature and the liquid is something that doesn't naturally boil or freeze at that temperature or pressure (like water).

EDIT: I'm aware this is called evaporation, but what happens to the molecular structure during this process? What causes molecules to leave the liquid?