Question

What is evaporation of Water?
A.It is a process during which neither heat is absorbed nor evolved
B.It is a process accompanied by chemical reaction
C.exothermic process
D.endothermic process

Answer 1

Hint: In the evaporation process, water is first taken then it converts from water to gas or vapor. For all this work, energy is required because energy breaks the molecules of water. In this water molecules are converted to vapor molecules.

Complete step by step answer:
In the process of evaporation, the water changes from liquid to gas or vapor molecules. Liquid molecules transfer energy to each other when they collide with each other. This is based on how they collide with each other. During the process of evaporation, the removed energy of vaporized liquid will decrease temperature of water which will result in evaporative cooling.
Sublimation is the process in which water changes from solid to gas directly skipping the liquid phase.
Heat is also important for the evaporation to occur because heat energy breaks the molecules of water together. This is the reason why water evaporates at the boiling point and evaporates very slowly at the freezing point.
The Exothermic is the process in which heat is released in the environment and entropy in the surrounding increases but in the endothermic process the heat is absorbed from the environment which decreases the entropy of the environment.
This is what happens in the evaporation as it requires heat or energy for the process to occur. Therefore, it is the endothermic process.
So, option (D) is the correct answer.


Note:The molecules of water are held by bonds. To break those bonds evaporation requires energy or heat. The process in which heat is absorbed from surroundings is called endothermic change.