Evaporation and cooling

Question 1

Evaporation

Answer 1

when a liquid changes into a gas.

• fast moving molecules with high kinetic energy can leave the liquid, leaving molecules with lower kinetic energy behind.
• the surface bonds are weaker in volatile liquids and they evaporate quickly.

Question 2

Cooling

Answer 2

occurs as when the higher energy particles escape the surface of the liquid, it leaves behind lower energy particles, making the average kinetic energy of the liquid to drop and therefore the temperature.