Question

One cup of water is left outside for two days when it was checked there was only half a cup left. What happened

options:
a)evaporation : chemical change
b)evaporation : physical change
c)condensation : physical change
d)condensation: chemical change​

Answer 1

When a cup of water is kept outside for outside then, b)evaporation: physical change.

• Evaporation is a physical change in which the water molecules are converted into vapours.
• It is a surface phenomenon which means, only water molecules from the surface gets evaporated.
• The water molecules on the surface of the container when kept out tend to get heat and vibrate quickly that they escape in the air or atmosphere.