Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving
any solid.
Answer:
- Sublimation: Naphthalene has a property called sublimation, which means it changes directly from a solid to a gas without becoming a liquid.
- When exposed to air, naphthalene gradually evaporates into the surroundings.
- Since it converts into gas, no solid residue is left behind.
- Other substances that exhibit sublimation include camphor, dry ice (solid CO₂), and iodine.