Separation of Substances Notes

• When matter changes from its gaseous state into its liquid state, it is called condensation.
• Condensation is the reverse process of evaporation, and it brings about change in the physical state.

• In nature, water vapour in the air condenses to change into its liquid state—the dew.
• Condensation takes place only when water vapour hits a cold surface.

• When we add some salt to water and stir it, the salt disappears.
• This is because the salt has dissolved in water.
• Dissolving is a change where substances mix completely with the liquid they have been added to and cannot be separated easily.
• All substances do not dissolve in water.

Solute: