Question

What must be added to water in order to change state from liquid to a gas? A) more liquid B) energy or heat C) more oxygen atoms D) more hydrogen atoms

Answer 1

energy or heat is required as it vapourises the water to gas

Answer 2

Energy or heat must be added to water in order to change state from liquid to a gas. (Option B)

• In the liquid form of the water,the water molecules are connected with each other by the fairly strong hydrogen bonds.

• To change the water state from liquid to gas,we have to break the hydrogen bonds which are present in liquid water.

• These bonds can be broken by the application of energy, especially the heat energy.

• After heat application and breaking process of the hydrogen bonds,the liquid water becomes gaseous water vapour.