Question

Which statement best explains why the temperature of boiling water remains constant at 100°C until all the water has changed to steam (at 1 atm)?

पर्याय

• No heat energy is supplied to the water during boiling

• The heat energy supplied is used to increase the density of water

• The heat energy supplied is used to overcome intermolecular forces and form steam

• The heat energy supplied is lost completely to the surroundings

Answer 1

The heat energy supplied is used to overcome intermolecular forces and form steam

Explanation:

At the boiling point, added heat goes into breaking intermolecular bonds and separating molecules into vapour, so temperature does not rise during this phase change.