During boiling, what happens to a liquid?

During boiling, what happens to a liquid?

• A. Liquid to Gas
• B. Gas to Liquid
• C. Solid to Liquid
• D. Gas to Solid

Answer: (A)

During boiling, a liquid changes into a gas. When the liquid is heated to its boiling point, the energy you add goes into breaking the forces between the molecules so they move apart as a vapor. This uses latent heat of vaporization, so the temperature stays essentially constant as the liquid boils. Bubbles of vapor form inside the liquid and rise to the surface. This is different from evaporation, which is a surface process that can happen below the boiling point. Boiling depends on reaching the right pressure, and for water at 1 atm that point is 100°C.

During boiling, a liquid changes into a gas. When the liquid is heated to its boiling point, the energy you add goes into breaking the forces between the molecules so they move apart as a vapor. This uses latent heat of vaporization, so the temperature stays essentially constant as the liquid boils. Bubbles of vapor form inside the liquid and rise to the surface. This is different from evaporation, which is a surface process that can happen below the boiling point. Boiling depends on reaching the right pressure, and for water at 1 atm that point is 100°C.