What will happen if you keep increasing the temperature (adding heat) of a liquid?

• A. The liquid will remain unchanged regardless of the amount of heat added.
• B. The liquid will eventually undergo a phase change and become a gas.
• C. The liquid will decompose into its constituent elements.
• D. The liquid will freeze and become a solid.

Answer: (B)

Verified step by step guidance

1. Understand that when heat is added to a liquid, its temperature increases, causing the molecules to move faster and gain kinetic energy.
2. Recognize that as the temperature rises, the liquid approaches its boiling point, the temperature at which the vapor pressure equals the external pressure.
3. At the boiling point, the liquid undergoes a phase change from liquid to gas (vaporization), where added heat is used to break intermolecular forces rather than increase temperature.
4. Note that during this phase change, the temperature remains constant until the entire liquid has vaporized.
5. Conclude that continuously adding heat to a liquid will eventually cause it to change phase and become a gas, rather than remaining unchanged, freezing, or decomposing.