Liquid propane will _____ when heat is added to it.

Liquid propane will _____ when heat is added to it.

• A. Condense
• B. Freeze
• C. Expand
• D. Evaporate

Answer: (C)

When heat is added to a liquid, its molecules gain kinetic energy and move more vigorously, causing them to spread apart slightly. This makes the liquid expand, increasing its volume. For propane, this expansion happens as the temperature rises, and if heating continues enough to reach the boiling point, it will begin to evaporate and turn into gas. Condensing or freezing are cooling processes, so they don’t occur when you’re adding heat. Evaporation can occur later, but the immediate effect of adding heat on a liquid is expansion.

When heat is added to a liquid, its molecules gain kinetic energy and move more vigorously, causing them to spread apart slightly. This makes the liquid expand, increasing its volume. For propane, this expansion happens as the temperature rises, and if heating continues enough to reach the boiling point, it will begin to evaporate and turn into gas. Condensing or freezing are cooling processes, so they don’t occur when you’re adding heat. Evaporation can occur later, but the immediate effect of adding heat on a liquid is expansion.