Question

what change in states of matter is occurring at point b on the graph if thermal energy is increasing?
melting
freezing
evaporation
condensation

Explanation:

When thermal energy is increasing and there is a flat - portion on a temperature - thermal energy graph, it indicates a phase change. Point B is at a higher temperature than point A. Melting occurs at a lower temperature phase change. Freezing and condensation are processes that release energy. Evaporation is the process of changing from a liquid to a gas as thermal energy is added, which is consistent with an increasing thermal - energy situation at a constant temperature during the phase change.

Answer:

C. evaporation