Use the graph and diagram to answer the question. Which is the best interpretation of the two flat portions of the graph? (1 point) Responses These show where temperature is 0ºC. These show where temperature is 0ºC. These show where thermal energy does not exist. These show where thermal energy does not exist. These show where changes of state are occurring. These show where changes of state are occurring. These show where kinetic energy is increasing

Answer 1

The best interpretation of the two flat portions of the graph is: These show where changes of state are occurring.

In a temperature vs. thermal energy graph, flat portions typically indicate phases where temperature remains constant despite the addition of heat energy, which corresponds to changes of state (such as melting or boiling) where thermal energy is used to break molecular bonds rather than increasing temperature.