Use the graph and diagram to answer the question. Which is the best interpretation of the two flat portions of the graph? Responses These show where temperature is 0ºC. These show where temperature is 0ºC. - no response given These show where kinetic energy is increasing. These show where kinetic energy is increasing. - no response given These show where thermal energy does not exist. These show where thermal energy does not exist. - no response given These show where changes of state are occurring. These show where changes of state are occurring. - no response given

Answer 1

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

In temperature versus time graphs, flat portions typically indicate a phase change (such as melting or boiling), during which the temperature remains constant while the substance is transitioning between states (solid to liquid, liquid to gas, etc.). During this time, energy (thermal) is being absorbed or released, but the temperature does not change.