Use the graph and diagram to answer the question which is the best interpretation of the two flat portions of the graph. Would it be the show where kinetic energy is increasing or they show where changes of state are occurring or they where temperature is zero Celsius or do you show with thermal energy does not exist

Answer 1

The two flat portions of a temperature vs. time graph typically indicate phases during which a substance is undergoing a change of state (e.g., melting or boiling). During these changes, the heat energy added to the substance is used for breaking the intermolecular bonds rather than increasing the temperature. Therefore, the best interpretation of the two flat portions of the graph is that they show where changes of state are occurring.