Question

considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change? temperature vs. time temperature (°c) time (min) → the temperature is always lower the temperature is always the same. the temperature is usually lower the temperature is usually higher.

Explanation:

During a change - of - state (like melting or boiling), the temperature remains constant as the heat energy is used for the phase transition rather than increasing the temperature. This is shown by the horizontal sections (e.g., section 4) on the temperature - vs - time graph. So the temperature at the beginning and end of a change of state is the same.

Answer:

The temperature is always the same.