PLEASE HELP!!!!!
According to the heating curve, when a substance is melting, what is happening to the temperature as energy is continually being added it?
A. The temperature is increasing as more energy is being added to melt the substance.
B. The temperature stays the same as energy continues to be added to melt the substance.
C. The temperature is decreasing as more energy is being added to melt the substance.
D. The flat curve indicates a change in the temperature allowing for a change in phase.
