Question

label the phase change diagram
drag labels to their correct position on the image
evaporate
liquid
solid
gas
condense
melting
freezing

Explanation:

On a phase - change diagram, at low heat energy and low temperature, the substance is in solid state (label 'Solid' at the start, e.g., near point A). As heat energy is added and temperature rises slightly, melting occurs (label 'Melting' at the first horizontal section). After melting, the substance is in liquid state (label 'Liquid' in the region after melting). As more heat is added, evaporation occurs (label 'Evaporate' at the second horizontal section). After evaporation, the substance is in gas state (label 'Gas' in the high - heat and high - temperature region). Condensing is the reverse of evaporation (not shown in the increasing heat direction here but would be when heat is removed), and freezing is the reverse of melting.

Answer:

Near the start (low heat and low temp): Solid
First horizontal section: Melting
Region after melting: Liquid
Second horizontal section: Evaporate
High - heat and high - temp region: Gas