The particles of a solid are linked together in a network. If the temperature of the solid increases, the particles gain energy. If they gain enough energy, the particles can break free of the network. Then, they are able to move around more freely.
In the event described above, what kind of change is taking place?
A.
a physical change
B.
neither a physical nor a chemical change
C.
a chemical change
D.
both a physical and a chemical change