JAMB - Chemistry (1998 - No. 8)
A solid begins to melt when?
constituent particles acquires a greater kinetic energy
energy of vibration of particles of the solid is less than the intermolecular forces
constituent particles acquires energy above the average kinetic energy
energy of vibration of particles of the solid equals the intermolecular forces
Explication
When a solid is heated, the particles are given more energy and start to vibrate faster.
At a certain temperature, the particles vibrate so much that their ordered structure breaks down.
At this point the solid melts into liquid.