use the particle theory of matter to explain how a solid can melf if sufficiently heated

Answer 1

According to the particle theory of matter, all matter is made up of tiny particles that are constantly moving. In a solid, these particles are closely packed together and have very little energy. When heat is added to a solid, the particles begin to vibrate more rapidly, and this causes them to gain kinetic energy.

As the kinetic energy of the particles increases, they begin to overcome the attractive forces that hold them in a fixed position. The particles begin to move further apart and the solid starts to expand. Eventually, if the solid is heated enough, the particles will have enough kinetic energy to break free from their positions and move around freely. At this point, the solid has melted and become a liquid.

In summary, the addition of heat to a solid causes the particles to gain kinetic energy, they begin to move more rapidly, break the attractive forces holding them in place and start to move apart expanding the solid. If they acquire enough energy to break completely free, the solid melts and becomes a liquid.