The energy must be supplied to the solid so that it melts.
During the phase change of a solid to a liquid (melting), all of the energy goes into breaking the intermolecular bonds holding the molecules of the solid together, and none of the energy goes into changing the temperature. Thus, during this particular phase of melting, the temperature of the system does NOT change.
The molecules of the substance gain thermal energy as a result of which they vibrate more energetically. When the molecules have acquired enough energy they escape from the solid and enter the gaseous phase. Incidentally, there is no requirement for there to be a liquid phase between the solid and gas.
When energy is added the particles inside the substance vibrate more. Conversely, the vibrate less when energy is removed.
it will increase or decrease depending on the states. from solid --> liquid or liquid --> gas it is positive and endothermic, and thermal energy is increasing from liquid --> solid or gas --> liquid it is negative and exothermic, and thermal energy is decreasing
The solid state.
when solid has already melted and when heat is supplied it starts increasing the temperature of liquid
it melts
During the phase change of a solid to a liquid (melting), all of the energy goes into breaking the intermolecular bonds holding the molecules of the solid together, and none of the energy goes into changing the temperature. Thus, during this particular phase of melting, the temperature of the system does NOT change.
What happens to a solid when energy is removed
Its molecules starts vibrating more than when they were solid. Their kinetic energy are greater.
This is because of latent heat. When a substance is being melted, heat is supplied to the solid until its melting point is reached. When the solid reaches that temperature, any additional heat energy is used - not to raise its temperature - but to cause the phase to change from solid to liquid. The amount of energy required (per unit mass) is the latent heat of melting (or freezing, when the process is reversed) for that substance. When the phase change is complete, any further heat energy supplied will, once again, go towards raising the temperature.The same thing happens at the boiling point except that this time it is the latent heat of evaporation/condensation.
The molecules of the substance gain thermal energy as a result of which they vibrate more energetically. When the molecules have acquired enough energy they escape from the solid and enter the gaseous phase. Incidentally, there is no requirement for there to be a liquid phase between the solid and gas.
solid
When energy is added the particles inside the substance vibrate more. Conversely, the vibrate less when energy is removed.
The solid changes into a liquid
it will increase or decrease depending on the states. from solid --> liquid or liquid --> gas it is positive and endothermic, and thermal energy is increasing from liquid --> solid or gas --> liquid it is negative and exothermic, and thermal energy is decreasing
Substances changing between soild and liquid undergo Phase Transition and solids absorb energy at constasnt tempertature to phase change solids to liquid. The reverse happens when the liquid turns to solid, energy is given off.