not necessary, it's related to melting point of liquid and the room temperature.
dosa, egg yolk,
the particles heat up
Freezing
It freezes.
Heat is added to a solid to make a liquid... this is called melting. some additional liquid (water,ethanol,acid…) also change solid into a liquid.
When a substance changes from a liquid to a solid it releases energy. (You take the heat out)
The heat energy required to change a substance between solid & liquid at constant temperature is called the "latent heat of fusion". If the change is from solid to liquid the substance gains this energy. If the change is from liquid to solid the substance gives up this energy. The exact amount of latent heat of fusion is different for different substances.
In that case, the liquid may eventually change to a gas.
None - heat is evolved, not required.
Heat is added to a solid to make a liquid... this is called melting. some additional liquid (water,ethanol,acid…) also change solid into a liquid.
heat
It doesn't. Evaporation is the change of state from a liquid to a gas, caused by added surface heat. You're thinking of freezing, caused by loss of heat.
Chemicals chAnge their state or form when energy is added ie heaT OR COLD CHANGE TO SOLID LIQUID OR GAS
heat
Adding or removing energy in the form of heat causes the phase change. The amount of heat to be added or removed is called latent heat. It changes the state of a substance without changing it's temperature. There are two types of latent heat. The latent heat of fusion, and the latent heat of vaporization. The latent heat of fusion must be added to change phase from solid to liquid, and removed to change from liquid to solid. The first change is endothermic and the second change is exothermic. The latent heat of vaporization must be added to change phase from liquid to vapor, and removed to change from vapor to liquid. Again the first change is endothermic and the second change is exothermic.
That's the heat of fusion.
Thermal (heat) energy must be added or removed in order to cause a change of state.
It depends on the phase change. When going from solid to liquid (melting), liquid to gas (boiling), or solid to gas (sublimation) heat is absorbed. When going from gas to liquid (condensation), liquid to solid (freezing), and gas to solid (deposition) heat is released.
No, freezing changes a liquid to a solid. To change a solid to a liquid you need to apply heat. The change begins when the solid reaches its melting point.
To change a liquid into solid at constant temperature, an amount of heat is released equal to the latent heat of that liquid. For water it is about 80 calories per gram.
When you heat a liquid and it changes phase it becomes a solid.