Heat Melting or Boiling

[Jack Van Ryan 1A]

Why does the temperature of a sample remain constant even though heat is being supplied during a phase transition?

Thank you!

[Ben Zhang 2H]

The temperature remains constant during the phase change because the energy being added isn't being used to increase the kinetic energy of the particles. Instead, the energy is being used to break the bonds between the molecules and make them move more freely.

[Crystal Ros 2L]

The absorption or release of heat is being used to create or break bonds, respectively. Therefore, the loss or addition of heat is not being used to raise the temperature of the sample. In order to do so, the heat must either break or form bonds and continue further after this initial phase change is finished.

[Zechuan Rao 1K]

Because the heat supplied is used to change the structure of a substance. Or, you can think of the heat absorption process of phase change lowers the surrounding environment so that the temperature remains the same. Or, you may think of a substance at a certain pressure that can not maintain its phase after the temperature passes a point, thus if heat is supplied, it will all contribute to the phase change or make the next phase hotter.

[KyLee 1H]

During phase change, the energy being supplied is used to break / construct the bonds instead of impacting the overall temperature of the molecules.

[Aaron Kim 1J]

During a phase change, the energy is used in breaking and constructing bonds; there's no change in the particles' kinetic energies and thus no change in temperature.

[Nandini_Parmar_1I]

Think of it as a threshold that needs to be overcome in order to reach a different state. It is an intermediate.

[505734174]

During a phase change, the energy that is being supplied is being used to break bonds and therefore, cannot be used to increase the kinetic energy of the molecules so the temperature remains constant.

[Arshaun Faraji 2H]

the temp remains constant during the phase change because the new energy is being used to break down the bonds instead of to heat up the substance.

[Kainath Kamil Dis 2K]

Temperature remains constant in a phase change because the energy is used to break bonds instead of being transferred to the particles as kinetic energy, making them heat up.

[Alex Luong 3H]

That energy is used to break the bonds between the molecules so the material could change phases. Once all those bonds are broken, the temperature will rise. A graph with temperature vs heat helped me understand this.

[Alan Nguyen 2I]

The energy is not put into heating the substance; in order to change the state of matter the energy is diverted to breaking the intermolecular forces. This is what breaks up the molecules to make the phase change. When we look at phase change graphs, we see straight lines in between the phases of matter.