phase changes, temperature constant?

[Alexandra Bartolome 2H]

During phase transition, why does the temperature of the sample remains constant even though heat is being supplied?

[lilymayek_1E]

heat remains constant during a phase change because heat is being supplied to the phase change mechanism itself, not to the actual heating of the subject being heated. heat is being used in creating the phase change at the same rate that it's being applied to the actual material, so the heat remains constant.

[Sam McNeill 1E]

The temperature remains the same because all of the energy from the heat is being used to transition the substance into the next phase.

[Qiu Ya Wu 4I]

In addition, you can think of the temperature remaining the same due to all the added heat being used to break the bonds between molecules of a substance.

[CosetteBackus_4F]

Heat is necessary for the phase change to occur so the heat being supplied is being used to break the bonds and does not contribute to the heat of the substance itself.

[Joanne Lee 1J]

The temperature of the sample remains constant even though heat is being supplied because all the energy is being used to change the substance phase, not alter the temperature of the sample.

[Shutong Hou_1F]

The change of a substance from a phase of a lower energy to a phase of a higher energy requires heat to break intermolecular interactions between molecules, thereby making the substance have higher potential energy between molecules (usually, the volume of a substance: solid state < liquid state < gas state).

[Radha Patel 4I]

The heat of the bonds to break the substance are being supplied while the temperature does not change to allow the phase change to occur

[Zoe Gleason 4F]

The temperature remains constant because the energy is going towards the phase change itself, and will therefore not heat the system.

[Jessica Kwek 4F]

Temperature remains constant during phase change because heat energy is stored as potential energy.

[Sydney Pell 2E]

When heating a substance, for example, water, the heat energy is used to first raise the temperature to the boiling point. When the temperature gets to that point, the heat energy is then used to complete the phase change instead of raising the temperature further. So, the boiling water would stay at 100 C while using the heat energy to convert its molecules to the gas phase instead.

[Manav Govil 1B]

An increase in heat energy is not the same thing as an increase in temperature (delta H is different than T). Therefore it is possible for heat energy to be introduced to the system and for the temperature to not increase.