What happens to temperature during phase change?

[Matthew Do 2G]

I'm confused about what happens to the temperature of a reactant, lets say water, during its phase change from a liquid to a gas. Does the temperature increase as more energy is applied to it during the phase change? How would this work when you would go to calculate the total bond enthalpy of a reaction when there is a phase change within it?

[James Pham 1A]

During phase changes, the temperature does not change as the energy applied to the reaction is fully put toward causing the phase change. To calculate the total enthalpy, you can add the enthalpy of the bonds to the enthalpy of the phase change (which is usually given).

[paulina_higashi_1G]

Based on what I heard during lecture, because heat is required during a phase change, the temperature of the sample remains constant even though heat is being supplied.

[Angela Ke]

A good way to visualize the the changes in temperature/energy is by looking at a phase change graph. The phase changes occur where the graph is a horizontal line, which demonstrates that there is no temperature change, even though the heat energy is increasing. So this shows that there's no temp change during a phase change.

[Richard Chiu 1I]

The temperature remains stagnant during the phase change, as the energy is used to affect the bonds instead of fueling the kinetic movement of molecules (which temperature basically measures).

[Jasmine Patel 1B]

Based on my understanding, the temperature would increase as heat is supplied generally, though when there is a plateau in the graph heat supply will not have an influence until it is high enough to induce a phase change.

[Octavio Santana 2H]

During a phase change, there would be no change in temperature. A very helpful graph in lecture shows how temperature remains constant (horizontal line) during the phase change process. It is important to note that heat does not equal temperature, so although heat is applied, the temperature is fixed for that period of time (phase change).

[Natalya Cummings 2E]

During the actual phase change, there is no change in temperature.

[Simran_Gill_3L]

During a phase change, the temperature does not change because the energy put into the system is used completely during the phase transitions. To go through a phase transition like liquid to vapor, the bonds have to be broken. Heat is going to break the bonds for the phase change to occur, causing the temperature to stay constant.

[Jon Trujillo 3L]

During a phase change, the temperature remains constant as all incoming energy is redirected into changing the state of the object. For example, as water is being changed from a liquid to a gas, the liquid will remain at 100 degrees Celsius while it is being converted into a gas, then the gas particles may be heated past that 100 degree mark.

[sherwin arian 1K]

Hi! During the phase change the temperature doesn't change. This is because the heat is being used for transitioning the change of phase (for example breaking bonds) so the temperature would stay the same.

[Tony Wu 2D]

I believe that the temperature would remain constant during phase change since the energy is used for breaking the molecules in phase change.

[Kimberly_Wu_3H]

There will be no change in temperature since the heat will be used during the change of phase.

[405750027]

The temperature does not change during a phase change because the heat is used during the process of phase changing so the temperature will stay the same.

[Megan Ho 2B]

During phase changes, the temperature of a substance remains constant because the energy is not used to increase the kinetic energy of the molecules (aka the temperature) but is used to break the bonds for the phase change to occur.

[Adelyne_Tran_1J]

During a phase change, the temperature does not increase because it is being used to break the bonds in order to induce the phase change. Since it's focused on breaking intermolecular bonds of the molecule, the overall net heat is not increasing. To calculate the bond enthalpy, you add the enthalpies of the individual bonds(given). For each bond in the molecule, you must account for it being broken.

[parisnortega1]

The temperature of a substance remains constant while a phase change occurs. Endothermic processes go from low energy to high energy: solid to liquid to gas.