Temperature and Phase Changes

[Sierra Nimnual 2G]

When a substance undergoes a phase change, why does the temperature not change during the phase change?

[Jocelyn Ni 3C]

The temperature will remain the same until a phase change is finished. It remains constant during the phase change because the heat energy produced is used up in changing the state of matter and breaking or forming bonds. In other words, the average energy of the substance remain the same during phase change and will only change when the change is done, which then leads to temperature change.

[Niyati 1F]

The temperature will remain constant during a phase change because that energy is being used to facilitate the change either by forming or breaking bonds.

[305568482]

This is because during change in a state the heat energy is used to change the bond between the molecules. These exchanges in energy are not changes in kinetic energy, they are instead changes in bonding energy between the molecules. That is why temperature is not affected.

[Bridgette Ryning 1D]

The temperature does not change during a phase change because all of the energy going into the substance is being used to break the bonds of the molecules and therefore will not be converted to heat which would change the temperature.

[Sarah Wang 2G]

When a substance is in solid form, its intermolecular forces are strong, and the molecules that make up that substance are stuck very close to each other, In order to overcome that force and become a liquid, a similar concept to breaking a bond occurs, and the heat that goes into the system is used to pull the molecules apart instead of heating them up. The same thing occurs when transitioning from liquid to gas, since energy from heat is also absorbed by the system and used to overcome the intermolecular forces that keep the substance in liquid form. As a result, all the energy/heat is used up overcoming the intermolecular forces instead of raising the temperature. Water has a high specific heat capacity (amount of energy needed to raise its temperature by 1 degree Celsius) because its molecules are held together by hydrogen bonding, which are one of the strongest intermolecular forces. As a result, it takes a lot of energy or heat to overcome the hydrogen bonds and boil water (liquid to gas), which is great for the sea creatures.

[405672459]

The temperature will remain constant throughout, all the energy being used is breaking the bond and thereby creating no temperature channge.

[Miles Dailey 1K]

The temperature of a substance doesn't change during a phase change because all of the energy that enters is being used to break the intermolecular bonds, rather than the energy going towards heating the substance up.

[Valerie M Dis 2E]

When a substance undergoes a phase change, the temperature doesn't change because that energy is used towards breaking or forming bonds.

[Isabelle Kim 3E]

Temperature stays the same during phase changes since the energy is mainly used to break the bonds. This does not mean that temperature does not matter at all. Once the substance has completely converted into a different phase (s,l,g), temperature will either rise/fall until it reaches another phase change where the temperature will be the same during that particular phase change. And so on...

[Lauren Eng 1G]

The temperature does not change while in a phase change because the energy that is being used is put into breaking/forming the bonds, rather than raising/lowering the temperature of the reactant in question.

[Kimberly_Wu_3H]

The temperature remains the same because all the energy being used is to break or form bonds, meaning that it will not nbe converted to heat.

[805810326]

During phase changes the temperature is held constant because energy is being used during this period to break bonds and take a compound, for example an ice cube to it's next phase which would be a liquid.

[905722616]

The temperature stays the same (constant) during the phase change because that energy is needed to create the change of phase by either breaking, or forming bonds. The temperature at that point is what allows the phase change to begin.

[AliciaRoice_1K]

This is because the energy that is used to change the temperature is being used to actually facilitate the phase change.