constant temperature

[Nancy Stephany Marquez 3C]

i’m am a bit confused on where the energy goes to why the temperature doesn’t change when heat is applied during phase change?

[Ken Kwok 2J]

The energy is used to break the bonds during phase changes so there is no change in the temperature.

[Sophia Balotescu 2B]

Hi Nancy,
During a phase change it takes a while for every single molecule of a substance to melt/freeze/boil/etc. The constant temperature of a phase change basically just means that the substance won't continue changing temperature until all of the molecules have undergone the phase change.

For example - Even if you are melting ice cubes, the temperature of the water that has already melted won't continue to increase until the rest of the ice is melted.

[Nala Son 3B]

Hi!

When heat is applied during phase change, the reason why heat is not released as energy and therefore not changing the temperature is because the energy is first being used to heat or cool the molecules to desired phase. Thus, the temperature will not change until all the bonds between the molecules have broken up completely to become a different phase. Because the temperature does not change during this process, we call it constant temperature.

[Cara_Holden_3A]

The energy goes into breaking bonds between atoms/molecules to lead to more freedom for molecules to move. This takes a while to occur and lots of heat energy.

[Dakshesh Rana 3L]

Heat is required to break bonds, they are endothermic reactions. thats why they take up all the heat.

[Kevin Briceno 3L]

Heat is required to break bonds between atoms because of this it takes more heat at a longer time to boil water than to melt ice.

[GPena1F]

i’m am a bit confused on where the energy goes to why the temperature doesn’t change when heat is applied during phase change?

There is no increase in the particle kinetic energies, and thus no increase in temperature, because the energy required for phase shifts is used to break bonds.