Temperature of sample constant

[Do Yeun Park]

In the lecture, Dr. Lavelle mentioned that the temperature of a sample remains constant even though heat is being supplied. Could someone explain what this means?

[Mikayla 2G]

I believe this occurs during a transition phase, such as boiling. During boiling, the liquid water temperature is 100C. As heat is added, the water begins to vaporize, meaning water molecules are going from liquid to gas, when each molecule makes this transition, they take energy with them, therefore as heat energy is added to the system, it is being removed at the same rate by the vaporized water molecules, so the temperature of the liquid water stays the same.

[Noa Popko 3I]

This happens during a phase transition. The heat that is supplied is going toward breaking down the bonds between molecules (for example to transition something from a liquid to a solid) rather than heating up the system, so there isn't any change in the temperature.

[Andrew Nguyen 1E]

Hi,
Within an experimental context, I think this means that a sample's temperature is initially before the reaction begins and once the reaction reaches equilibrium at which point the temperature of the sample should be the same as it was initially (making it appear constant) while the heat generated by the reaction is released and detected within the sample's surroundings.

[Clarence Clavite 2K]

During the transition phase of the reaction, the energy in the form of heat goes to breaking the bonds instead of raising the temperature. Once the bonds are broken is when the heat begins to raise the temperature.