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phase changes, temperature constant?

Posted: Sun Feb 02, 2020 10:35 pm
by Alexandra Bartolome 2H
During phase transition, why does the temperature of the sample remains constant even though heat is being supplied?

Re: phase changes, temperature constant?

Posted: Sun Feb 02, 2020 11:10 pm
by 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.

Re: phase changes, temperature constant?

Posted: Mon Feb 03, 2020 4:50 pm
by 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.

Re: phase changes, temperature constant?

Posted: Mon Feb 03, 2020 5:17 pm
by 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.

Re: phase changes, temperature constant?

Posted: Tue Feb 04, 2020 12:52 pm
by 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.

Re: phase changes, temperature constant?

Posted: Tue Feb 04, 2020 10:49 pm
by 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.

Re: phase changes, temperature constant?

Posted: Sat Feb 08, 2020 12:03 am
by 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).

Re: phase changes, temperature constant?

Posted: Sat Feb 08, 2020 9:13 am
by 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

Re: phase changes, temperature constant?

Posted: Sat Feb 08, 2020 10:21 am
by Zoe Gleason 4F
The temperature remains constant because the energy is going towards the phase change itself, and will therefore not heat the system.

Re: phase changes, temperature constant?

Posted: Sat Feb 08, 2020 1:54 pm
by Jessica Kwek 4F
Temperature remains constant during phase change because heat energy is stored as potential energy.

Re: phase changes, temperature constant?

Posted: Sun Feb 09, 2020 4:53 pm
by 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.

Re: phase changes, temperature constant?

Posted: Sun Feb 09, 2020 5:21 pm
by 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.