phase transition

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Monica Soliman 3F
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phase transition

Postby Monica Soliman 3F » Wed Jan 20, 2021 3:50 pm

I m kind of confused about how temp is still constant even heat is being supplied or released?

VSU_3F
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Re: phase transition

Postby VSU_3F » Wed Jan 20, 2021 3:54 pm

Temperature is still constant because the heat that is being absorbed by the system is solely breaking the bonds of the system. That's why during phase changes, temperature remains constant.

Karl Yost 1L
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Re: phase transition

Postby Karl Yost 1L » Wed Jan 20, 2021 3:57 pm

For solid --> liquid: the added heat is supplying the particles with enough energy to allow them to slide past each other and move around (characteristic of liquids), instead of being fixed in position

For liquid --> gas: the added heat is overcoming the intermolecular forces between the molecules/atoms, allowing the atoms/molecules to move around freely (characteristic of gases).

Jessica Katz
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Re: phase transition

Postby Jessica Katz » Wed Jan 20, 2021 5:25 pm

there is no temperature change until the phase change occurs because until the actual phase change is taking place, the heat needed in the system is breaking the bonds in order to have that phase change from something like solid to liquid. Then, once the change happens, the temperature will increase.

Madeline Louie 1B
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Re: phase transition

Postby Madeline Louie 1B » Thu Jan 21, 2021 1:30 am

Temperature can remain constant, despite the addition or removal of heat because heat applied to a system is used to create or break bonds. When creating or breaking bonds the heat does not heat up the system but is redirected to the changing the bonds and changing the phases. Once the bonds have been created or broken and the phase change has been completed, the heat can change the temperature again.

Karina Grover 1A
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Re: phase transition

Postby Karina Grover 1A » Thu Jan 21, 2021 10:01 am

Temperature can remain constant because the heat being absorbed isn't going towards heating up the system/surroundings. Rather, the heat is going solely towards breaking the bonds within the system so that a phase change can occur. Bonds must be broken to transform a solid into a liquid and a liquid into a gas. I hope this helps!

Lucy_Balish_3G
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Re: phase transition

Postby Lucy_Balish_3G » Thu Jan 21, 2021 10:06 am

When a substance is heated, the heat has to go somewhere. So for phase changes, the heat goes into breaking the bond. We might think at first that heating raises its temperature, but that is actually not true because all the heat is going into breaking the bonds.

Samantha Lee 1A
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Re: phase transition

Postby Samantha Lee 1A » Thu Jan 21, 2021 12:49 pm

The temperature remains constant during the transition between two states of matter, as the additional energy being added isn't resulting in an increased temperature because the heat is going into breaking the bonds and changing the structure of the state of matter. This is found in the formula Q=ML, where the L stands for latent heat, the heat used to convert one state of matter into another without the change in temperature. We will probably learn more about this in our calorimetry unit.

Chloe Shamtob 2H
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Re: phase transition

Postby Chloe Shamtob 2H » Thu Jan 21, 2021 1:36 pm

Temperature is constant even when heat is being supplied or released during a phase change because the heat that is being added to the substance is being absorbed to break the bonds of that substance and change its phase. Therefore, because the heat is being used up to break the bonds the additional heat is not taken into account and the temperature remains constant.

Sheryl Ocampo 1D
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Re: phase transition

Postby Sheryl Ocampo 1D » Thu Jan 21, 2021 2:21 pm

Temperature is constant during a phase change as the heat is being used to break/form bonds

Dominic Benna 2E
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Re: phase transition

Postby Dominic Benna 2E » Thu Jan 21, 2021 10:08 pm

The reason why it's temperature doesn't increase is because the energy that is being given to the system is being used break bonds for the phase change to happen.

Victoria Dao 3G
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Re: phase transition

Postby Victoria Dao 3G » Thu Jan 21, 2021 11:21 pm

Very similar to what everyone else said above, but during phase changes, the heat is going towards breaking the hydrogen bonds, so the heat is therefore absorbed (endothermic). Once the bonds have been broken, the water will continue to heat up until the point where enough energy/ temperature is achieved to break more hydrogen bonds. I hope this helps!

Anthony_Sandoval_1D
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Re: phase transition

Postby Anthony_Sandoval_1D » Thu Jan 21, 2021 11:45 pm

The temperature stays constant because the heat goes towards breaking the hydrogen bonds instead of going towards temperature.

Samudrala_Vaishnavi 3A
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Re: phase transition

Postby Samudrala_Vaishnavi 3A » Fri Jan 22, 2021 7:50 am

The temperature is still constant since all of the heat goes into breaking the bonds of the material rather than physically heating up the material. That is why there is a constant line, which is basically the material transforming into another phase.


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