How Does Deposition Affect State Change and Heat Release?

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Discussion Overview

The discussion revolves around the concept of deposition and its effects on state change and heat release. Participants explore the graphical representation of this process, specifically focusing on temperature versus time plots and heat added versus temperature diagrams.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about the appearance of a state change graph for deposition, suggesting it might be a slope from the gaseous state to the liquid state, but expresses uncertainty.
  • Another participant clarifies that they are discussing a heat added versus temperature plot.
  • A different participant references a heat added versus temperature diagram related to sublimation, indicating a preference for one of two options presented in their workbook.
  • There is a question about whether temperature continually rises during phase changes, with a specific mention of water boiling at temperatures around 90 to 110°C, which contrasts with the common teaching that water boils at 100°C.

Areas of Agreement / Disagreement

The discussion includes multiple competing views regarding the graphical representation of deposition and the behavior of temperature during phase changes, indicating that no consensus has been reached.

Contextual Notes

Participants express uncertainty about the calculations of heat released during deposition and the specific temperature ranges for boiling water, highlighting potential limitations in their understanding of phase change concepts.

Who May Find This Useful

Students studying phase changes, educators looking for examples of heat transfer in state changes, and individuals interested in thermodynamics may find this discussion relevant.

Speedking96
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Homework Statement



How would the state change graph of some matter undergoing deposition look like?

2. The attempt at a solution

I would assume that since it is undergoing deposition, it would just be a slope from the gaseous state to the liquid state. However I am not sure of this? How would one then calculate the heat released during this process, is it at all possible?
 
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You mean temperature vs time plot?
 
Yes. Precisely a heat added vs. temp plot.
 
Ok. So this is an example of a heat added vs. temp diagram of a sublimation phase change from my workbook.

They ask to choose the one on the left(a) or right (b).

I think it is (b) because during the phase change, the temp would continually rise, no?
 

Attachments

  • Sublimation.png
    Sublimation.png
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Google for thermogravimetric curves/analysis.
 
Speedking96 said:
because during the phase change, the temp would continually rise, no?

So you mean water boils between - say - 90 and 110°C? I was always taught water boils at 100.
 

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