Heating and cooling curves of naphthalene

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Discussion Overview

The discussion revolves around the heating and cooling curves of naphthalene, focusing on the shapes of these curves and how they compare to other substances like stearic acid. Participants express confusion regarding the correct representations of these curves as well as their underlying principles.

Discussion Character

  • Debate/contested, Conceptual clarification, Experimental/applied

Main Points Raised

  • One participant questions the correct heating and cooling curves for naphthalene, noting discrepancies in the graphs found online.
  • Another participant suggests that curve C is the correct cooling curve and curve B is the correct heating curve, but expresses uncertainty.
  • A third participant agrees with the second participant's answers but mentions that someone else suggested curves A and D are correct based on the initial shape of the curves.
  • One participant references Wikipedia as a source for their answers regarding the cooling curve.
  • Another participant expresses a desire to understand the kinetic theory related to the shape of the graph, indicating a need for further explanation.
  • A later reply reiterates that curve C is the correct cooling curve.

Areas of Agreement / Disagreement

Participants exhibit disagreement regarding which curves are correct for heating and cooling naphthalene, with multiple competing views presented without a clear consensus.

Contextual Notes

Participants reference different sources and personal experiences, indicating potential limitations in their understanding or the information available. The discussion does not resolve the discrepancies in the curves.

Who May Find This Useful

Individuals interested in phase changes, thermodynamics, or experimental data related to naphthalene and similar substances may find this discussion relevant.

xunxine
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When going through topics on melting and freezing, i came across 2 graphs of slightly different curvature for both the heating and cooling of naphthalene.

The ending part of the graphs are the ones that confuse me, whether slope upwards or downwards. Most graphs in the internet just show straight lines or some curve one way, some the other way.

(Pls refer to attached)
Heating curve: A or B?
Cooling curve: C or D?

Also, would the graph be similar to another substance, say stearic acid?
Thanks much!
 

Attachments

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  • cooling curve1.JPG
    cooling curve1.JPG
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I'd say C is the correct cooling curve, according to Wikipedia.

I think B is the correct heating curve, but don't quote me on it.
 
Thanks, espen180! Those are my answers too.

But someone told me it should be A and D since they follow the shape of the curve at the beginning.
 
any1 know how to toooooth!
 
i did dis lab in skol... an wat i really want to know is the kinetic theory to account for the shape of the graph... can any1 pleasezz help! :-(
 
ohhhhhh an in the cooling graph C is correct curve...
 

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