Heating and cooling curves of naphthalene

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SUMMARY

The discussion centers on the heating and cooling curves of naphthalene, with participants debating the correct representations of these curves. User espen180 suggests that curve B is the correct heating curve, while curve C is identified as the correct cooling curve, referencing Wikipedia for validation. Another user proposes that curves A and D should be considered correct based on their initial shape. The conversation highlights the confusion surrounding the graphical representation of phase changes in naphthalene and its comparison to stearic acid.

PREREQUISITES
  • Understanding of phase changes in substances, specifically melting and freezing.
  • Familiarity with heating and cooling curves in thermodynamics.
  • Knowledge of kinetic theory as it relates to molecular behavior during phase transitions.
  • Basic graph interpretation skills for analyzing scientific data.
NEXT STEPS
  • Research the detailed heating and cooling curves of naphthalene.
  • Study the kinetic theory of matter to understand molecular behavior during phase changes.
  • Compare the heating and cooling curves of naphthalene with those of stearic acid.
  • Examine the impact of impurities on the melting and freezing points of substances.
USEFUL FOR

Chemistry students, educators, and researchers interested in thermodynamics and phase transitions, particularly those studying the properties of naphthalene and similar substances.

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

  • heating curve1.JPG
    heating curve1.JPG
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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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