Degrees of freedom in a reacting system

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SUMMARY

The discussion centers on the classification of solid phases in a reacting system, specifically addressing why solid calcium carbonate (CaCO3) and solid calcium oxide (CaO) are considered two distinct phases. Participants clarify that despite both being solids, they represent separate phases unless they form a solid solution. This classification is compared to the behavior of oil and water, which also form two distinct liquid phases.

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  • Understanding of phase diagrams in chemistry
  • Knowledge of solid-state chemistry
  • Familiarity with the concepts of solid solutions
  • Basic principles of thermodynamics
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  • Explore the concept of solid solutions in materials science
  • Study phase diagrams and their applications in chemical reactions
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Chemists, materials scientists, and students studying phase behavior in chemical systems will benefit from this discussion.

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Hello
I am confused in part b why they classify solid CaCO3 and solid CaO as two different phases. They are both solids, which is one phase
 
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Unless they form a solid solution, they represent separate two solid phases. This is analogous to oil and water forming two liquid phases.

Chet
 

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