thermodynamics- phase equilibria (Gibb's free energy)

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7 Terms

1
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what is fusion

freezing or melting

2
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what is vaporisation

condensation

3
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what is sublimation

  • the process of direct conversation of a solid into gas phase

  • sublimation= fusion + vaporisation

4
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what does fusion (melting) require

requires the input of energy and is endothermic

5
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what direction does phase transition occur in

in the direction of lower free energy

6
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Gibbs phase rule

F= C - P + 2

where F is the number of degrees of freedom
C is the number of components
P is the number of phases

7
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measurement if heat effects

  • differential scanning calorimetry

  • used by virtually all pharmaceutical companies

  • sample is heated in a small aluminium pan and the heat change noted as a function of temperature

  • energy difference between sample and reference measured