Flashcards in Questions from class - Lecture 7 Deck (4)

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1

## Which important parameter appears in the enthalpy of mixing and how does it depend on temperature?

### The Flory-Huggins interaction parameter. It goes as 1/T, but will depend on the energy balance of the interactions between species A and B. When the balance is negative, the interaction parameter will increase as the temperature increases - when the balance is positive, the interaction parameter will decrease as the temperature increases.

2

## How is the stability of a mixture evaluated on the basis of the shape of the curve describing the free energy of mixing?

### When the second derivative of the free energy of mixing is greater than 0, it is stable, and when it is less than 0, it is unstable.

3

## How is the phase diagram of a mixture derived from the energy of mixing?

### Calculate free energy from many temperatures, and plot the binodal and spinodal curves from the minima and inflection points respectively.

4