CHAPTER 3 Flashcards
If on the Pxy diagram, the point lies on the dew point, is there a bubble point?
Yes, the last drop of liquid to vaporize will have the composition on the bubble line
What is complete miscibility?
Addition of A to B leads to a single A+B solution phase
What is complete immiscibility?
B has no solubility within A and vice versa. Addition of A to B leads to separate phases of pure A and B
What is partial miscibility?
A has limited solubility in B and vice versa. Mixing A and B leads to 2 phases (A-rich + B-rich)
Why does partial miscibility occur?
A has a structure that accommodates only limited amount of B due to incompatibility in size and/or chemistry
Are all miscible solutions ideal?
No
What is the miscibility gap?
Two phase region in partially miscible system diagram
What is congruent melting?
When pure BA(s) melts, it melts all at once to form a liquid of the SAME composition
Why might there be a break in T over time diagram of ss cooling?
Break is a sign that there is a formation of a new phase, hence the average Cp changed along with slope
When do breaks occur?
occurs when liquidus line is crossed and the first solid forms
Why does plateau/halt happen in in T over time diagram of ss cooling?
Plateaus signify the reaching of any invariant point (eutectic points or congruent melting/freezing of pure compound)
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