Phase Diagram Homework 1.) On the website there is a phase diagram practice link

Question

Phase Diagram Homework 1.) On the website there is a phase diagram practice link with 22 multiple choice questions. Complete this and print a screen shot of the final page showing your score. 2.) On the website there is a phase diagram practice link with 16 multiple choice questions. Complete this and print a screen shot of the final page showing your score. 3.) For the following questions, use this phase diagram: a. Which phase has the higher density, fcc(II) or bcc(I)? b. Why? c. What is the range of P and T where the fcc and liquid are in equilibrium? d. Does solid fcc potassium float or sink in the liquid? 4.) For the following questions, use this phase diagram: a. Could figure a be a phase Liquid diagram for a pure substance? b. Why or why not? Be specific

Explanation / Answer

Q.3 (b) bcc(I) has higher density because its the solid state

Density is mass/ volume. Solid state occupies the least volume hence, greatest density.

(c) from 580K-630K and 11GPa-16GPa (approx. Values)

For temperature, draw perpendiculars from triple point and last point of pressure to x-axis.

(d) solid fcc should float in the liquid since according to the diagram solid, fcc and liquid intersect at the triple point where all the states are in equlibrium

Q.4 (a) &(b) this can be the phase diagram of a pure substance as all the three phases are clearly visible. There is no multiplicity. You can plot exactly one critical point, melting point and boiling point.

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