7. Given the phase diagram of a hypothetical substance, answer the following que

Question

7. Given the phase diagram of a hypothetical substance, answer the following questions: (a) Indicate the phases at points X, Y, Z, A and B (b) As you move from E to C, what phase changes happens to the substance. (c) As you move from C to D, indicate what transformations can occur to the substance. (d) As from F to E, what are all the changes happens to the substance (f) What is the name of tie line AB in the phase diagram? Name the phases of the substance on the tie line AB. (g) Above point B, how many phase are present? (h) How many phases are there at the point A? (i) When a line is drawn across (perpendicular to x-axis), the line will intersect at two points. Show them on the diagram and describe the phase that can take place at each of the intersecting point. 183 Pressure atm 1.50 1 10 1 15075 0 Temperature ( C

Explanation / Answer

For X will be solid

For Y will be liquid

For Z will be gas

A is the triple point in this "stage" there is an equilibrium between solid, liquid, gas

B is a critical point, at the critical point the saturated liquid and the saturated vapor states are identical

Moving from E to C, you go from solid state to liquid state, this will be a melting

Moving from C to D, you go from liquid to vapor, this will be an evaporation

Moving from F to E, you go from vapor to solid, this will be a deposition

The lines are called lines of equilibrium or phase boundaries on the AB line the gas and liquid phases coexists

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