Exercises: Sketch the phase diagram of a substance with the following points on the phase diagram: a triple point at 0.5 atm and 150 K; a normal melting point at 175 K; a normal boiling point at 350 K; and a critical point at 2.0 atm and 450 K. The solid liquid line is “normal” (meaning positive sloping). 1. Label the area 1, 2, and 3, and points T and C on the diagram. 2. Describe what one would see at pressures and temperatures above 2.0 atm and 450 K. 3. Describe the phase changes from 50 K to 250 K at 1.5 atm. 4. What exists in a system that is at 1 atm and 350 K? 5. What exists in a system
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Exercises: Sketch the phase diagram of a substance with the following points on the phase diagram: a triple point at 0.5 atm and 150 K; a normal melting point at 175 K; a normal boiling point at 350 K; and a critical point at 2.0 atm and 450 K. The solid liquid line is “normal” (meaning positive sloping). 1. Label the area 1, 2, and 3, and points T and C on the diagram. 2. Describe what one would see at pressures and temperatures above 2.0 atm and 450 K. 3. Describe the phase changes from 50 K to 250 K at 1.5 atm. 4. What exists in a system that is at 1 atm and 350 K? 5. What exists in a system that is at 1 atm and 175 K?
Sketch the cooling curve of a substance with the following points: (A) 85 OC and 0 min, (B) 60 OC and 2 min, (C) 60 OC and 5 min, (D) 20 OC and 8 min, and (E) 20 OC and 11 min. Label each line 1, 2, 3, and 4 and each point A, B, C, D, and E. 1. What phase(s) exist at each of the numbered sections? 2. At what temperature is the substance condensing? 3. At what temperature is the substance freezing? 4. At which numbered section/s is/are phase changes occurring? 5. At which numbered section/s is/are kinetic energy of the molecules the greatest? 6. Evaluate the change in temperature from point A to E, with regard to heat. |
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