Visualize a substance with the following points on the phase diagram: a triple point at 0.05 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.) Roughly sketch the phase diagram, using units of atmosphere and Kelvin. Label the area 1, 2, and 3, and points T and C on the diagram. (20 points) Describe what one would see at pressures and temperatures above 2.0 atm and 450 K. (5 points) 2.) Describe the phase changes from 50 K to 250 K at 1.5 atm. (5 points) 3.) What exists in a system that is at 1 atm and 350 K? (5 points) 4.) What exists in a system that is at 1 atm and 175 K? (5 points)