(la). (5p) For a given pressure, the temperature of a pure substance during the phase change from liquid to vapor D. Increases . Decreases :). Remains constant ). There is

no correlation (Ib). (5p) The critical point of a substance is the point on the T-V or P-V diagram where(A). Vf and Vg meet (A). Vf and Vg meet (B). properties of saturated fluid and saturated vapor are the same (C). Above this point there is no distinct phase change process observed (D). All of the above. (lc). (5p) By studying the compressibility chart we can infer that ideal gas assumption has good accuracy (A). For temperatures much higher than the critical temperature regardless of the pressure (B). Close to critical point of the substance (C). For pressures much lower than the critical pressure, regardless of temperature (D). All of the above (Id). (5p) For a certain pure substance, at given pressure which of the following conditions suggest that the state of the substance is in superheated condition (A). T > Tsat- (В). V > Vg (C). Quality (X)<1 (D). All of the above