18. In the phase diagram of one component system, pressure is plotted as a function of temperature. During the transition from liquid state to vapor state, which of the following is true?

(A)(dP/dT) is positive

(B)it is endothermic reaction

(C)the volume change from solid to vapor is increasing

(D)all of above are correct

1. Indicate the wrong statement for the definition of isolated system in the following, (A)no energy interchanged in the system (B)no energy exchange with the surrounding (C)no expansion or contraction of the system (D)no work done by the system (W = 0) (E)no heat entering from outside (Q = 0)

2. Indicate the wrong statement for the definition of closed system in the following, (A)energy can be interchanged in the system (B)the volume of the system is constant (C)no mass enters or leaves the system (D)work can be done by the system (W \( \neq \) 0) (E)heat can enter the system (Q \( \neq \) 0)

3. Which function is a path function, (A)Gibbs free energy (B)Entropy (C)Work (D)Enthalpy (E)Temperature

4. Consider that one mole of ideal gas expands from V1=10 liters to V2=20 liters, through three different reversible paths, (1) isobarically, (2) isothermally, and (3) adiabatically, then the work done would be, (A)W1 > W2 > W3 (B)W1 > W3 > W2 (C)W2 > W3 > W1 (D)W2 > W1 > W3 (E)W3 > W1 > W2

5. CP is equal to CV at (A)0K (B)0°C (C)298K (D)398K (E)near melting point

6. About the monoatomic ideal gas, which of the following description is correct, (A)(\( \partial \)U/\( \partial \)V)T < 0 (B)(\( \partial \)T/\( \partial \)P)H = 0 (C)\( \alpha \) = (1/V)(\( \partial \)V/\( \partial \)T)P = 1/273 (D)S = CV/R (E)CP = 3R/2

7. About the thermodynamic equation, which of the following is correct, (A)T = (\( \partial \)U/\( \partial \)S)V (B)T = (\( \partial \)H/\( \partial \)S)V (C)T = (\( \partial \)A/\( \partial \)S)V (D)T = (\( \partial \)G/\( \partial \)S)V (E)none of above is correct

8. About ideal gas, (A)An ideal gas is an assemblage of volumeless noninteracting particles which obeys the ideal gas law, PV = RT. (B)The internal energy of an ideal gas arises solely from the translational motions of the gas particles and hence is a function only of temperature, (C)The enthalpy of an ideal gas is a function only of temperature, (D)The internal energy U is constant with respect to the gas volume, i.e. (dU/dV)T = 0, hence the pressure P can be expressed as P = (dS/dV)T, (E)The above are all correct.

9. The numbers of ways in which the particles can be distributed in space is related to the concept of the thermodynamic property (A)thermal entropy (B)degree of mixed-up-ness (C)enthalpy (D)configuration entropy

10. When pressure is constant, enthalpy is equivalent to (A)heat (B)internal energy (C)entropy (D)work

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