1. Scientists investigate the possibility of building human settlements on Europa, a Galilean moon of Jupiter. What type of thermodynamic system is Europa? A. Open B. Closed C. Isolated D. Cannot be determined

2. Which of the following statements regarding properties of matter is/are CORRECT? A. Extensive properties are dependent on the amount of matter present. B. Extensive properties are exhibited by all samples of a substance. C. Intensive properties include color, crystalline shape and refractive index. D. All of the above.

3. The cyclic process ABCA involves a decrease in property X. What type of thermodynamic property is X? A. State B. Non-state C. Cyclic D. None of the choices

4. Air liquefies when the molecules are forced closer to each other while lowering the temperature. What happens to the internal energy (U) of the system during the process? A. U increases due to the work done on it. B. U decreases due to the heat released to the surroundings. C. U remains unchanged because it released the same energy that it acquired. D. No conclusion can be made because of insufficient information.

5.Which of the following is/are TRUE regarding the entropy change of the transition: C6H6(g) C6H6(l)? A. The entropy change is dependent on the heat of condensation of C6H6. B. The entropy change of the system decreases during the transition. C. The entropy change of the transition is inversely related to the boiling point of C6H6 D. All of the above.

6. The enthalpy of formation, ΔHf of ammonia NH3(g), is -46 kJ/mol at 25°C. If the ΔS for this reaction is 193 J/mol at the same temperature, which of the following is a valid prediction? A. The formation of ammonia is NOT spontaneous at 25°C. B. The formation of ammonia is spontaneous at ANY temperature. C. The formation of ammonia is NOT spontaneous at T > 25°C. D. The formation of ammonia is spontaneous only when at T < 25°C.

7. Transition State Theory better explains reaction kinetics than Collision Theory. This fact is due to which of the following considerations? A. Molecules are not rigid. B. Molecules do not collide due to nuclear repulsion. C. Reacting molecules will only keep a minimum distance between them resulting in a short-lived transition-state species. D. All of the above.

8. The nature of reactants dictates the rate of a reaction. This statement supports both theories on reaction rates. EA (activation energy) and ETS(energy of transition state) are both dependent on the kind of reactants used in a given reaction system. Which of the following statements in true? A. High EA, high ETS, fast reaction B. Low EA, high ETS, fast reaction C. High EA, low ETS, slow reaction D. Low EA, low ETS, fast reaction

9. Which of the following statements is TRUE about food preservation? A. Addition of salt slows down the decomposition of food because it lowers the freezing point of the substances. B. Cooked rice easily gets spoiled during summer because bacteria are more active at higher temperature. C. To slow down the decomposition of marine produce, the products are stored below 0°C because frozen water on surfaces decreases the surface area. D. To prolong shelf life, food coloring is added because they increase the activation energy of the decomposition process.

10. Which curve represents the catalyzed conversion of R to P? R + cat R-cat R-cat P + cat A. Curve A B. Curve B C. Curve C D. Curve D

11. Given the reaction mechanism: 2N2O(g) + Au(s) (N2O)2 – Au (N2O)2 – Au (N2)2 – Au + O2 (N2)2 – Au 2N2 + Au(s) A. (N2O)2 – Au is the heterogeneous catalyst and N2 and Au are the products. B. Au is the heterogeneous catalyst and N2 and O2 are the products. C. (N2O)2 - Au is the heterogeneous catalyst and N2 and O2 are the products. D. Au is the heterogeneous catalyst and (N2O)2 – Au, (N2)2 – Au, O2 and N2 are the final products.

12. Which of the following is true about the decomposition of SnO2(s) and H2(g) into Sn(s) and H2O(g) at equilibrium? A. The amount of H2 changes at a rate equal to the rate at which the amount of H2O changes. B. The amount of SnO2 does not change with time. C. The pressure of the system is constant. D. All of the choices.

13. A system in equilibrium means that: A. ΔH = TΔS B. ΔH = -TΔS C. ΔH < TΔS D. ΔH > TΔS

14. Which of the following is the correct expression for Keq of the reaction: SO2(g) + O2(g) ↔ SO3(g) (unbalanced)

A. Keq = 2[SO3] / 2[SO2][O2] B. Keq = [SO3] / [SO2] + [O2] C. Keq = [SO3]2 / [SO2]2[O2] D. Keq = [SO3]1/2 / [SO2]1/2[O2]

15. Given the equation: CaCO3(s) ↔ CaO(s) + CO2(g). Which of the following will increase the yield of CO2(g) from this reaction?

A. Increasing the pressure B. Increasing the volume C. Addition of CaCO3 D. Addition of a catalyst

16. Which of the following is TRUE when water is added to a 0.50 M solution of a weak base?

A. The concentrations of the dissociated ions will remain the same. B. The basicity of the solution will decrease. C. The [OH-] will equal the initial concentration. D. Then concentrations of the dissociated ions will increase.

17. Which of the following best describes the concentrations of species in an aqueous solution of the weak base, B?

A. B >> OH- > BH+ B. B = BH+ = OH- C. B >> BH+ = OH- D. B << OH- < BH+

18. Ethane, C2H6(g) can be formed by the reaction of ethane, C2H4(g) with hydrogen gas: C2H4(g) + H2(g) C2H6(g) Use the following heats of combustion to calculate the heat change for the formation of ethane from ethane and hydrogen gas. 2H2(g) + O2(g) 2H2O(l) ΔH = -572 kJ 3C2H4(g) + 9O2(g) 6H2O(l) + 6CO2(g) ΔH = -4203 kJ 2C2H6(g) + 7O2(g) 6H2O(l) + 4 CO2(g) ΔH = -3100 kJ

A. -1675 kJ B. -3237 kJ C. -137 kJ D. -7875 kJ

19. For the process of melting ice, ΔH = 333 J/g and ΔS = 1.22 J/g∙K. Assume that these values are constant from -5.0°C to +5.0°C. Which of the following is TRUE? Determine ΔG to support your answer.

A. 5.0 g of ice at 0°C melts to 5.0 g of liquid water at 0°C B. 5.0 g of superheated ice at +5.0°C melts to 5.0 g of liquid water at +5.0°C C. 5.0 g of ice at -5.0°C melts to 5.0 g of undercooled liquid water at -5.0°C. D. Only B and C are true. E. Only A and B are true.

*superheated – solid beyond its melting point *undercooled – liquid beyond its freezing point

20. Which is the strongest acid? A.Benzoic Acid (pKa = 4.204) B.Codeine (pKa = 8.17) C.Cresol (pKa = 10.29) D.Formic Acid (pKa = 3.751)

Answers: 1. A 2. D 3. B 4. D 5. D 6. B 7. C 8. D 9. B 10. D 11. B 12. A 13. A 14. C 15. B 16. B 17. C 18. C 19. E 20. D