10. At a particular temperature, 12.0 moles of SO₃ is placed into a 3.0 L rigid container, and the SO₃ dissociates by the reaction
2SO_3(g)⇌ 2SO_2(g) + O_2(g)
At equilibrium, 3.0 moles of SO₂ is present. Calculate K for this reaction.
(A) 0.033
(B) 0.056
(C) 0.44
(D) 0.22
(E) 0.55

6. An aqueous solution of 10.00 g of catalase, an enzyme found in the liver, has a volume of 1.00 L at 27℃. The solution’s osmotic pressure at 27℃ is found to be 0.745 torr. Calculate the molar mass of catalase. (A) 3.86 x 108 g/mol (B) 4.15 x 104g/mol (C) 9.8 x 106 g/mol (D) 3.30 x 102g/mol (E) 2.51 x 105 g/mol

7. You have 75.0 mL of 0.10 M HA. After adding 30.0 mL of 0.10 M NaOH, the pH is 5.50. What is the Ka value of HA ? (A) 2.1 x 10-6 (B) 3.8 x 10-6 (C) 4.7 x 10-2 (D) 7.4 x 10-8 (E) 6.3 x 10-4

8. Which of the following is the correct order for molecules from most to least polar? (A) CH4 > CF2Cl2 > CF2H2 > CCl4 > CCl2H2 (B) CH4 > CF2H2 > CF2Cl2 > CCl4 > CCl2H2 (C) CF2Cl2 > CF2H2 > CCl2H2 > CH4 = CCl4   (D) CF2H2 > CCl2H2 > CF2Cl2 > CH4 = CCl4 (E) CF2Cl2 > CF2H2 > CCl4 > CCl2H2 > CH4

9. Which of the following molecules exhibits chirality? I. 1-chloroethanol II. 2-chloroethanol III. 2-chloropropane IV. 2-chlorobutane V. 3-chloropentane (A) I, III (B) II, IV (C) II, III (D) I, IV (E) II, V

11. Assuming that the combustion of hydrogen gas provides three times as much energy per gram as gasoline, calculate the volume of liquid H2 (density = 0.0710 g/mL) required to furnish the energy contained in 80.0 L (about 20 gal) of gasoline (density = 0.740 g/mL). Calculate also the volume that this hydrogen would occupy as a gas at 1.00 atm and 25°C. At 1.00 atm and 25°C, the hydrogen gas needed to replace 20 gal of gasoline occupies a volume of                   L. (A) 277 (B) 19700 (C) 59200 (D) 239000 (E) 977000

12. Consider the following orderings. I. Al＜Si＜P＜Cl        II. Be＜Mg＜Ca＜Sr III. I＜Br＜Cl＜F         IV. Na+ ＜Mg2+＜Al3+＜Si4+Which of these give (s) a correct trend in ionization energy? (A) III (B) I, II (C) I, IV (D) III, IV (E) I, III, IV

13. A 0.739-g sample of an iron ore is dissolved in acid. The iron is then reduced to Fe2+ and titrated with 47.22 mL of 0.02242 M KMnO4 solution. Calculate the results of this analysis in terms of % Fe (55.847 g/mol). (A) 16 (B) 22 (C) 32 (D) 40 (E) 50

14. Which of the following are paramagnetic?  O2 O2– O22– B2 C2 N2 F2 P2 (A) O2, O22– , B2 (B) O2–, C2, N2 (C) B2, F2, P2 (D) O22–, N2, F2 (E) O2, O2–, B2

15. Name the following:   (A) 1-chloro-2-methyl-3-ethylcyclopentane (B) 1-ethyl-2-methyl-3- chlorocyclopentane (C) 1-chloro-3-ethyl -2-methylcyclopentane (D) 3-chloro-1-ethyl -2-methylcyclopentane (E) 3-chloro-2-methyl -1-ethylcyclopentane

1. Which of the followings is NOT true for cilia or flagella? (A)They are involved in cell motility. (B)They require ATP to work. (C)They are composed of microfilaments. (D)They require motor proteins to work. (E)They are composed of an internal structure called the axoneme.