18. A 17.3 mg sample of an organic compound (a non-electrolyte) was ground up with 420 mg of camphor to form a homogeneous mixture melting at 168 ℃. Which is the possible organic structure? ( of camphor = 37.7 ℃/m, m.p. of camphor = 178.4 ℃)
(A)
(B)
(C) 
(D)
(E)

1. Which species has the largest O-N-O angle? (A)FNO2 (B) NO2 (C) (D)(E)

2. The Ka of the pyridinium ion, , is 5.9 x . What is the pH of 0.120 M solution of pyridine C5H5N?(A) 3.00 (B) 9.15 (C) 7.97 (D) 4.78 (E) 8.82

3. Aluminum crystallizes in a face-centered cubic unit cell with an edge length of 380 pm. What is its density? (Al, M=26.98 g/mol) (A) 1.58 g cm-3 (B) 0.73 g cm-3 (C) 3.27 g cm-3 (D) 3.89 g cm-3 (E) 5.40 g cm-3

4. Which reaction has ＞0? All reactants and products are liquids. (A)(B)(C)(D)(E)

5. A 2.0 L container with 2.00 atm Ar gas is connected by a stopcock to 4.0 L container containing 1.0 atm Kr gas. Which statement accurately describes the system after the stopcock is opened and the system is allowed to reach equilibrium? The temperature is 25 °C throughout the experiment. (A) The total pressure is 2.0 atm. (B) The number of moles of Ar in the 2.0 L container is equal to the number of moles of Kr in the 4.0 L container. (C) The average speed of the Ar atoms is equal to the average speed of the Kr atoms. (D) The partial pressure of Ar is equal to the partial pressure of Kr. (E) The partial pressure of Ar is larger than the partial pressure of Kr.

6. How many unpaired electrons does a ground-state gas-phase ion have? (Atomic number of Fe=26) (A) 1 (B) 2 (C) 5 (D) 3 (E) 6

7. Which charge(s) on an N2 ion would give a bond order of 2.5? (A) -2 (B) -1 (C) 0 (D) +1 (E) +2

8. Which nuclide undergoes beta decay? (A) (B) (C) (D) (E)

9. You are diluting an aqueous glucose solution. First, add 0.99 mL of water twice into a vial, and then add 100.0 uL of glucose solution. If the weight of the final solution is 2.1254 g, what is the correct expression for the solution density (g/mL)? (A) 1.021826 (B) 1.0218 (C) 1.021 (D) 1.02182 (E) 1.02

10. To a solution that is 0.01 M each in fluoride, sulfite, and phosphate ions is added dropwise a 1.00 M solution of CaCl2. In what order will solids precipitate? (A) First Ca3(PO4)2, then CaF2, last CaSO3 (B) First Ca3(PO4)2, then CaSO3, last CaF2 (C) First CaSO3, then, CaF2, last Ca3(PO4)2 (D) First CaF2, then CaSO3, last Ca3(PO4)2 (E) First CaF2, then Ca3(PO4)2, last CaSO3

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