5. The symbol [Kr] represents
(A)
(B)
(C)
(D)

1. Which has the least kinetic energy? (A)a 1200 kg object moving at 90 km/hr (B) a 1400 kg object moving at 85 km/hr (C) a 1600 kg object moving at 80 km/hr (D) a 1800 kg object moving at 75 km/hr

2.What group of elements does the shaded area in the following periodic table indicate?   (A)gases (B) metals (C) nonmetals (D) semimetals

3. Aluminum metal reacts with aqueous iron(ll) chloride to form aqueous aluminum chloride and iron metal. What is the stoichiometric coefficient for iron when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients? (A)0 (B)3 (C)5(D)8

4. What is the first ionization energy for a hydrogen atom in the ground state? The Rydberg constant is . (A)(B) (C)(D) 0.00823

6. Which have the largest number of unpaired electrons in p orbitals in their ground-state electron configurations? (A)N, As, Bi (B) F, At, Br (C) Ne, Ar, Xe (D) B, Ga, TI

7. Assign formal charges to each atom in the resonance form for SOCl2 given below. (A)0 for Cl, O for S, and O for O (B) 0 for CI, +1 for S, and -1 for O (C) -1 for CI, +4 for S, and -2 for O (D) -1 for CI, -2 for S, and -2 for O

8. Which of the following would be expected to have sp2 hybridization on atom A? (A)II (B) I and III (C) I, Il, and Ill (D) I and IV

9. The MO diagram below is appropriate for B2 (Boron atom), Based on this diagram, B2 (A)has a bond order of one and is diamagnetic. (B) has a bond order of one and is paramagnetic. (C) has a bond order of two and is diamagnetic. (D) has a bond order of two and is paramagnetic.

10. Calculate the work energy, w, gained or lost by the system when a gas expands from 20 L to 35 L against a constant external pressure of 2.0 atm.[1 Lㆍ atm = 101 J] (A)-5.3 kJ (B) -3.0 kJ (C) +3.0 kJ (D) +5.3 kJ

11. When 50.0 mL of 0.400 M Ca(NO3)2 is added to 50.0 mL of 0.800 M NaF, CaF2 precipitates, as shown in the net ionic equation below. The initial temperature of both solutions is 30.00℃. Assuming that the reaction goes to completion, and that the resulting solution has a mass of 100.00 g and a specific heat of 4.18 J/(g ㆍ ℃), calculate the final temperature of the solution. (A)29.45℃ (B) 30.55℃ (C) 31.10℃ (D) 31.65℃

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