4. In the gaseous phase, which of the following diatomic molecules would be the most polar?
(A) CsF
(B) CsCl
(C) NaCl
(D) NaF
(E) LiF

23. In the gaseous phase, which of the following diatomic molecules would be themost polar? (A) LiF (B) CsF (C) NaCl(D) CsCl

15. In the gaseous phase, which of the following diatomic molecules would be the most polar? (A) LiF (B) CsF (C) NaCl (D) CsCl

5. All of the following are in aqueous solution. Which is incorrectly named? (A) H2SO4 sulfuric acid (B) H2CO3, carbonic acid (C) H3PO4 phosphoric acid (D) HCN, cyanic acid (E) HCl, hydrochloric acid

6. The molecular structure of NO3- is (A) linear (B) trigonal planar (C) tetrahedral (D) bent (E) none of these

7. The fact that O2 is paramagnetic can be explained by (A) the Lewis structure of O2 (B) resonance (C) a violation of the octet rule (D) the molecular orbital diagram for O2 (E) hybridization of atomic orbitals in O2

8. According to the first law of thermodynamics, the energy of the universe is constant. Does this mean that ΔE is always equal to zero? (A) Yes, ΔE = 0 at all times, which is why q = -w. (B) No, ΔE does not always equal zero, but this is only due to factors like friction and heat. (C) No, ΔE does not always equal zero because it refers to the system's internal energy, which is affected by heat and work. (D) No, ΔE never equals zero because work is always being done on the system or by the system. (E) No, ΔE never equals zero because energy is always flowing between the system and surroundings.

9. Consider the following processes:Calculate ΔH for: B → E + 2C(A) 25 kJ/mol(B) 525 kJ/mol(C) -175 kJ/mol(D) -325 kJ/mol(E) none of these

10. Consider a sample of gas in a container on a comfortable spring day. The Celsius temperature suddenly doubles, and you transfer the gas to a container with twice the volume of the first container. If the original pressure was 12 atm, what is a good estimate for the new pressure? (A) 3 atm (B) 5.5 atm (C) 6.4 atm (D) 12 atm (E) 15 atm

11. A sample of N2 gas is contaminated with a gas ( A ) of unknown molar mass. The partial pressure of each gas is known to be 200. torr at 25°C. The gases are allowed to effuse through a pinhole, and it is found that gas A escapes at 2 times the rate of N2. The molar mass of gas A is: (A) 7.00 g/mol (B) 56 g/mol (C) 14.01 g/mol (D) 112 g/mol (E) none of these

12. Chromium metal (52g/mol) crystallizes as a body-centered cubic lattice. If the atomic radius of Cr is 1.25 angstroms, what is the density of Cr metal in g/cm3? (Cr=52 g/mol) (A) 5.52 (B) 7.18 (C) 14.4 (D) 2.76 (E) 3.59

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