複選題

8. Consider a vessel containing the following exothermic reaction at equilibrium:

2 SO₂ (g) + O₂ (g) ⇌ 2 SO₃ (g)

Which changes would increase the amount of O₂ (g) present?
(A) Cooling the reaction
(B) Doubling the volume of the reaction vessel
(C) Adding SO₂ (g)
(D) Adding a catalyst
(E) None of the previous answers.

4. For the reaction HCONH2(g) = NH3(g) + CO(g), = 4.84 at 400 K. If AH° for this reaction is 29 kJ/mol, what is the approximate at 300 K? (A)(B) (C) 27 (D) 89 (E) 0.26

5. Consider a sample of 1 mol Kr (g) at a given temperature contained in a given volume. Which of the following statements are false? (A) The entropy of 1 mol Kr (g) is less than that of 1 mol Kr (s) at the same temperature. (B) The entropy of the sample is less than that of a 1 mol sample C4H10 (g) at the same temperature, contained in the same volume. (C) The entropy of the sample increases when the temperature is doubled. (D) The entropy of the sample decreases when the volume of the container is reduced (assuming the same initial and final temperatures). (E) Rotational and vibrational motions do not contribute to the overall entropy of the sample.

6. What is the characteristic wavelength of an electron with a kinetic energy of 9.00 x J? (A) 444 nm (B) 369 pm (C) 590 pm (D) 16.4 pm (E) 0.198 pm

7. Which of the following statements is true? (A) Molecules containing polar bonds must be polar molecules. (B) Hydrogen bonding is generally stronger than ionic bonding. (C) London dispersion forces are only present between non-polar molecules. (D) Resonance structures of a molecule interchange in rapid, reversible, equilibrium (E) Liquid methanol (CH3OH) exhibits intermolecular hydrogen bonding interactions.

9. Identify the orbital in the illustration:  (A) 3d (B) 3p (C) 4d (D) 4p (E) 5d

10. Consider the following salts and choose the true statement: (A) NiCO3 has the greatest molar solubility. (B) NiCO3 has a greater solubilty in g/L than PbF2. (C) PbI2 has a greater solubilty in g/L than NiCO3. (D) Addition of iodide to a solution of PbI2 will result in a decrease of its . (E) None of the above statements are true. 

1. What is the bond angle between the two N,N-dimethyl groups of N,N-dimethylpropionamide? (A) 90° (B) 107° (C) 109.5° (D) 120° (E) 180°

2. Which of the following compounds possess the most acidic C-H bond (as highlighted). (Image of 5 compounds A-E)(A)(B)(C)(D)(E)

3. Determine the identity of the compound based on 13C NMR shown below. (Image of 13C NMR spectrum and 5 compounds A-E)(A) (B)(C)(D)(E)

4. Which of the following is a valid Fischer projection for D-(+)-xylose? (Image of D-(+)-xylose and 5 Fischer projections A-E)(A)(B)(C)(D)(E)