3. In which of these molecules does carbon have an oxidation state of 0?
(A) CO₂
(B) H₂CO
(C) CH₄
(D) HCCl₃
(E) None of the previous answers

19. Nuclear envelope breakdown occurs at the _ of _. (A) end; prometaphase (B) end; metaphase (C) beginning; anaphase (D) beginning; prophase (E) end; prophase

20. A proto-oncogene is a gene ______. (A) from a normal cell from which an oncogene can arise (B) that has been picked up by an oncogenic virus (C) that is in the process of evolving into an oncogene (D) that is expressed abnormally in a tumor cell (E) that has been mutated to alter cell growth control

1. How many significant figures should be reported for the answer to the following calculation? (1.0045 – 0.0013) (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

2. Which of these atoms does not obey the octet rule? (A) S in SF4 (B) Si in SiCl4 (C) P in PC13 (D) N in N2 (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.

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.

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