2. Consider the following four compounds: 

Which of these compounds would have the same physical properties (melting point, boiling point, density, and so on)?
(A) I and II;
(B) I and III;
(C) II and III;
(D) III and IV;
(E) I and IV.

1. Radioactive elements decay via first-order kinetics. Consider a certain type of nucleus that has a rate constant of 2.6✕10–2 h–1. A sample contains 6.5✕108 radioactive nuclides. Calculate the time required for 61% of the nuclides to decompose. (A) 1.9 ✕101 h; (B) 1.6✕101 h; (C) 0.8✕101 h; (D) 3.6✕101 h; (E) 2.4✕101 h

3. Which of the following statement about biomolecules is incorrect? (A) Protein synthesis takes place in the cytoplasm of the cell. (B) Each gene in the DNA molecule codes for a specific protein. (C)Messenger RNA can be found in both the nucleus and the cytoplasm of each cell. (D)When a peptide bond is formed, H2O is produced. (E)All of these statements are true.

4. What is the most abundant (by mass) element found in the human body? (A) carbon; (B) hydrogen; (C) calcium; (D) oxygen; (E) water.

5. Calculate the molality of a solution containing 21.2 g of C6H12O6 in 249.6 mL of water (assume the density of water : 1.00 g/mL; density of the solution : 1.05 g/mL;). (A) 0.471 m; (B) 0.435 m; (C) 0.0783 m; (D) 0.00841 m; (E) 0.458 m

6. Consider the molecular-orbital description of the NO– anion. Which of the following statements is false? (A) NO– is paramagnetic; (B) NO– is isoelectronic with CO; (C) The bond energy in NO+ is greater than the bond energy in NO–; (D) The bond order in NO– is 2; (E) All of these statements are false.

7. Which of the following statements about solids is false? (A) The hexagonal closest-packed structure is ABAB.... (B) A body-centered cubic unit cell has four atoms per unit cell. (C) For unit cells having the same edge length, a simple cubic structure would have a smaller density than abody-centered cube. (D) Atoms in a solid consisting of only one element would have six nearest neighbors if the crystal structurewas a simple cubic array. (E) All the statements are correct.

8. What is the rate law for the following reaction, given the data below? (A) Rate = k[NO]; (B) Rate = k[NO]2; (C) Rate = k[NO]2[H2]; (D) Rate = k[NO][H2]; (E) Rate = k[N2O][H2O]

9. Consider the following molecules: I. BF3 ; II. CHBr3 (C is the central atom.) ; III. Br2 ; IV. XeCl2 ; V. CO ; VI. SF4Which of these molecules violate the octet rule? (A) I, II, IV; (B) I, III, IV, VI; (C) III, V, VI; (D) I, IV, VI; (E) I, II, IV, VI

10. The wavelength of light associated with the n = 2 to n = 1 electron transition in the hydrogen spectrum is 1.216✕10–7 m. By what coefficient should this wavelength be multiplied to obtain the wavelength associated with the same electron transition in the Li2+ ion? (A) 1/9; (B) 1/7; (C) 1/4; (D) 1/3; (E) 1

11.For a reaction in a voltaic cell, both △H° and △S° are positive. Which of the following statements is true? (A) E°cell will increase with an increase in temperature. (B) E°cell will decrease with an increase in temperature. (C) E°cell will not change when the temperature increases. (D) G° > 0 for all temperatures. (E) None of the above statements is true.

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