20. Which intermolecular force is the strongest?
(A) dipole-dipole interactions;
(B) London dispersion forces;
(C) hydrogen bonding;
(D) ionic bonding;
(E) polar covalent bonds 

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

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.

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

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