6. Rank from smallest to largest in terms of atom/ionic radii.
(A)
(B)
(C)
(D)
(E)

7. Which of the following statements is true concerning ideal gases? (A) The temperature of the gas sample is directly related to the average velocity of the gas particles. (B) At STP, 1.0 L of Ar(g) contains about twice the number of atoms as 1.0 L of Ne(g) because the molar mass of Ar is about twice that of Ne. (C)A gas exerts pressure as a result of the collisions of the gas molecules with the walls of the container. (D) The gas particles in a sample exert attraction on one another. (E) All of these statements are false.

8. A Lewis dot structure for benzene, CH would give two equivalent resonance structures for this cyclic molecule with alternating single and double bonds A combined LCAO and MO picture for the bonding of the carbon atoms in benzene would be (A) 10(Csp²-Csp²) bonds between each C atom, and 3π MO delocalized over the C's (B) 20(Csp3-Csp³) bonds between each C atom, and 1 7π MO delocalized over the C's (C) 10(Csp³ Csp³) bonds between each C atom, and 1tMO delocalized over the C's (D)1(Csp2-Csp²) bonds between each C atom, and 21 MO delocalized over theC's (E) 30(C2p-C2p) bonds between each C atom 

9. Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution is 5.144°C. Pure benzene freezes at 5.444°C and has a value for the molal freezing-point-depression constant of of 5.12°C/m. What is the molar mass of thyroxine? (A) 7770 g/mol (B) 777 g/mol (C) 2330 g/mol (D) 285 g/mol (E) 3760 g/mol

10. Which of the following shows these molecules in order from most polar to least polar? (A) CH4＞ CF2Cl2 ＞ CF2H2 ＞ CC14 ＞ CCl2H2 (B) CH4 ＞ CF2H2 ＞ CF2Cl2 ＞ CC14＞ CC2H2 (C) CF2H2 ＞ CCl2H2 ＞ CF2Cl2 ＞ CH4 = CC14 (D) CF2Cl2 ＞ CF2H2 ＞ CCl2H2 ＞ CH4 = CC14 (E) CF2Cl2 ＞ CF2H2 ＞ CCl4 ＞ CCl2H2 ＞ CH4

11. Which of the following statements are true about starch? I. The monomers are fructose and glucose. II. The monomer is glucose. III. It is the main carbohydrate reservoir in plants. IV. It is the main carbohydrate reservoir in animals. V. It is an addition polymer. VI. It is a condensation polymer. (A) I, III, IV, V (B) II, IV, VI (C) II, III, VI (D) I, III, V (E) I, IV, V

12. The octahedral compound [FeCl3(NH3)3] is found to be paramagnetic. This means (A) it must be a high spin complex. (B) it must be a low spin complex. (C) it could be either a high spin or low spin complex. (D) it has a crystal field stabilization that is zero. (E) a & d

13. Which one of the following statements about the structure of proteins is incorrect? (A) Disulfide bonds provide strong intrachain interactions. (B) Hydrogen bonding stabilizes the a-helix proteins. (C) Nonpolar groups tend to face the outside of a protein in an aqueous solution. (D) Ionized amino acid side chains can form salt bridges within a protein. (E) Heat can disrupt tertiary structure.

14. Helium effuses through a small opening at a rate of 1×. An unknown gas at the same temperature and pressure is found to effuse through the same opening at a rate of 3.78× mol .What is the molecular mass of the unknown gas? (A) (B) (C) (D)(E)

15. It is desired to determine the concentration of arsenic in a lake sediment sample by means of75 neutron activation analysis. The nuclide  captures a neutron to form , which in turn  undergoes ẞ decay. The daughter nuclide produces the characteristic y rays used for the analysis. What is the daughter nuclide? (A)(B) (C)(D)(E)

16. What is the complementary nucleic acid sequence for the DNA sequence GAC TAC GTT GGC? (A) GAC TAC GTT GGC (B) TCA GCA TGG CTA (C) CGA GTG CAT CAG (D) GCG AAG GGG TTG (E) CTG ATG CAA CCG

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