18. Which of the following is paramagnetic?
(A)
(B)
(C)
(D)(E

14. What is the purpose of a moderator surrounding the uranium cylinder in a nuclear (fission)reactor core?(A) To slow down the neutrons(B) To accelerate the neutrons(C) To produce a particles(D) To absorb B particles(E) To absorb the neutrons

15. Which of the following instruments is/are used to detect and measure radioactivity levels?I. Geiger counterII. Richter scaleIII. Seismic scaleIV. Scintillation counter(A) I only (B) III only (C)I&IV (D)I&I(E) I, I, II&IV

16. How many of the following ligands are capable of linkage isomerism? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

17. You analyze for pyridine () by dissolving 0.1000 g of the complex in 100 mL of H2O and titrating with a 0.01 M HCI solution. Which of the following indicators should be used to detect the endpoint? (Assume that the initial concentration of pyridine is approximately 0.01 M.) (A) thymol blue, pH range of color change = 8.0-9.6 (B) methyl red, pH range of color change = 4.8-6.0 (C) bromophenol blue, pH range of color change = 3.0-4.6 (D) bromothymol blue, pH range of color change = 6.0-7.6 (E) alizarin yellow, pH range of color change = 10.1-12.0

19. Which of the following statements about biomolecules is TRUE? (A) Messenger RNA can be found in both the nucleus and the cytoplasm of each cell. (B) Nonpolar groups tend to face the outside of a protein in aqueous solution. (C) Nucleic acids are made of nucleotides joined together with amide bonds. (D) A glycosidic linkage in polysaccharides is an ester group. (E) Table sugar is formed from B-D-glucose and B-D-fructose.

20. Arrange the following species from lowest to highest ionization energy: (A)(B) (C) (D) (E)

21. The molar mass of a solid as determined by freezing-point depression is 10% higher than the true molar mass. Which of the following experimental errors could not account for this discrepancy? (A) Before the solution was prepared, the container was rinsed with solvent and not dried. (B) Some solid was left on the weighing paper. (C) Not all the solid was dissolved. (D) The solid dissociated slightly into two particles when it dissolved. (E) More than the recorded amount of solvents was pipetted into the solution.

22. What is the formula for the compound that crystallizes with a cubic closed packed array of sulfur ions, and that contains zinc ions in 12.5% of the tetrahedral holes and aluminum ions in 50% of the octahedral holes? (A) ZnAISA (B) ZnA12S4 (C) ZnAlS2 (D) ZnAl2S2 (E) ZnAl4S8

23. Metal X has a body-centered cubic structure. If the atomic radius of X is R, what is the edge length of the unit cell? (A)2R (B)√2R (C) (D) (E) √3 R

24. Samples of the gases H2(g) and SO2(g) have equal masses and are at the same temperature and pressure. Calculate the ratio of rates of impact with the walls (H2:SO2). (A) 180 (B) 32 (C) 5.6 (D) 1.0