78. The entropy change of a system (AS) is _____for exothermic reactions and _____ for endothermic reactions.
(A) unfavorable, unfavorable
(B) favorable, unfavorable
(C) favorable, favorable
(D) unfavorable, favorable
(E) none of the above

74. When a molecule absorbs a photon, the molecule is promoted to an excited state M＊. The rate at which M＊ is created is proportional to the concentration of M. There are three pathways that M* may take to return to the ground state. Which statement about these three pathways below is wrong? (A) The rate at which the excited state returns to the ground state is independent of the pathway to the ground state and the concentration of excited state molecules. (B) The three possible pathways to return to the ground state are emission, deactivation, and quenching. (C) Quenching occurs when a second molecule, the quencher Q, collides with M* and energy is transferred from M* to Q: M* + Q→M+Q*. (D) Deactivation returns M* to the ground state by colliding with other molecules and releasing energy in the form of heat: M* → M + heat. (E) Emission returns M* to the ground state by emitting a photon: M* → M + hv.

75. A novel analytical method named ______ may enhance the fluorescence of immunoassays by a factor of 100 by measuring the fluorescence of Eu3+ 200 us after excitation with a laser pulse. (A) time-resolved fluorescence immunoassay (B) time-dependent fluorescence immunoassay (C) immunoassay fluorescence over time immunoassay (D) weakly bound time fluorescence immunoassay (E) europium-bound fluorescence immunoassay

76. Given that S = 131 J/K mol for H2(g), estimate the value of AS for the reaction: Ti(s) + H2(g) → TiH2(s) (A) 0 J/K (B) 131 J/K (C) -131 J/K (D) 262 J/K (E) -262 J/K

77. Which of the following exhibits the correct (increasing) orders for the atomic radius r and the ionization energy (IE), respectively? (A) r: F＜S＜O, IE: O ＜ S ＜F (B) r: F＜O ＜ S, IE: S ＜O ＜F (C) r: S＜O＜ F, IE: F ＜ O ＜S (D) r: S＜F＜ O, IE: S ＜ F ＜0 (E) none of the above

79. Using a 400 MHz 1H NMR instrument, if a hydrogen atom shows a quartet at δ = 4.06, 4.03, 4.00, 3.97 ppm, please calculate it's coupling constant. And where will this triplet peak shows up at a 600 MHz H NMR instrument? (A) 12 Hz; δ: 4.035, 4.015, 3.995, 3.975 ppm (B) 12 Hz; δ: 4.045, 4.025, 4.005, 3.985 ppm (C) 12 Hz; δ: 4.025, 4.005, 3.985, 3.965 ppm (D) 6 Hz; δ: 4.045, 4.025, 4.005, 3.985 ppm (E) 6 Hz; δ: 4.035, 4.015, 3.995, 3.975 ppm

80. What is the product of the following reaction? (A)(B)(C)(D)(E)

81. There are many types of noise in instrumental analysis. Which of the following descriptions about the different noise types is INCORRECT? (A) line noise - noise that occurs at discrete frequencies (B) drift noise – low frequency noise caused by flickering or drifting of light intensity (C) Gaussian noise – noise amplitude is dependent on frequency (D) Johnson noise - random fluctuations of electrons in electronic devices (E) shot noise - noise that arises from random variation in the number of photons reaching the detector or small number of electrons and holes generated in a semiconductor

82. One of the optical components of a spectrophotometer that selects the wavelength to irradiate the sample can be called the _____.(A) polychromator (B) monochromator (C) beam splitter (D) light source (E) optode

83. What is the key functional group present in penicillins that is essential for their antibacterial activity? (A) amide (B) carboxyl group (C) B-lactam ring (D) ether (E) thiophene group

84. Indium has atomic number 49 and atomic mass 114.8 g. Naturally occurring indium contains a mixture of indium-112 and indium-115 in an atomic ratio of approximately_____. (A) 25/75 (B) 75/25 (C) 50/50 (D) 94/6 (E) 6/94