複選題

5. Which of the following processes result(s) in an increase in entropy? (AB) Expanding I mol of oxygen gas isothermally to twice its original volume. (AC) Doubling the pressure of I mol of nitrogen gas isothermally. (AD) Compressing I mol of nitrogen gas isothermally to half of its original volume. (AE) Increasing the temperature of I mol of argon gas at constant pressure. (BC) Freezing the crystal of 1 g of Nacl. (BD) Water of 1 mL. losing cnergy reversibly at 25℃.

複選題1. For the reaction 2N2O5(g) 4NO2(g) + O2(g). (AB) The amount of NO2 in the reaction container is four times the amount of O2regardless how the reaction mixture is prepared for the reaction to oceur. (AC)At the moment when N2O5(g) is first transferred to the empty reaction container. the rate of disappearance of N2O5 is more than two times the rate of formation of O2. (AD) At any instant. the rate of formation of NO2 is two times the rate of disappearance of N2O5. (AE) The reaction is a second-order reaction. just like any reactions of 2M2N5 → 4MN2 + N2. (BC)If the measured initial rates are M/sec for the initial concentrations of N2O5 of 0.0050 M and 0.010 M. respectively, the overall reaction order is one. (BD) The activation energy of the reaction may be derived from measuring the rate constants at two different temperatures.

複選題2. Which of the following statements related to chemical bonding is (are) correct? (AB) The hybrid orbital used by the N atom in urea. H2NCONH2. is sp3. (AC) H2S has greater ionic character than H2O. (AD) The bond enthalpies (kJ/mol) of C-H. C-C. C=C. C-Br. H-Br. and Br-Br are 412. 348. 612. 276. and 366. and 193. respectively. The heat released when ethane. CH2=CH2. reacts with HBr to produce CH3CH2Br is 58 kJ/mol. (AE) Highly clcctroncgative atoms have low ionization energies and high electron affinities. (BC) NO2 is not a radical. (BD)The electronic configuration in the oxide ion in BaO is [He]2s22p6.

複選題3. Which of the following statements is (are) correct? (AB) Electron diffraction by a crystal can support de Broglie's hypothesis of the wave nature of matter. (AC) Ultraviolet light, microwav ves, and gamma rays travel through empty space at different speed. (AD) Speeding tickets based on the radar reading are uncertain becausc of the Heisenberg uncertainty principle. (AE) People have difficulty in measuring both the position and velocity of objects in everyday life. (BC) The kinetic energy of the electrons ejected by the incident radiation increases with the radiation intensity. (BD) For the hydrogen atom. the Lyman series of lines are found only in the ultraviolet region of the spectrum.

複選題4. Which of the following kinetics statements is (are) correct? (AB) If the rate of a reaction increases by a factor of 8 when the concentration of a reactant increases by a factor of 2. the order of the reaction with respect to this reactant is 4. (AC) Decomposition of nitrous oxide is a zero-order reaction. (AD) The rate law of a reaction can be predicted from reaction stoichiometry. (AE) The rate law of a zeroth-order reaction is rate = k. (BC) An enzyme-catalyzed reaction may appear to be zero-order if the number of enzyme molecules in the reaction is limited in relation to substrate molecules. (BD) Even complex biological processes may exhibit Arhenius behavior within certain temperature ranges.

複選題6. Which of the following statements is (are) correct? (AB) Boron is not a metalloid. (AC) In quantum systems. as the mass of the particle in a one-dimensional box becomes larger. the separation between neighboring energy levels decreases. (AD) The total number of orbitals in a shell with principal quantum number 4 is 8. (AE) The total number of nodal planes present in the orbitals having the set of quantum numbcrs n=3 and (=2 is 10. (BC) The probability of finding an electron at the nucleus in a p-orbital is zero. (BD) The zero-point energy in 1.3.5.7-octatetraene is larger than in 1.3-butadiene.

複選題7. The reaction of NO with Clz proceeds in a fixed container as follows.Which of the following statements is (are) correct? (AB) The forward rate cquals the reverse rate when the reaction is in equilibrium. (AC) The reaction rate is determined by the collision between NO(g) and Cl2(g) molecules. (AD) Increasing the concentration of Cl2(g) will increase the reaction rate. (AE) Removing NOCI(g) from the reaction mixture will increase the reaction rate. (BC) The reaction is a second-order reaction. (BD) The unit of k in the rate law of the reaction is L/mol-s. if the concentration of the reactant is expressed in mol/L and the rate in mol/L-s.

8. Which of the following thermodynamics statements is (are) correct? (AB) A closed system cannot exchange energy with the surroundings. (AC) The work done by a construction worker. weighing 60 kg, who climbs to the roof a 50-m tall building is about 29 kJ. (AD) Asystem at lower temperature has a greater intemal energy than the same system at a higher temperature. (AE) The internal energy of molecules is stored only as molecular potential energy. (BC) The total motional contribution to the molar internal energy of gascous H2O at 25℃is 7.43 kJ/mol. (BD) The equipartition theorem states that every degree of freedom that appears only quadratically in the total energy contributes R to the system's heat capacity.

複選題9. A particle trapped inside a one-dimensional box (AB) is likely to be found at one position than another in classical systems. (AC) cannot moves at any speed within the box in classical systems. (AD) only occupy certain energy levels if the box size is on the scale of a few nanometers. (AE) can have zero energy if the box size is on the scale of a few nanom meters. (BC) may never be detected at certain positions if the box size is on the scale of a few nanometers. (BD) resuits in four wavelengths equaling the size of the box for n=4. if the box size is on the scale of a few nanomcters.

複選題1.Regarding to the genetic material of bacteria and viruses, which statements is/are CORRECT? (A) Bacterial transformation provided the first evidence that DNA is the genetic material of bacteria. (B) The discovery of bacterial transformation was from the study of Streptococcus pneumonia of which the virulence is determined by its polysaccharide capsule. (C) Streptococcus preumonia without capsule (rough appearance) can kill mice by causing pneumonia. (D) The genetic material of viruses can be DNA or RNA. (E) RNA is the genetic material of some viruses that infect human.

複選題2.Regarding to the structure of DNA, which statements is/are CORRECT? (A) In the Watson-Crick model, two polynucleotide chains running in opposite directions, called antiparallel. (B) The two strands of DNA are wound around each other to form a regular A-form double helical structure. (C) Supercoiling can occur only if the DNA has no free ends. (D) Eukaryotic chromatin consists of nucleosome. A nucleosome contains DNA associated with a histone octamer. (E) Nucleosomal DNA is divided into core DNA and linker DNA. The core DNA has length approximately 200 bp.