I. Choose one correct answer for the following questions
【單選題】每題 1 分，共計 60 分，答錯一題倒扣 0.25 分，倒扣至本大題零分為止，未作答，不給分不扣分。
1.
(A) 1.00-2(0.123) (B) 8.13 (C) 0.123 (D) 66.1 (E) 16.3
2. Consider the following rate law: Rate =
k
[A]n[B]m. How are the exponents n and m determined?(A) By using the balanced chemical equation
(B) By using the subscripts for the chemical formulas
(C) By using the coefficients of the chemical formulas (D) By educated guess
(E) By experiment
3. How many oxygen atoms are there in one formula unit of Ca3(PO4)2?
(A) 2 (B) 4 (C) 6 (D) 8 (E) none of these
4. An unknown substance dissolves readily in water but not in benzene (a nonpolar solvent). Molecules of what type are present in the substance?
(A) neither polar nor nonpolar (B) polar (C) either polar or nonpolar (D) nonpolar (E) none of these
5. Which of the species below, when dissolved in H2O, will not produce a basic solution?
(A) SO2 (B) NH3 (C) BaO (D) Ba(OH)2 (E) none of these
6. Consider the reaction:
The equilibrium constant for the reaction as written is .
(A) K=[CaCl2·2H2]/([CaCl2][H2O]2) (B) K=1/[H2O]2 (C) K=1/2[H2O]
(D) K=[H2O]2 (E) K=[CaCl2·2H2O]/[H2O]2
7. Which of the following concentration measures will change in value as the temperature of a solution changes?
(A) mass percent (B) mole fraction (C) molality (D) molarity (E) all of these 8. A solution containing 296.6g of Mg(NO3)2 per liter has a density of 1.114 g/mL. The molarity of the solution is:
(Mg(NO3)2:148.3 g/mol).
(A) 2.000 M (B) 2.446 M (C) 6.001 M (D) 1.805 M (E) none of these 9. Calculate the molality of C2H5OH in a water solution that is prepared by mixing 50.0 mL of C2H5OH with 100.0 mL of H2O
at 20℃. The density of the C2H5OH is 0.789 g/mL at 20℃. (C2H5OH: 46.07 g/mol. Density of H2O is 1 g/cm3).
(A) 0.086 m (B) 0.094 m (C) 1.24 m (D) 8.56 m (E) none of these 10. Which statement about N2 is false?
(A) It is a gas at room temperature.
(B) The oxidation state is +3 on one N and -3 on the other.
(C) It has one sigma and two pi bonds between the two atoms.
(D) It can combine with H2 to form NH3. (E) It has two pairs of nonbonding electrons.
CaCl2(s)+2H2O(g) CaCl2 2H2O(s)
If the equilibrium constant for A + B C is 0.123, then the equilibrium constant for 2C 2A + 2B is .
11. Which of these statements about benzene is true?
(A) All carbon atoms in benzene are sp3 hybridized.
(B) Benzene contains only πbonds between C atoms.
(C) The bond order of each C—C bond in benzene is 1.5.
(D) Benzene is an example of a molecule that displays ionic bonding.
(E) All of these statements are false.
12. When electrons in a molecule are not found between a pair of atoms but move throughout the molecule, this is called .
(A) ionic bonding (B) covalent bonding
(C) polar covalent bonding (D) delocalization of the electrons (E) a dipole moment
13. Which one of the following descriptions for microelectrodes is incorrect?
(A) The dimensions of such electrodes are usually smaller than about 20 μm.
(B) The IR (current × resistance) drop of microelectrodes is higher than traditional electrodes.
(C) Such electrodes can be used for the study of chemical processes in single cells.
(D) They are also called ultramicroelectrodes or microscopic electrodes.
(E) By using such electrodes, three electrodes system is not necessary.
14. Which one of the following descriptions about GC (gas chromatography) is correct?
(A) In GC, the stationary phase is liquid or solid, the mobile phase is gas.
(B) It can only be applied for gaseous samples.
(C) In order to obtain a complete separation, different gaseous mixtures are purged into the column successively.
(D) GC is not an efficient separation technique.
(E) All of these are correct.
15. Which one of the following detectors is not used for HPLC (high-performance liquid chromatography)?
(A) Absorbance detectors (B) Fluorescence detectors (C) Electrochemical detectors (D) Flame ionization detectors (E) Mass spectrometers
16. Which one of the following descriptions about CE (capillary electrophoresis) is incorrect?
(A) Electrophoresis is a separation technique based on the different migration rates of charged species.
(B) It cannot be used to separate proteins and nucleic acids.
(C) Its particular strength is the unique ability to separate charged macromolecules.
(D) Until the appearance of CE, electrophoretic separations were not carried out in columns.
(E) Most of the detectors used for HPLC can be employed for CE.
17. The pH meter is widely used for measuring the H+ concentrations in the solutions. Which one of the following descriptions for a pH is incorrect?
(A) The sensing material is a special thin glass membrane at the tip of the electrode.
(B) No reference electrode is required for a pH meter.
(C) The real signal obtained from the pH meter is voltage (or difference of potentials).
(D) In basic solutions, the indicator electrode also responds to alkali metal ions.
(E) pH meters can be used to determine the equivalence point of the acid-base titration.
18. Atomic spectrometer is widely applied for the analysis of various elements. Which one of the following is not an atomization method used for most atomic spectrometer?
(A) Flame (B) Inductively coupled plasma (C) Electrothermal oven (D) Laser (E) Electric spark
19. A method of separation that employs a system with two phases of matter, a mobile phase and a stationary phase, is called .
(A) filtration (B) chromatography (C) distillation (D) vaporization (E) homogenization 20. A solution is also called a .
(A) homogeneous mixture (B) heterogeneous mixture (C) pure mixture
(D) compound (E) distilled mixture
21. Which one of the following descriptions for the Beer’s law is incorrect?
(A) Beer’s law is ordinarily represented as A =εbs.
(B) For a mixture, the total absorbance at a λ=the sum of individual absorbance if there is no intermolecular interaction.
(C) Beer’s law is more suitable for concentrated solutions.
(D) Negative deviations are always observed if polychromic radiations are used.
(E) The b term in the equation of item (a) means the optical length.
22. Buffer solutions are very important for many analytical applications. Which one of the following descriptions about buffer solutions is incorrect?
(A) Buffer solutions are generally from conjugate acid/base pairs.
(B) Buffer solutions can resist to changes of pH when the solutions are diluted or added with strong acids or bases.
(C) The buffer capacity is the measurement of ability that resists to pH changes.
(D) The buffer capacity of a solution is determined by the strength of the conjugate acid/base pair.
(E) The pH of a buffer solution can be determined by pH=pKa + log ([base]/[acid]).
23. Which one of the following apparatuses is not used for measurement of volume?
(A) Volumetric (B) Pipet (C) Buret
(D) Test tube (E) All of these are used for measurement of volume.
24. What is the major product of the following reaction?
(A) (B) (C) (D) (E) None of the above
25. Which one of the following molecular formulae can represent a pair of mirror image isomers?
(A) H2NCH2COOH (B) H2NCH(CH3)COOH (E) involves a reaction in which the propagation steps also produce the product and initiator necessary for another
propagation cycle
27. Which statement best describes 1,3-butadiene?
(A) 1,3-butadiene is less stable than 1,4-pentadiene due to steric crowding.
(B) 1,3-butadiene is more stable than 1,4-pentadiene because of less steric crowding.
(C) 1,3-butadiene is less stable than two molecules of 1-butene.
(D) 1,3-butadiene is more stable than 1,4-pentadiene due to resonance energy.
(E) 1,3-butadiene’s carbon atoms are sp3 hybridized.
28. Which is the general formula for cyclic hydrocarbons with one double covalent bond between adjacent atoms?
(A) CnH2n+2 (B) CnH2n (C) CnH2n-2 (D) CnH2n-4 (E) CnH2n-6 29. What is the major product of the following reaction?
(A) (S) 2-butanol (B) (R)2-butanol (C) racemic mixture of 2-butanol (D) e.e of (S)-butanol (E) diastereomeric mixture of 2-butanol
30. How many absorptions will the following compound have in its carbon NMR spectrum?
(A) 3 (B) 4 (C) 5 (D) 6 (E) 7
31. The pinacol rearrangement proceeds via intermediate.
(A) carbanion (B) carbocation (C) radical (D) lone pair (E) neutral 32. Rank the following compounds with respect to increasing acidity (least acidic to most acidic).
(A) 3<1<2<5<5 (B) 4<3<1<2<5 (C) 4<3<1<2<5 (D) 5<2<1<3<4 (E) 4<5<2<1<3 33. What is the product of the following reaction:
(A) (B) (C) (D) All of the above (E) Pentane
34. What is the stereochemistry of the following compound:
(A) R-form (B) S-form (C) not chiral (D) meso compound (E) racemic mixture 35. What is the name of the compound whose line drawing is shown below?
(A) 3-ethyl-4-methyl-2-hexanol (B) 4-ethyl-3-methyl-5-hexanol (C) 3,4-diethyl-2-pentanol (D) 2,3-diethyl-4-pentanol (E) 3-iso-buty1-2-pentanol
36. Which of the following statements is correct?
(A) Alkenes have only sp2hybridised carbon atoms.
(B) Alkenes will react with ozone to give carbonyl compounds.
(C) Amines can react with carboxylic acids to give esters.
(D) Tertiary alcohols will oxidise to ketones.
(E) Bromobenzene will undergo an SN2 substitution reaction
37. Which of the following alkyl bromides will undergo the SN2 reaction the fastest?
(A) Bromobenzene (B) Butyl bromide (C) tert-Butyl bromide (D) iso-butyl bromide (E) 1-Bromo-4-nitrobenzene
38. What is the normality of a solution containing 49g of of H3PO4 in 2,000 mL, of solution?
(A) 0.25 N (B) 0.50 N (C) 0.75 N (D) 1.00 N (E) 1.50 N
(A) weaker, weaker (B) stronger, stronger (C) weaker, stronger
(D) stronger, weaker (E) cannot be predicted
40. Determine the empirical formula of polystyrene which is 92.3% C and 7.7% H. (Atomic weights: C = 12.01, H = 1.008).
(A) CH3 (B) CH2 (C) C2H (D) C2H3 (E) CH
41. Give the intermediate that is formed in the ozonolysis reaction of (E)-2-butene.
(A) (B) (C) (D) (E)