國立彰化師範大學 99 學年度第二學期學士班轉學生招生考試試題
學系： 化學系
年級： 二 年級
科目： 普通化學
☆☆請在答案紙上作答☆☆
第 1 頁，共 4 頁
I. Multiple choice questions (choose only one answer) ［50%］
1. Which one has maximum significant figure in the following number?
(A) 0.0048
(B) 0.00480
(C) 4.80×10-2
(D) 4.8000×10-2.
2. The mineral pyrolusite is a compound of manganese-55 and oxygen-16. If 63% of the mass of
pyrolusite is due to manganese, the empirical formula of pyrolusite is
(A) MnO
(B) Mn2O
(C) Mn2O2
(D) MnO2.
3. Which one of these ions has the largest radius?
(A) Cl−
(B) K+
(C) S2−
(D) O2−.
4. Which element will display an unusually large jump in ionization energy values between I3 and
I4, its third and fourth ionization energies?
(A) Na
(B) Mg
(C) Al
(D) Si.
5. A mass spectrometer works by ionizing atoms or molecules, and then accelerating them past
oppositely charged plates. The mass is obtained by
(A) measuring the force of impact on a detecting screen, and then calculating the mass using
force = mass × acceleration.
(B) suspending the ions in an applied electric field, and then calculating mass by the setting the
downward gravitational force equal to the upward electrostatic force.
(C) measuring the magnitude of deflection as the ions pass through a magnetic field to obtain
the charge-to-mass ratio, and then calculating the mass from that ratio.
(D) measuring the time it takes for the ions to hit the detector at a known distance to calculate
the acceleration, and then calculating mass from force = mass× acceleration.
6. Which of the following compounds is a strong electrolyte?
(A) H2O
(B) CH3OH
(C) HF
(D) NaF.
7. Based on the solubility rules, which of the following will occur when a solution containing
about 0.1 g of Pb(NO3)2(aq) is mixed with a solution containing 0.1 g of KI(aq) /100 mL?
(A) KNO3 will precipitate; Pb2+ and I– are spectator ions.
(B) Pb2+ and I– are spectator ions, and PbI2 will precipitate.
(C) Pb(NO3)2 will precipitate; K+ and I– are spectator ions.
(D) PbI2 will precipitate; K+ and NO3– are spectator ions.
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國立彰化師範大學 99 學年度第二學期學士班轉學生招生考試試題
學系： 化學系
年級： 二 年級
科目： 普通化學
☆☆請在答案紙上作答☆☆
8. Which of the following species has a trigonal bipyramid structure?
(A) NH3
(B) IF5
(C) I3–
(D) PCl5.
第 2 頁，共 4 頁
9. The hybridization of Se in SeF6 is
(A) sp2
(B) sp3
(C) dsp3
(D) d2sp3.
10. The solubility of gases in water usually decreases with
(A) increasing pressure. (B) decreasing pressure.
(C) increasing temperature. (D) decreasing temperature.
11. The reaction 3NO Æ N2O + NO2 is found to obey the rate law, Rate = k[NO]2. If the first
half-life of the reaction is found to be 2.0 s, what is the length of the fourth half-life?
(A) 2.0 s
(B) 4.0 s
(C) 8.0 s
(D) 12.0 s
(E) 16.0 s
12. The reaction quotient for a system is 7.2 × 102. If the equilibrium constant for the system is 36,
what will happen as equilibrium is approached?
(A)
(C)
(D)
(E)
There will be a net gain in product.
(B) There will be a net gain in reactant.
There will be a net gain in both product and reactant.
There will be no net gain in either product or reactant.
The equilibrium constant will decrease until it equals the reaction quotient.
13. Using the following Ka values, indicate the correct order of base strength.
HNO2
(A)
(C)
(E)
Ka = 4.0 × 10–4;
HF Ka = 7.2 × 10–4;
HCN Ka = 6.2 × 10–10
(B) Cl– > H2O > F– > NO2– > CN–
CN– > NO2– > F– > H2O > Cl–
CN– > F– > NO2– > Cl– > H2O
(D) H2O > CN– > NO2– > F– > Cl–
none of these
14. Consider a 0.70 M solution of HOCl. If the molarity was decreased to 0.3 M, which of the
following statements would be true?
(A)The percent dissociation would not change.(B)The percent dissociation would increase.
(C)The percent dissociation would decrease. (D)The equilibrium constant would stay the same.
(E)
Two of these.
15. For which of the following processes would ΔS° be expected to be most positive?
(A)
O2(g) + 2H2(g) Æ
(C)
NH3(g) + HCl(g) Æ
(D)
2NH4NO3(s) Æ
(B) H2O(l) Æ H2O(s)
2H2O(g)
NH4Cl(g)
2N2(g) + O2(g) + 4H2O(g)
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(E) N2O4(g) Æ 2NO2(g)
國立彰化師範大學 99 學年度第二學期學士班轉學生招生考試試題
學系： 化學系
年級： 二 年級
科目： 普通化學
☆☆請在答案紙上作答☆☆
第 3 頁，共 4 頁
16. Which of the following statements is true about the octahedral complexes of Ni2+?
(A)
Both strong- and weak-field complexes are diamagnetic.
(B)
The strong-field complex is diamagnetic and the weak-field complex is paramagnetic.
(C)
The strong-field complex is paramagnetic and the weak-field complex is diamagnetic.
(D)
Both strong- and weak-field complexes are paramagnetic.
(E)
There are no octahedral complexes of Ni.
17. The spectrochemical series is I– < Br– < Cl– < F– < OH– < H2O < NH3 < en < NO2– < CN–.
Which of the following complexes will absorb visible radiation of the highest energy (shortest
wavelength)?
(A)
[Co(H2O)6]3+
(B)
[Co(I)6]3–
(C) [Co(OH)6]3–
(D)
[Co(en)3]3+
(E)
[Co(NH3)6]3+
18. Which of the following polymers is not based on a substituted ethylene monomer?
(A)
nylon
(B) polyvinylchloride (C) Teflon
(D)
polystyrene
(E)
polypropylene
19. Which of the following has the smallest molar mass?
(A)
mRNA
(B)
dRNA
(C) rRNA
(D)
sRNA
(E)
tRNA
20. Which of the following solutions will be the best buffer at a pH of 9.26? (Ka for HC2H3O2 is 1.8
× 10-5, Kb for NH3 is 1.8 × 10-5).
(A) 0.10 M HC2H3O2 and 0.10 M NaC2H3O2
(B) 5.0 M HC2H3O2 and 5.0 M NaC2H3O2
(C) 0.10 M NH3 and 0.10 M NH4Cl
(D) 5.0 M NH3 and 5.0 M NH4Cl
(E) 5.0 M HC2H3O2 and 5.0 M NH3
II. Answer the following questions ［50%］
Note : (1) Must show detailed calculation processes in your answer.
(2) The calculation results might be ignored if calculator is prohibited.
1. Use the following data to estimate ΔHformation0 for magnesium fluoride.［5%］
Mg (s) + F2 (g) → MgF2 (s)
Lattice energy: -2913 kJ/mol, IE1 (Mg): 735 kJ/mol, IE2 (Mg): 1445 kJ/mol, ΔHsublimation0 (Mg):
150 kJ/mol, EA (F): -328 kJ/mol, Bond energy (F2): 154 kJ/mol
2. (a) Draw a molecular orbital diagram for O2 and N2, respectively. ［4%］
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國立彰化師範大學 99 學年度第二學期學士班轉學生招生考試試題
學系： 化學系
年級： 二 年級
科目： 普通化學
☆☆請在答案紙上作答☆☆
第 4 頁，共 4 頁
(b) Using molecular orbital theory, explain why the removal of one electron in O2 strengthens
bonding, while the removal of one electron in N2 weakens bonding. ［2%］
3. Potassium chromate, a bright yellow solid, is produced by the reaction of solid chromite ore
(FeCr2O4) with solid potassium carbonate and gaseous oxygen at high temperatures. The other
products of the reaction are solid iron(III) oxide and gaseous carbon dioxide. In a particular
experiment 169 kg of chromite ore, 298 kg of potassium carbonate, and 75.0 kg of oxygen were
sealed in a reaction vessel and reacted at a high temperature. The amount of potassium
chromate obtained was 194 kg. Calculate the percent yield of potassium chromate. (MWFeCr2O4:
223.84 g/mol, MWK2CO3: 138.21 g/mol, MWO2: 32.00 g/mol, MWK2CrO4: 194.19 g/mol) ［6%］
4. A quantity of 0.02 mole of a gas initially at 0.05 L and 20°C undergoes a constant-temperature
expansion until it’s volume is 0.5 L. Calculate the work done (in joules) by the gas if it expands
(a) against a vacuum and (b) against a constant pressure of 0.2 atm. (c) If the gas in (b) is
allowed to expand unchecked until its pressure is equal to the external pressure, what would its
final volume be before it stopped expanding, and what would be the work done? ［8%］
5. Calculate the final concentrations of C2O42–(aq), Ba2+(aq), and Br–(aq) in a solution prepared
by adding 0.100 L of 0.200 M K2C2O4 to 0.150 L of 0.250 M BaBr2. (For BaC2O4, Ksp = 2.3 ×
10-8) ［7%］
6. Draw all the structural and geometrical isomers of C3H5Cl. ［10%］
7. The table below lists the cell potentials for the 10 possible galvanic cells assembled from the
metals A, B, C, D and E, and their respective 1.00 M ions in solution. Using the data in the table,
please calculate the standard reduction potential for each ion (B2+, C2+, D2+ and E2+). It is
known that the standard reduction potential for A2+ ion is 0.00 V, and metal D(s) comes out of
solution when metal C(s) is added to a solution with D2+(aq). ［8%］
A(s) in A2+(aq)
B(s) in B2+(aq)
C(s) in C2+(aq)
D(s) in D2+(aq)
E(s) in E2+(aq)
0.28 V
0.81 V
0.13 V
1.00 V
D(s) in D2+(aq)
1.13 V
0.72 V
0.19 V
2+
0.41 V
0.94 V
2+
0.53 V
C(s) in C (aq)
B(s) in B (aq)
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