課程名稱︰普化丙
課程性質︰必帶
課程教師︰鄭淑芬
開課學院：工學院
開課系所︰機械系
考試日期（年月日）︰2010/06/24
考試時限（分鐘）：120min
是否需發放獎勵金：是，謝謝
（如未明確表示，則不予發放）
試題 :
1.What is the molarity of a methylamine solution,CH3NH2(aq),that has the same
pH as 0.120M NH3(aq)？ (5%)
(Kb of CH3NH2= 4.2x10^(-4),Kb of NH3= 1.8x10^(-5))
2.Knowing standard reduction potentials
Pb(2+) +2e- ->Pb Eo=-0.13V;
Ni(2+) +2e- ->Ni Eo=-0.23V,
Determine the concentration of the ion in the following cells: (10%)
(a) Pb(s)/Pb(2+)(aq,?M)//Pb(2+)(aq,0.25M)/Pb(s) ε=0.050V
(b) Pb(s)/Pb(2+)(aq,?M)//Ni(2+)(aq,0.15M)/Ni(s) ε=0.040V
3.Knowing the following standard reduction potentials in an acidic solution
(pH=0)
0.564V 2.27V
MnO4(-) -> MnO4(2-) -> MnO2
(a) Write the balanced equations for these two reduction half reactions.(4%)
(b) What is the standard reduction potential of MnO4(-) -> MnO2 ? (4%)
(c) Is MnO4(2-) a stable species at pH=0？Explain. (2%)
4.Write formulas for the following coordination compounds, and indicate the
possible isomers if they have. (16%)
(a) diamminedichloroplatinum(II)
(b)tris(ethylenediamine)chromium(III) sulfate
(c)pentaaquaiodoiron(III) nitrate
(d)potassium dibromotetrafluoroferrate(II)
(e)sodium tetracyanozincate(II)
5.Draw the orbital energy-level diagram showing the configuration of
d-electrons on the metal ions in the following complexes.Also,indicate which
of them are paramagnetic. (16%)
(a) [NiCl4](2-) (tetrahedral)
(b) [Ni(CN)4](2-) (square planar)
(c) [CoF6](3-) (octahedral)
(d) [Ag(CN)2](-) (linear)
6.In solid corundum (Al2O3),Al(III) is surrounded by six oxide ions in an
octahedral configuration. Substitution of Cr(III) results in ruby. The Cr2O3
solid has the same structure as corundum,but is green. The unit cell in Al2O3
has lattice constants a=0.4763nm and c=1.3003nm;the unit cell in Cr2O3 has
lattice constants a=0.4960nm and c=1.3599nm.Explain the different colors of
Cr2O3 and ruby. (5%)
7.Name the following compounds. (12%)
(a) CH3CH2CH3
(b) CH3CH=CHCH2Ch3
(c) CH3CH=CHCH2CH=CHC2H5
(d) (e) (f)我不會畫...反正是
▕ ＼＿╱╲╱ 1,2-二甲基環己烷
╲╱╲╱ ／— (中間那是雙鍵)
▕ ╲
8.Draw the structural formulas of the following compounds. (10%)
(a) diethyl ether
(b) 1-pentanal
(c) 1,2-pentandiol
(d) butanoic acid
(e) methyl ethanoate
9.The pre-equilibrium and the stead-state approximations are two different
approaches to deriving a rate law from a proposed mechanism. For the following
mechanism,
k1
CH3OH + H(+) <=> CH3OH2(+) (fast in both directions)
k-1
k2
CH3OH2(+) +Br(-) -> CH3Br +H2O (slow)
determining the rate law by
(a) stead-state approximation,and (3%)
(b) pre-equilibrium approximation. (3%)
(c) Under what conditions do the two methods give the same answer? (2%)
(d) What will the rate law become at high concerntration of Br(-)? (2%)
10.The enzyme catalase catalyzes the decomposition of peroxide.The uncatalyzed
decomposition of peroxide has an activation energy of 82kJ/mol,and the
catalyzed reaction has an activation energy of 23kJ/mol.
(a) How much faster is the catalyzed reaction compared with the uncatalyzed
reaction at 298K? (4%)
(b) How much faster is the catalyzed reaction at 310K? (4%)
11. Write
(i) the structural formulas of the monomers of the following polymers,
(ii) indicate them to be the addition or condensation polymers,
(iii) identify the intermolecular force between chains of polymers,
(iv) indicate which of them has the functional feature to form a rubber,
(v) which of them can be a conducting polymer: (20%)
(a) polyethylene
(b)-(CH2C(CH3)=CHCH2)-
(c)
O O
∥ ∥
(—O—C—苯環—C—O—C—苯環—C—)n
(d)
O O
∥ ∥
(—C—苯環—C—NH—苯環—NH—)n
(e)
(—苯環—N
\\＿ (這些\\和//是指雙鍵)
/ \\
\\_/
\\
N—苯環—N—)n
(f)
(—五角形的碳鏈，全部單鍵—C=C—)n
Useful informations:
F=96500C
gas constant,R=8.314 J/(molxK)
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