課程名稱︰普通化學丙
課程性質︰大一上期末考
課程教師︰陳志賢
開課學院：生農學院
開課系所︰昆蟲,動科,農藝
考試日期（年月日）︰99.01.15
考試時限（分鐘）：120 分鐘
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
total:100points
Section1.
(for each question, to obtain 4 points for Correct answer;0 point for
No answer, -1 point for Incorrect answer)
1.Which statement of groups 1A and 2A elements is wrong?
a.Hydrogen gas can be obtaind by recation of methane with water.
b.Calcium hydride can be a dehydration agent.
c.'Soft water' means the appearance of sodium and potassium ions in water.
d.Magnesium is more reactive with H2O than calcium.
2.Which statement of compounds containing nitrogen element is correct?
a.Trinitrotoluene is a well-know explosive compound beacause of highly
endothermic rections and releasing large amount of gas.
b.Hydrazine is a strong reducing agent.
c.Nitrous oxide is a paramagnetic compound.
d.Nitirc oxide shows reddish brown color.
3.Which statement is wrong?
a.White phosphorus is more reactive than red phosphorus.
b.P2O5 denotes phosphorus pentoxide.
c.H3PO4 denotes phosphorous acid.
d.H3PO4 is a triprotic acid.
4.Which statement of group 6A element is wrong?
a.The boiling point of O2 is higher than N2
b.Sulfur atoms are usually formed S-S single bond, not S=S double bond.
c.SO2 is more stable than SO.
b.Sulfurous acid is a strong dehydrating agent.
5.The acid strength of hydrogen halides is HI>HBr>HCl>HF. The key reason is:
a.HI has the lowest bond energy.
b.HF has the most negative hydration energy.
c.I- ion has less negative entropy of hydration.
d.HI has the largest molecular size.
6.Wich statement of titanium element and corresponding derivatives is wrong?
a.The usual oxidation state of titanium is 4+.
b.Titanium dioxide can be an UV protector.
c.Metal titanium is hard to be oxidized and it can be a good material to
resist corrosion of iron.
d.Titanium chloride can react with H2O to form titanium dioxide.
7.Which statement of chromium element and corresponding derivatives is
correct?
a.Dichromate ion is a relatively weak oxidizing agent.
b.Chromate ion is a relatively strong oxidizing agent.
c.Dichromate ion can form strong oxidizing agent with hydrochloric acid,
named cleaning solution.
d.Chromous ion is a powerful reducing agent.
8.Which statement of coordination compounds is correct?
a.Involving complexx ion and counter ion.
b.Metals serve as lewis base, and ligands serve as lewis acid.
c.Always form tetrahedral structure.
d.EDTA is usually a bidentate ligand.
9.Which one is a pair of enantiomer?
picturs can not show here.sorry
10.There are three tubes containing different chromium complex ion,Cr(NH3)6 3+
,Cr(H2O)6 3+, and Cr(H2O)4Cl2 + . The 1st tube is violet color.The 2nd tube
is yellow color, The 3rd tube is green.Which one is the correct identify
of the complex ion in each tube?
a.1st:Cr(H2O)6 3+ ,2nd:Cr(NH3)6 3+ ,3rd:Cr(H2O)4Cl2 +
b.1st:Cr(NH3)6 3+ ,2nd:Cr(H2O)4Cl2 + ,3rd:Cr(H2O)6 3+
c.1st:Cr(H2O)6 3+ ,2nd:Cr(H2O)4Cl2 + ,3rd:Cr(NH3)6 3+
d.1st:Cr(H2O)4Cl2 + ,2nd:Cr(NH3)6 3+ ,3rd:Cr(H2O)6 3+
11.Which statement is right?
a.The Beer's Law is always right with any concentration of solutions.
b.When the concentration of solution is increased, the absorbance would be
decreased.
c.When the path length of radiation is increased , the extinction coefficient
would be larger.
d.None of above.
12.What is the meaning of isosbestic point?
a.To identify the chemical structure of species.
b.To identify the relation between concentration and absorbance.
c.To identify sensitivity of absorption spectra.
d.To identify the numbers of species in solution.
13.What is the main factor that resulted in the observation of stokes shift?
a.Internal conversion between different electronic excited states.
b.Intersystem crossing between singlet and triplet excited states.
c.Vibrational relaxation in excited and ground states.
d.Thermal deactivation between excited and ground states.
14.Which statement is wrong ?
a.The quantum yield of compound might be increased when the viscosity of
solvent was lower.
b.The quantum yield of compound might be decreased whan the temperature of
solvent was increased.
c.The quantum yield of compound might be enhanced with more rigid structure.
d.The quantum yield of compound might be reduced when the concentration of
solution was higher.
15.Compare the quantum yield of benzene derivatives with different
substituents.Which sequence is correct?
a.苯環+NO2 > 苯環+OCH3 > 苯環+H > 苯環+Cl
b.苯環+H > 苯環+OCH3 > 苯環+Cl > 苯環+NO2
c.苯環+OCH3 > 苯環+H > 苯環+Cl > 苯環+NO2
d.苯環+H > 苯環+OCH3 > 苯環+NO2 > 苯環+Cl
Sction2.
16.Please draw the molecular orbital energy-level diagram of CoF6 3+ whith
yields a high-spin case(including orbitals and electrons of free metal ion
, orbitals and electrons of ligand lone pair, and the molecular orbitals
and electrons of the complex ion. Point out the structure of this complex
, and assign the denotations of complex ion d orditals and the belonging
sets.)
(10 points)
17.Please draw the energy diagram for a photoluminescence system including
transitions between ground and excites states, and between defferent
excited states.(Hint:point out at least six kinds of transiton processes.)
(12 points)
18.2-naphthol (1.44 mg) was dissolved in tetrahydrofuran (1.0 L), and the
absorbance at absorption maximum (wavelengt max=330nm)was 0.20.The quantum
yield of Coumarin-1 is 0.99 in tetrahydrofuran, and this reference
compound was utilized to estimate the quantum yield of 2-naphthol in which
the quantum yield was considered to be similar with naphthalene. At 340nm
wavelength, both of naphthalene and reference compound have the same
absorbance of 0.19, and the corresponding emission spectra(excitation at
340nm )of thesis two compounds show integral intensities to be 800 for
2-naphthol and 2400 for coumarin-1. Besides, the rate of fluorescence for
naphthalene was measured to be 1*10^-7 s^-1 . 4-(dimethylamino) benzoic
acid was added into the solution, and the esterification reaction took
place as shown in Scheme 1. The absorbance of 2-naphthol at 330nm
decreased with reaction time. The results are shown in Table 1.Finally, the
quantum yield of the naphthalene moiety was measured to be 0.1 . It seems
likely that electron transfer occurred in the final product.
(18.points)
Scheme1.
2-naphthol + 4-(dimenthylamino)benzoic acid ->final product
(I'm sorry that the chemical diagram can not show here )
Table1.
-------------------------------------------------------------------------
Time(min) Absorbance at 330nm
-------------------------------------------------------------------------
0 0.2
1 0.1 5
2 0.1
3 0.05
--------------------------------------------------------------------------
a.To estimate the extinction coefficient of 2-naphthod (the specimen is 1.0cm)
b.To estimate the quantum yield of 2-naphthol.
c.To determine the rate constant of esterification reaction.
d.To obtain the rate of electron transfer.
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