課程名稱︰普通化學丙
課程性質︰分班編組課程
課程教師︰黃俊誠
開課學院：園藝
開課系所︰
考試日期（年月日）︰96.4.24
考試時限（分鐘）：兩節課
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
1. Nomenclature
I. Name each of following compounds:(a)Mg3(PO4)2 (b)LiOCl2 (c)ICl
II. Write the formula for each of following compounds:
(a)Sodium peroxide (b) Nitrous acid (c) Calcium sulfite
2. For each of following molecules or ions, (I) writing the Lewis structure(s)
that obey the octect rule, (II) predicy the molecular structure, (III)
giving the expected hybrid orbitals on the central atom, (IV) giving the
formal charge on the central atom.
(a) XeO4 (b)I3- (c) SO2
3. (a) Describe the molecule ClO2, using three possible resonance structure
(b) Do any if these resonance structures satisfy the octext rule for every
atom in the molecule? Why or why not?
(c) Using formal charges, select the resonance structures that is(are) most
important.
4. Many biochemical reactions are catalyzed by large protein molecules called
enzymes. A typical mechanism for the conversion of a biochemical
substrate(S) to product(P) catalyzedf by an enzyme(E) involves the
following steps:
k1
----->
E + S ES
<-----
k-1
k2
ES------> P
The rate-determiningstep is the decomposition of the intermediate
enzyme-substrate complex(ES) to products(P). Under these conditions, show
that the overall rate of product formation is:
d[P] (k1)(k2)([E]t)[S]
Rate= ---- = -------------------- where [E]t equals tje total enzyme
dt (k-1)+(k2)+(k1)[S]
comcentration: [E]t=[E]+[ES]
5. The decomposition of NH3 to N2 and H2 was studied on two surfaces.
Surfave Ea(kJ/mol)
------------------------------
W 163
Os 197
without a catalyst the activation energy is 335 kJ/mol.
(a) Which surface is the better heterogeneous catalyst for the decomposition
of NH3? Explain.
(b) How many times faster is the reacton at 300K in the W surface compared
with the reaction with no catalyst present?
(c) The decomposition reactionon the two surfaces obeys a rate law of the
form
[NH3]
Rate=k------
[H2]
How can you explain the inverse dependence of the rate on the H2
concentration?
6. The reaction PCl3(g)+Cl2(g) <-----> PCl5(g) has Kp=0.0870 at 攝氏300度. A
flask is charged with 0.50atm PCl3,0.5atm Cl2,and 0.20 PCl5 at this
temperature. (a)_ Use the reaction quotient to determine the direction
the reaction must proceed in order to reach equilibrium.
(b) Calculate the equilibrium partial pressures of the gas.
(c) What effect will increasing the volume of the system have on the mole
fraction of Cl2 in the equilibrium mixture?
(d) The reaction is exothermic. What effect will increasing the temperature
of the system have on the mole fraction of Cl2 in the equilibrium
mixture?
7. Calculate the average energies of F2 and Ar molechles (ideal gas) at 1000K.
8. Using the moleculat orbital model, write electron configurations for the
following diatomic species and calculate the bond orders. Which ones are
paramagnetic? Which ones are diamagnetic? Place the species in order of
increasing bond length and bond energy.
a.NO+ b. NO c. NO-
9. The reaction 2NO2---->2NO+ O2 has the rate constant=0.63 M-1 S-1 . Based
on the units for k, is the reaction zero, first or second order in NO2?
If initial concentration of NO2 is 0.100 M, how would you determine how
long it would take for the concentration to decrease to 0.025M?
10.Calculate (I) the impact rate and (II)the collision frequency on a 5.00-cm2
section of a vessel containing oxygengas at a pressure of 3.00atm and 127度C.
Assume that the diameter of an O2 molecule is 300 pm.
11. LiI(s) has a heat of formation of -272kJ/mol and a lattice energy of
-753kJ/mol. The ionization energy of Li(g) is 520kJ/mol, the bond energy
of I2(g) is 151kJ/mol, and the electron affinity of I(g) is -295kJ/mol.
Use these data to determine the heat of sublimation of Li(s).
12. Write the electron configuration for (a) Mn2+ ion and (b) the Si2+ ion.
How many unpaired electrons does each contain?
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