[轉錄][試題] 98上 黃信炅 普通化學丙 期末考
※ [本文轉錄自 NTU-Exam 看板 #1BK1i604 ]
作者: cary0415chen (阿祥) 看板: NTU-Exam
標題: [試題] 98上 普通化學丙 黃信炅
時間: Fri Jan 15 15:36:33 2010
課程名稱︰普通化學丙
課程性質︰必修
課程教師︰黃信炅
開課學院:醫學院 公衛學院
開課系所︰醫技護理公衛
考試日期(年月日)︰2010 1 15
考試時限(分鐘):120
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試題 :
1.Consider the molecular orbital energy level diagrams for O2 and
NO. Which of the following is true?(2pts)
I. Both moleculus are paramagnetic.
II. The bond strength of O2 is greater than the bond
strength of NO.
III.NO is an example of a mononuclear diatomic molecule.
IV. The ionization energy of NO is smaller than the ionization
energy of NO^+
a) I only
b) I and II
c) I and IV
d) II and III
e) I,II, and IV
2.Which of the following has the greatest bond strength?(2pts)
a)B2
b)O2^-
c)CN^-
d)O2^+
e)NO^-
3.Draw a molecular orbital diagram for O2 and N2. Using molecular
orbital theory, explain why the removal of one electron in O2
strength bonding, while the removal of one electron in N2 weakens
bonding.(6pts)
4.Silver crystallizes in a cubic closesr packed structure. The radius
of silver atom is 144pm. Calculate the density of solid silver.
5.A metal crystallizes in a body-centered unit cell with an edge length
of 2.00*10^2 pm. Assime the atoms in the cell touch along the cube
diagonal. The percentage of empty volume in the unit cell will be:(3pts)
a) 0%
b) 26.0%
c) 32.0%
d) 68.0%
e) none of these
6.Carbon tetrachloride, CCl4, has a vapor pressure of 213 torr at 40℃
and 836torr at 80℃. What is the normal boiling point of CCl4?(3pts)
7.The vapor pressure of water at 25.0℃ is 23.8torr. Determine the mass
of glucose(molar mass=180g/mol) needed to add to 500.0g of water to
change the vapor pressure to 23.3torr.(3pts)
8.At a given temperature, you have a mixture of benzene(vapor pressure
of pure benzene=745torr) and toluene(vapor pressure of pure toluene=
290torr). The mole fraction of benzene in the vapor above the solution
is 0.590. Assuming ideal behavior, caculate the mole fraction of toluene
in the solution.(3pts)
a) 0.213
b) 0.778
c) 0.641
d) 0.359
e) 0.590
9.The solubility of nitrogen in water is 8.21*10^-4 mol/L at 0℃ when
the N2 pressure above water is 0.790atm. Calculate the Henry's law
constant of N2 in units of mol/(L*atm) for Henry's law in the form
C=kP, where C is the gas concentration in mol/L. Calculate the solubility
of N2 in water when the partial pressure of nitrogen above water is
1.10atm at 0℃.(4pts)
10.For a reaction: aA→products, [A]0=6.0M, and the first two half-lives
are 56 and 28 minutes, respectively. Calculate [A] at t=99.1 minutes.
(4pts)
a) 5.3M
b) 11M
c) 1.04M
d) 0.69M
e) none of them
11.The rate of the reaction
O+NO2→NO+O2
was studied at a certain temperature.
a.In the first set of experiments NO2 was in large excess, at a concentration
of 1.0*10^13 molecules/cm^3 with the following data collected.
Time(s) [O](atoms/cm^3)
0 5.0*10^9
1.0*10^-2 1.9*10^9
2.0*10^-2 6.8*10^8
3.0*10^-2 2.5*10^8
What is the order of the reaction with respect to oxygen atoms?(3pts)
b.The reaction is known to be first order with respect to NO2. Determine
the overall rate law and the value of the rate constant.(3pts)
12.The kinetics of the reaction A+3B→C+2D were studied and the following
result obtained, where the rate law is:
Δ[A]
-──── = k[A]^n * [B]^m
Δt
For a run where [A]0=1.0*10^-3M and [B]0=5.0M, a plot of ln[A] versus
t was found to give a straight line with slope=-5.0*10^-2 s^-1.
For a run where [A]0=1.0*10^-3M and [B]0=10.M, a plot of ln[A] versus
t was found to give a straight line with slope=-7.1*10^-2 s^-1.
(i) What is the value of n?(2pts)
a) 0
b) 0.5
c) 1
d) 1.5
e) 2
(ii) What is the value of m?(2pts)
a) 0
b) 0.5
c) 1
d) 1.5
e) 2
(iii) Calculate the value of k(ignore units).(2pts)
a) 22
b) 10
c) 50
d) 1.1
e) none of these
13.Consider the following system at equilibrium: N2+3H2→2NH3+92.94KJ
Which of the following changes will shift the equilibrium to the right?
(4pts)
I. increasing the temperature
II. decreasing the temperature
III.increasing the volume
IV. decreasing the volume
V. removing some NH3
VI. adding some NH3
VII.removing some N2
VIIIadding some N2
14.At 35℃, K=1.6*10^-1 for the reaction
2NOCl→2NO+Cl2
Calculate the concentrations of all species at equilibrum for each
of the following original mixtyres.
a. 2.0mol pure NOCl in a 2.0L flask.(2pts)
b. 1.0mol NOCl and 1.0mol NO in a 1.0L flask.(2pts)
15.Aspartic acid(C4H7NO4), one of the 20 essential amino acid, has two
ionizable hydrogens. At 25℃, Ka1=1.38*10^-4 and Ka2=1.51*10^-10
What is the concentration of doubly ionized aspartate ions in a 0.125M
aqueous solution of aspartic acid?(3pts)
16.Hydrogen cyanide gas (HCN), a powerful respiratory inhibitor, is highly
toxic. It is a very weal acid(Ka=6.2*10^-10) when dissolves in water.
If a 50.0mL sample of 0.100M HCN is titrated with with 0.100 NaOH,
calculate the pH of the solution.
a.after 8.00mL of 0.100M NaOH has been added.
b.at the halfway point of the titration.(2pts)
c.at the equivalence point of the titration.(2pts)
17.Consider a solution made by mixing 500.0mL of 4.0M NH3 and 500.0mL of
AgNO3. Ag+reactwith NH3 to form AgNH3+ and Ag(NH3)2^+:
Ag+ + NH3→AgNH3+ K1=2.1*10^3
AgNH3+ + NH3→Ag(NH3)+ K2=8.2*10^3
(i) The concentration of Ag(NH3)2+ at equilibrium.(2pts)
(ii)The concentration of Ag+ at equilibrium.(2pts)
18.Predict the shift in the equilibrium position that will occur for each
of the following reactions when the volume of the reaction container is
increased.(4pts)
a. PCl5→PCl3+Cl2
b. H2+F2→2HF
19.Identify the Lewis acid and the Lewis base in each of the following
reaction.(4pts)
a.Fe^3+ + 6H2O→Fe(H2O)6^3+
b.H2O +CN-→HCN+OH-
20.When a diprotic acid, H2A, is titrated with NaOH, the protons on the
diprotic acid are generally removes one at at time, resulting in a pH
curve that has the following generic shape:(4pts)
(圖片不清楚 省略)
a.Notice that the plot has essentially two titration curves. If the first
equizalence point occurs at 100.0mL NaOH added, what volume of NaOH
added corresponds to the second equizalence point?
b.If the pH at 50.0mL NaOH added is 4.0 and the pH at 150.0mL NaOH added
is 8.0, determine the values Ka1 and Ka2 for the diprotic acid.
21.
a.Calculate the molar solubility of AgBr in 3.0M NH3. Ksp for AgBr is
5.0*10^-13. The overall formation constant for Ag(NH3)2+ is 1.7*10^7.
(3pts)
b.What mass of AgBr will dissolve in 250.0mL of 3.0M NH3?(3pts)
22.The standard free energies of formation and the stander enthalpies if
formation at 298K for difluoroacetylene (C2F2) and hexafluorobenzene
(C6F6) are
ΔGf(kJ/mol) ΔHf(kJ/mol)
C2F2 191.2 241.3
C6F6 78.2 132.8
For the following reaction:
C6F6→3C2F2
Calculate ΔS and K at 298K. If ΔH and ΔS do not depend on temperature,
please calculate K at 1000K.(6pts)
23.Prove that for a gaseous reaction,
ΔG=ΔG。+RTlnQ
Π(Pproducts)^np
where Q is reaction quotient, Q=─────────.(2pts)
Π(Preactants)^np
24.Under standard conditions, write a balanced equation and calculate the
cell potential, ΔG, and K under 25℃ for the reaction of that an acidic
solution of FeSO4 is exposed to air.(6pts)
25.An excess of finely divided iron is stirred up with a solution that
contains Cu^2+ ions, and the system is allowed to come to equilibrium.
The solid materials are then filtered off, and eletrodes of solid copper
and solid iron are inserted into the remaining solution. What is the value
of the ratio [Fe^2+]/[Cu^2+] at 25℃.(2pts)
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