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課程名稱︰普通化學上
課程性質︰大一共同必修科
課程教師︰鄭淑芬
開課學院：工學院
開課系所︰化工系
考試日期（年月日）︰2008/12/5
考試時限（分鐘）：1小時&45分鐘
是否需發放獎勵金：是!!當然囉a___a
（如未明確表示，則不予發放）
試題 :
Single Choice Questions:(20%, 2 points per question)
1.How many "equivalent" atoms are in a unit cell of body-centered cubic
structure?
(a)1 (b)2 (c)3 (d)4 (e)5
2.Which of the following is polar?
(a)SF6 (b)ICl4(-) (c)SF4 (d)AsF6(-) (e)XeF4
3.The molecules OF2 and O3 both have bent shapes. What are the approximate
bond angles in OF2 and O3, respectively?
(a)109°and 120°
(b)both 109°
(c)both 120°
(d)both 180°
(e)109°and 180°
4."Doping" pure silicon with phosphorus results in a _______ material.
(a)ionic conductor
(b)n-type semiconductor
(c)p-type semiconductor
(d)insulator
(e)superconductor
5.Which of the following has the highest molar enthalpy of vaporization?
(a)Xe (b)LiBr (c)H20 (d)I2 (e)Hg
6.Which of the following substances has the highest boiling point?
(a)C2H6 (b)Ar (c)CH2Cl2 (d)HF (e)HCl
7.Which of the following gases would you predict to have the largest value
of the van der Waals coefficient b?
(a)C2F2Cl2 (b)C2FCl5 (c)C2F4 (d)Cl2 (e)F2
8.Which of the following gases will have you largest root mean square speed
at 100℃?
(a)water (b)argon (c)methane (d)nitrogen (e)oxygen
9.If the interaction between two species is proportional to 1/r^6, which of
the following is likely involved?
(a)chloromethane molecules in the gas phase
(b)chloromethane molecules in the solid phase
(c)Li(+) and H2O
(d)Na(+) and H2O
(e)ions in an ionic solid
10.Which of the following are diamagnetic?
(a)O2(+) (b)O2(-) (c)N2(2+) (d)N2(2-) (e)O2
Descriptive & Calculating Questions
11.Briefly explain the following terms, and give an equation or an example for
each of them: (15%)
(a)Shottky defect (b)Law of Dulong & Petit
(c)First law of thermodynamics (c)Liquid crystal
(e)Ionic liquid
12.An oxygen tank kept at 20℃ contains 28.0 moles of oxygen and the gauge
reads 31.0 atm. After two weeks, the gauge reads 10.5 atm. How many moles
of oxygen were used during the two-week period? (5%)
13.Estimate the molar heat capacity of carbon dioxide gas. In addition to
translational and rotational motion, there is vibrational motion. Each
vibrational degree of freedom contributes R to the molar heat capacity. The
temperature needed for the vibrational modes to be assessable can be appro-
ximated by θ=hν(vib)/k, where k is Boltzmann's constant. The vibrational
modes have frequencies 1.65 x 10^13 Hz,3.35 x 10^13 Hz,and 4.25 x 10^13 Hz,
(a)What's the molar heat capacity (at constant pressure) at 400.K?
(b)What's the molar heat capacity (at constant volume) at 1000.K?
(c)What's the high-temperature limit of the molar heat capacity at constant
volume?
14.A piece of stainless steel (specific heat = 0.652J/g℃) is taken from an
oven at 238℃ and immersed in 255mL of water (specific = 1.00cal/g℃) at
24.8℃. The water temperature rises to 53.6℃. Whatis the mass of the
piece of steel? (5%)
15.Calculate the heat required to convert 10.0g of propanol, C3H7OH, from a
solid at -150℃ into a vapor at 120℃. The normal melting point and boiling
point of C3H7OH are -127℃ and 97℃ , respectively. The heat of fusion is
5.18 kJ/mol, and the heat of vaporization is 41.7kJ/mol. The heat capacit-
ies of the solid, liquid,and gas states are 142, 170 and 108J/mol-K,respec-
tively.
16.Copper metal has a density of 8.92g/cm^3 and its atomic radius is 128pm
(Atomic weight of Cu = 63.5)
(a)Is Cu in a body-centered cubic or face-centered cubic unit cell? (5%)
(b)How many copper atoms in a unit cell? (1%)
(c)What's the coordination number of the copper atom? (1%)
17.Flausthalite is a mineral of PbSe. The mineral adopts a NaCl type structu-
re. The density of PbSe at 25℃ is 8.27g/cm^3 (Atomic weight Pb=207, Se=
79)
(a)Calculate the length of an edge of the PbSe unit cell. (5%)
(b)Calculate the distance between Pb(2+) and Se(2-) ions in the structure.
(3%)
18.(a)Show the molecular orbital energy level diagram for NO.
(b)For NO,NO(+), and NO(-), which of them are paramagnetic? Put them
in the order of decreasing the both length,and account for your answers.
19.In both the molecule XeOF2 and the ion XeF3(-), an xenon atom is bonded
to three other atoms. Please comment on the geometric shapes of these
two species and the hybridization of the central xenon atom in each case.
(8%)
20.Estimate the standard enthalpy of the following reactions (12%)
(a)standard ebthalpy of formation of N20(NNO).
(b)H2CCH2 + H2O -> CH3CH2OH
(c)standard enthalpy of formation of HNO2.
Table of Bond enthalpies,kJ/mol
============================================================================
Bond bond enthaply | Bond bond enthaply
H-H 436 | C-C 348
*O--O 496 | C--C 612
*N---N 944 | N-N 163
C-H 412 | N--N 409
N-H 388 | N-O 210
O-H 463 | N--O 630
C--O 743 | C-O 360
============================================================================
* --代表雙鍵,---代表三鍵
21.In 2.00 min, 100ml of He at 0℃ effuses through a small holes. At the same
temperature, it takes 6.40 min for the same volume of a mixture of O2 and
O3 to effuse through the hole.
(a)Calculate the percent composition by volume of the mixture (5%)
(b)When the temperature is raised to 20℃, how long does it take for this
nuxture gas to diffuse through the hole? (3%)
<00:41:23.09>
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◆ From: 140.112.240.149
※ 編輯: k0185123 來自: 140.112.240.149 (12/05 19:04)
※ 編輯: k0185123 來自: 140.112.240.149 (12/05 19:05)