課程名稱︰普通化學甲下
課程性質︰
課程教師︰陸駿逸
開課學院：理學院
開課系所︰化學系
考試日期（年月日）︰2006/8/18
考試時限（分鐘）：
是否需發放獎勵金：是的，謝謝^^
（如未明確表示，則不予發放）
試題 :
General Chemistry Exam I 2006/08/18
1.Classical mechanics expect mv^2/r=e^2/4πε0r^2 for the hydrogen atom, where
m is the electron mass , v the electron speed, r the radius of the circular
orbit, e the electron mass ε0 the vacuum permittivity. Bohr model adds one
more condition to obtain the correct energy levels.(a)(4 points)What is the
Bohr's condition? (b)(4 points)What is the physical meaning of the condition?
(c)(10 points)Derive the general formula of the energy levels for the hydrogen
atom.
2.(10 points)Calculate the wavelength of the electromagnetic radiation required
to excite an electron from the ground state to the level n=2 in one dimensional
box 10nm in length. (m=9.1 x 10^-31 kg, h=6.6 x 10^-34 J sec, c=3.0 x 10^8
m/sec)
3.(15 points)Estimate ΔH for the following reaction, using bond energies.
O
∥
H2C=CH2(g)+O3(g) → CH3CH(g)+O2(g)
The following bond energies are given.
C=C (614 kJ/mol)
O-O (146 kJ/mol)
C-H (413 kJ/mol)
C-C (347 kJ/mol)
C=O (745 kJ/mol)
C-O (413 kJ/mol)
4.(a)(20 points)Draw the Lewis structures for the following species. When there
are more than one possibility, draw the one with the most reasonable formal
charges on each atoms.(b)(12 points)Using the VSEPR to predict the molecular
shapes and determine the suitable center atom hybridization.
a.POCl3 b.SO2Cl2 c.PF5 d.PH3
5.(15 points)Using the molecular orbital model to describe the bonding in CO,
CO+, and CO2+, predict the bond orders. How many unpaired electrons are present
in each species?
1 35
6.(10 points)The infrared spectrum of HCl( H Cl)shows the v=0 to v=1
absorption at 2900 cm^-1. Calculate the vibrational force constant for the HCl
molecule. (c=3.0 x 10^8 m/sec, 1 amu=1.7 x 10^-27 kg)
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