課程名稱︰普通化學丙
課程性質︰課本Chemical Principles, The Quest for Insight 3rd Edition
作者為 Peter Atkins & Loretta Jones
課程教師︰陳竹亭
開課系所︰電機系
考試時間︰October 21,2005
試題 :
1.Consider the following statements about the electomagnetic radiation and
decide whether the are true or false. Explain your answer or make a correct
example about the false ones.(15)
(a)As the temperature of a black body increases, the wavelength at which the
maximum intensity is found increases.
(b)photons of IR radiation are higher in energy than photons of UV radiation.
(c)Heisenberg uncertainty principle can not be applied to the eletromagnetic
radiation at 0 K
(d)the kinetic energy of an election ejected from a metal surface when the
metal is irradiated with UV is independent of the frequency of the radiation.
(e)the elections that hit a metal surface and can result in the diffraction
pattern have to have the speed of light.
2.With the given election density contour below:
(兩張圖片，不知道該怎麼提供@@)
(a)Draw the information from each figure by first determining the
corresponding n and l values. Explain.(6)
(b)Draw the Radial probability distribution along the directions that have the
maximum probability for each plot.(6)
3.Using the model of "particle in the box" and the data in Table 2.4 to
estimate the energy difference for the ground-state π-elections in ethylene
and in butadiene? (10)
4.Write the Lewis structure, including typical contributions to the resonance
structure(where appropriate, allow for the possibility of octet expansion)(10)
(a) dihydrogen phosphate
(b) chlorite ion
(c) chlorate ion
(d) phosphorous acid
(e) chlorine nitrate
5.Infrared spectroscopy is and important tool for studying vibrations of
molecules. Just as an atom can absorb a photon of suitable energy to move an
election from one electronic state to another, a molecule can absorb a photon
of infrared radiation to move one vibrational energy level to another. In the
IR spectroscopy, it is common to express the engery in cm^-1(wave-number).
(a)The N-H vibration(as in p.85) is about 3400 cm^-1. How much energy in Joule
for the N-H vibration would be absorbed by 1.00 mol of the molecules?(6)
(b)The electronic transitions are usually in the UV-visible region. Estimate
the energy in Joules that will be required for a transition as in Figure 1 of
p.124 (6)
6.Draw the 3-D structure for the following molecules and describe the
hybridization of the central atom.(10)
(a) NH3 (b) HN3 (c) H2SO4 (d) HNO3 (e) SF4
7.Draw the VSEPR structure(including the lone pairs) and predict the bond
angles involving the central atom for the following compounds.(10)
(a) COCl2 (b) CH3 - (c) XeOF2 (d) IF3 (e) BrO3 -
※ (b) (e) 的 - 表示負一價，後面的離子也用類似的方式表示。
8. Consider a hypothetical species of HeH:
(a)What charge should be present on this species to allow the most stable
molecule? Explain by drawing the MO energy diagram.(5)
(b)If the charge on this species were increased or decreased by one, what
would be the effect on the bond order for the molecule?(5)
9.Consider the molecules H2CCH2 H2CCCH2, H2CCCCH2:
(a)Draw Lewis structures for these molecules.(3)
(b)What is the hybridization at each carbon atom?(5)
(c)Describe the C-C bonds and predict the C-C-C angles in these mnolecules.(5)
(d)Do all the hydrogen atoms lie in the same plane in each molecule?Explain(3)
10.Draw the MO energy diagrams and predict the bond order the magnetism for
the following species.(15)
(a) O2 - (b) O2 + (c) O2 2- (d) N2 (e) B2
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