課程名稱︰普通化學丙
課程性質︰共同必修
課程教師︰張大釗
開課系所︰獸醫、植微
考試時間︰93/10/29
試題 :
Ⅰ.Quick answer 6 out of 7 questions.(60%)
1.What is the observation that most clearly supports the statement of that
electrons in atom have quantized energies?
2.What is the probability of finding a particle in a one-dimesional box in
energy level n=5 between x=2L/5 and x=3L/5? (L is the length of the box.)
3.How many f orbitals for n=3? (n is the principal quantum number.)
4.Place the B2, C2, N2, O2, F2 molecules in order of increasing bond energy.
(數字均在右下角)
5.Determine the orientation of the dipole moment: CH4, CHCl3, CH3Cl2, CO2,
H2O.
6.What is the hybridization of the central atom in SF3+?
7.Using a MO energy-level diagram, would you expect F2 to have a low or higher
first ionization energy than atomic fluorine? Why?
Ⅱ.Answer 2 out of 3 questions.
1.The enthalpy of sublimation of Na(s), the ionization energy of Cl2(g) and
the energy of electron affinity of Cl(g) are 107, 496, 244 and -349 kJ/mol,
respectively. The lattice energy of NaCl(s) is -787 kJ/mol. Calculate the
overall reaction of Na(s) + 1/2Cl2(g) → NaCl(s).(20%).
2.What are the electron configurations of the elements with atomic number of
20X and 35Y? Which one has large atomic radius? Which one has large ionic
(數字均在左下角)
size? Which one has high electronegativity? Why? (20%)
3.Spectroscopy is one of the most useful tools available to the scientist.(30%)
Absorption spectrum: I = I exp(-εCx), where I and I are the light
° °
intensities after and before the sample, ε is the molar extinction
coefficient, C is concentration and x is the optical path. Design a simple
experiment to test Beer' law, for example measuring the intensity as a
function of concentration. What information can you obtain from this
experiment?
︿
Ⅲ.Quantum mechanical model provides the possible energy levels ( HΨ = EΨ)
and the probability of the electron in the orbital (∫Ψ*Ψdx).(40%)
Please use MO-LCAO method to calculate resonance energy and electron density
of the ground state and first excited state of O3 molecule (OA=OB-OC) by
(3,A,B,C均在右下角)
using variation method. Note that there are two delocalized π-electrons.
︿ 2 2 c
H = ΣHi and Ψ = ΠΦi, where Φi=ΣΨiJ and assuming <ΨiJ｜Hi｜ΨiJ'>
i=1 i=1 J=A
=α if J=J', <ΨiJ｜Hi｜ΨiJ'> =β if J and J' are neighbor,
<ΨiJ｜Hi｜ΨiJ'> = 0 otherwise.
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