課程名稱︰普化丙
課程性質︰以物理化學為主
課程教師︰張大釗
開課系所︰pharmacy dentistry
考試時間︰10/21/2005
試題 :
1. What is the Avogadro's hypothesis? Under what assumptions,
this hypothesis is valid? (10pts)
2. What did Balmer observe in the atomic spectrum of hydrogen atom?
Briefly describe why it is important? (10pts)
3. In the Bohr model, the energy level of hydrogen atam is given as
E=2.179x10(-18)(Z2/n2)J, where n is an integer related to orbital
position. Calculate the wavelength associated with the energy change in
promoting an electron from the n=2 to n=4 level in the hydrogen atom.
(h=6.62x10(-34)J and c=3x10(8)m/s)(12 pts)
4. Although the Bohr model could well explain the atomic spectrum of hydrogen
atom, it is not valid for other atoms. what is the major problem of the
Bohr model?(6 pts)
5. Explain (a) the duality of light by the de Broglie?
(b) the uncertainty principle by Heisenberg?
(c) the exclusion principle by Pauli?
(12 pts)
6. What are the n, l and ml quantum number corresponding to the 6s orbital?
List all the possible n, l, ml quantum number for an orbital in the 4s
subshell? (10pts)
7. Using Schrodinger wave equation, Hf(x)=Ef(x), to calculate the energy (E)
of a particle in a box with the length "a". The Hamiltonian operator (H)
is given as H=T+V= -h2/2m(d2/dx2)+V(x).
Assuming V(X)=0 for o<x<a; and v(x)= infinity, otherwise.
The wave function (f(x)) is given as f(x)= alpha sin(kx).
(a) Derive the energy and give the reason for obrainin E=n2h2/8ma2?
(b) Give the reason for obtaining alpha=(2/a)1/2?
(c) What is the probability of finding a particle in a one-diemensional
box in energy level n=4 between x=5a/8 and x=7a/8?
(d) Assuming C6H8 is a linear molecule, the effective chain length for
the movement of pie-electron is 8A, calculate the wavelength of lowest
energy transition. (40 pts)
8. Write the electron configuration for the most stable ion for S, Cl, K,
and Ca. Order their ionize size?
9. Which has the larger bond lengths; No2- and No3-? explain. (10 pts)
10.Arrange the following molecules from most to least polar and explain your
order. CH4, CF2Cl2, CF2H2, CCl4, and CCl2H2. (10 pts)
11.Draw the Lewis Structure of Al2Cl6, predict the bond angles around each Al
atom? Is the molecule polar or nonpolar?(10 pts)
average mark= 89.4
end
※ 編輯: summerfish99 來自: 140.112.238.58 (10/28 13:05)
※ 編輯: summerfish99 來自: 140.112.238.58 (10/28 13:06)