課程名稱︰普通化學丙
課程性質︰醫學系系定必修
課程教師︰牟中原
考試日期︰2007/11/2
考試時限：兩節課
是否需發放獎勵金：是
試題 :
1. In the spectroscopic technique known as photoelectron spectroscopy (PES)
ultraviolet radiation is directed at an atom or a molecule. Electrons
are ejected from the valence shell, and their kinetic energies are measured.
Beacause the energy of the incoming ultraviolet photon is known and the
kinetic energy of the outgoing electron is measured, the ionization energy,
I, can be deduced from the fact that the total energy is conserved. (10%)
(a) Show that the speed v of the ejected electron and the frequency ν of
the incoming radiation are related by
E = hν = I +1/2 Me v(^2) (Me is the mass of an electron)
(b) Use this relation to calculate the ionization energy of a rubidium atom,
given that radiation of wavelength 58.4nm produces electrons with a
speed of 2450km/s; recall that 1 J = 1 kg˙m(^2)/s(^2)
2. Krypton crystallizes with a face-centered cubic unit cell of edge 559pm.
(a) What is the density of the solid Krypton?
(b) What is the atomic radius of Kr?
(c) What percentage of unit cell is empty space if Kr atom is treated as
hard spheres? (Kr Atomic weight = 83.8) (12%)
3.(a) On the basis of the configuration of the neutral molecule F2, write
the molecular orbital configuration of the valence molecular orbitals for:
(1)F2; (2)F2+; (3)F2 2-.
(b) For each species, give the expected bond order.
(c) Which are paramagnetic, if any?
(d) Is the highest-energy orbital that contains an electron σ or π
in character? (16%)
4. When 2.36g of phosphorus was burned in chlorine, the product was 10.5g of
a phosphorus chloride. Its vapor took 1.77 times as long to effuse as the
same amount of CO2 under the same conditions of temperature and pressure.
What is the molar mass and molecular formula of the phosphorus chloride?
(12%)
5. Assign magnetism (diamagnetism or paramagnetism) of the followings.
(1)B2 + (2)CuCl2 (3)Cr 3+ (4)Cl2 (5)NO (10%)
(need explanation)
6. Write correct Lewis structures and assign a formal charge to each atom
for all the resonance structures. Also indicate σ and π bonding when
necessary. (18%)
(a)SO3 (b)C2N2 (in the order NCCN) (c)NO2 - (d)HCN (e)HNO3
(f)The oxalate ion, C2O4 2- (there is a C-C bond with two oxygen atoms
attached to each carbon atom);
7. Predict the shape and hybridization of the center atom of each of the
following molecules (8%)
(a)TeF4 (b)OCCl2 (c)BrF3 (d)SF5 +
8. Please write a short essay on your understandings of elements of the
history of developing the correct atomic weight of elements; in particular
comment the significance of (a)Guy-Lussac gas reaction law (b)Dalton`s
mistake (c)Cannizzaro`s contribution. (15%)
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※ 編輯: ri1966 來自: 220.139.219.69 (12/01 20:09)
※ 編輯: ri1966 來自: 220.139.219.69 (12/01 20:13)