課程名稱︰普通化學乙 (上)
課程性質︰必帶
課程教師︰簡淑華
開課學院：生農學院
開課系所︰森林系
考試日期（年月日）︰2008/01/16
考試時限（分鐘）：2小時(題目太多,有增加10分鐘)
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
1. Briefly explain or distinguish the following terms: [16%]
(1) Endothermic reaction & Exothermic reaction
(2) Open system, closed system & isolated system
(3) Quantum & photon
(4) Ground state & Excited state
(5) The photoelectric effect
(6) The Heisenberg Uncertainty Principle
(7) Electron shielding & Orbital penetration
(8) Degenerate orbital
2. Arrange in order of decreasing the specified properties: [10%]
(1) First ionization energy: Li, Be, B, C, N, O, F, Ne
(2) Electronegativity: Cs, Sb, S, F
(3) Ionic radius: S2-, Cl-, K+, Ca2+
(4) Polarity: H-F, H-Cl, H-Br, H-I
(5) CC bond length: C2H6, C2H4, C2H2
(6) Bond angle: HXH, CH4, NH3, H2O
(7) Melting point: NaF, NaCl, NaBr, NaI
(8) Lattice energy: GaP, BaS, CaO, RbCl
(9) % covalent character: HCl, NaCl, Cl2
(10) Frequency of light: red, green, blue, violet
3. What is the VSEPR method? Use the method to predict the following molecular
geometry: [10%]
(a) BF3, (b) XeF4, (c) PF5, (d) SF6
4. (a) Draw the possible Lewis dot structure for SO4(2-).
(b) Determine the formal charge of each element.
(c) Using argument based on formal charge, explain why the most feasible
Lewis structure for SO4(2-) has 2 sulfur-oxygen double bonds.
(d) What is the hybridization of the central atom in SO4(2-)?
(e) Draw all of the resonance structure for HSO4(-) ion. [8%]
5. Consider the molecule of acetic acid (CH3COOH),
(a) Identify the type if hybridization of the atomic orbitals for each
carbon atom and oxygen atom,
(b) Describe the bonding in the molecule,
(c) Predict the bond angle about each of the two carbon atom,
(d) Draw a likely structure of dimmer of acetic acid by using intermolecular
H-bonding. [8%]
6. Two ions of O2 are commonly encountered in the oxide of the Group 1A metals:
peroxide ion,O2(2-) and superoxide ion, O2(-). Use molecular orbital to
construct the molecular orbital energy-level-diagram for O2 and write their
electron configuration for O2 molecule and the two ions. Then, compare them
with respect to bond order, bond length, bong energy and magnetic properties
[8%]
7. Answer the following questions by showing calculations or give your
reasoning: [10*4%=40%]
(a) What is the first law of thermodynamics? Also give its mathematics
expression.
(b) Define the enthalpy (H) of a system. What is the difference between
△Hf0 △Hf?
(c) A ruby laser emits light at a wavelength of 694.3nm. What is laser? What
are the frequency, energy and color of the laser light?
(h=6.626 x 10^-34 Js)
(d) Describe the Bohr model of the hydrogen atom.
(e) How many subshell and orbitals are contained within the principal shell
with n=3?
(f) Write the de Broglie equation and calculate the wavelength of an
electron (m=1.6 x 10^-31 kg) that is moving at 2.74 x 10^6 m/s.
(g) (i) Determine the number of bonds in the carbonate ion and write the
Lewis dot structure.
(ii) How many resonance structures are there for the carbonate ion?
(h) The HCl molecule has a dipole moment of 1.109D and a bond length of
127.5 pm. Determine the amount of electron transfer from hydrogen to
chlorine. What are the % ionic character and the & of covalent character
(1D = 3.3356 x 10^-30 C m, 1 electron = 1.6 x 10^-19C)
(i) When 5.03 g of KOH is dissolved in 100ml of distilled water in a coffee-
cup calorimeter, the temperature of the liquid increase from 23.0C to
34.7C. The density of water in this temperature range average 0.9969g/dm
. What is the △H(soln) in kJ/mol? Assume the calorimeter absorbed a
negligible amount of heat and, because of the large volume of water, the
specific heat of the solution is the same as the specific heat of water.
(j) The water-gas shift reaction is used industrially on an enormous scale
to obtain hydrogen gas. Calculate △H(rxn)0 for the reaction
CO(g) + H2O(g) --> CO2(g) + H2(g)
Given that △H(f)0[CO(g)] = -110.5 kJ/mol
△H(f)0[CO2(g)] = -393.5 kJ/mol
△H(f)0[H2O(g)] = -241.8 kJ/mol
------------------------------------FINISH-------------------------------------
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※ 編輯: DahilSaIyo 來自: 140.112.204.121 (01/16 19:08)