課程名稱︰普通化學丙
課程性質︰
課程教師︰簡淑華
開課系所︰化學系
考試時間︰2005.06.21
試題 :
1.Briefly explain or distinguish the following terms:
(1)degenerate orbitals
(2)isoelectronic ions
(3)aromatic and aliphatic compounds
(4)acidic,basic,and amphoteric oxides
(5)valence electrons and core electrons
(6)the Heisenberg Uncertainly Princple and Pauli Exclusion Principle
2.Arrange in order of decreasing the specified properties:
(1)polarity: H-Cl ,Cl-Br,Cl-Cl
(2)first ionization energy:Li,Be,B
(3)atomic radius:K,Ca,S,Cl
(4)ionic radius:K+,Ca2=,S2-,Cl-
(5)wavelegth:IR,UV,microwave
(6)frequency of light:red,yellow,blue
(7)bond angle:CH4,NH3,H2O
(8)electronegativity:N,As,P,F
(9)acid strength:HClO,HClO2,HClO3,HClO4
(10)solubility in water:NaCl,AgCl,AgBr,AgI
3.What is VSEPR method?Use the method to predict the following molecular
geometry:
(a)PF3 (b)XeF4 (c)ClO4 (d)SF5-
4.(a)Write a structural and the condensed tructural formulas for acetic
acid and use the Valence Bond Theory to describe the bonding in the
molecule;(b)Predict the bond angles about each of the two carbon
atoms(c)Draw a likely structure of dimer of acetic acid by using
intermolecular H-bondings.
5.Two ions of O2 are commonly encountered in the oxide of the Group 1A
metals:peroxide ion,O22-,and superoxide ion,O2-.Use molecular orbital
theory to constuct the molecular orbital energy-level diagram for O2
molecule and write teir electron configuration for the two ions.
Then,compare the ions with respect to bond order,bond length,bond energy
and magnetic properties.
6.(1)Given the standard reduction potentials at 25 *C for Cu2+/Cu and
Ag+/Ag(s) are 0.340V and 0.800V respectively, write the half reactions for
the electrode reactions and the overall chemical reaction for the cell:
Cu(s)|Cu2+(aq)||Ag+(aq)|Ag(s)
(2)Calculate E*,G* and the equilibrium constant for the cell reaction.
(3)Write the Nernst equation and calculate E for the following cell:
Cu(s)|Cu2+(0.040M)||Ag+(0.002M)|Ag(s)
7.Answer the following questions by show calculations or give your reasoning:
(1)The mass-to-charge ratio of the proton is found to be 1.044x10^(-8)kg/C
What is its mass?Calculate the wavelength of a proton traveling at a
speed of2.55x10^6 m/s
(2)What are the frequency ,energy and color of light that has a wavelength
of 650nm?
(3)What are the n,l, and m1 quantum numbers corresponding to the 3s orbital?
In what specific subshell will an electron having a quantum numbers
n=3,l=2,and m1=1 be found?
(4)Which group of elements has electron affinities with the largest
negative values?Explain.
(5)The experimental reslt shows the N2O molecule is linear and polar.
Which arrangement,NNO or NON,is correct? Explain your answer.
(6)A molecular having the formula C2H2Cl is found to be non-polar
Write the sturctural formula of the molecule.
(7)The first-orser rate constant for the gas-phase decomposition of N2O5
to NO2 and O2 at 70*C is 6.82x10^-3 s^-1 .If we start with 0.500
mole of N2O5 in a 500-mL container,how long will it take for the quantity
of N2O5 to drop to 0.250 mole?
(8)The rate of a process is found to be twice as fast at 300K as at 290K
What is the activation
energy of the process?
(9)In the x-ray diffraction of a crystal,Cu Ka line with wavelength of 1.54A
was used,a irst-order reflection was otained at an angle of 21.5*C;
Write the Bragg Equation and use it to calculate the distance between the
crystal planes(express in unit of A.nm and pm).Which electronic transition
corresponds to the Cu Ka radiation and why UV light does not result in
the appearence of a diffraction pattern?
(10)At about 1000*C ,iron undergose a transition from the body-centered cubic
structure to the face-centered cubic structure.The edge length of the
unit cell increase from 286pm to 363pm.What are the number of atoms and
mass of each unit cell? Compare the densities of these two forms of iron,
and explain the difference.(Fe=55.8 amu)
(11)Combustion of ethane will produce caron dioxide and water vapor,write
the chemical equation and use the "bind energy" given below to estimate
the enthalpy change for the above gas-phase reaction.
D(C-H)=414; D(C-C)=347; D(O=O)=498; D(C=O)=736; D(O-H)=464 (all in kJ/mol)
(12)6.62g of Pb(NO3)2 was added to a liter of 0.010M NaCl slution, will
you see any precipitate?
(Pb(NO3)2=331g/mol,ksp=2x10^-5 for PbCl2)
8.Give the [H3O+]and the pH of the following solutions:
(a)2.0 M H2SO4
(b)0.0001M H2SO4
(c)0.5M HNO2(Ka=4.0x10^-4)
(d)0.50M NaNO2 solution
(e)a buffered solution conaining 0.50M HNO2 and 0.50M NaNO2
(f)adding 0.010 mole gaseous HCl to 1.0 L of the buffered solution in (e)
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.112.238.111