课程名称︰普通化学丙 课程性质︰必修 课程教师︰张大钊 开课学院：医学院 开课系所︰药学系 考试日期（年月日）︰11/26/2008 考试时限（分钟）：120 是否需发放奖励金：是的，谢谢 （如未明确表示，则不予发放） 试题 : 1.Name the following compounds:(6pts) Ca(ClO)2 N2O4 (NH4)2SO4 MgCrO4 HNO2 KIO4 2.Write formulas for the following compounds(6pts) Calcium hydroxide Chromium(II)acetate Diphosphorus pentoxide Potassium cyanide Copper(II) nitrate Barium carbonate 3.Sodium sulfide reacts with silver nitrate in aqueous solution to give silver sulfide and sodium nitrate.How many grams of silver sulfide can be produced from the reaction of 3.94g of silver nitrate with excess sodium sulfide.(6pts) 4.Burning 0.44 of an unknown sample in excess oxygen yelids 0.882g of CO2 and 0.36g of H2O. The molar mass is 0.88g. Determine its empirical formulas and molecular formulas?(6pts) 5.The verapamil(C27H38O4N2)is a drug for heart therapy. Determine the molar mass of verapmil. If the tablet contains 120mg of verapmil, calculate the number of moles of verapmil in one tablet and the number of nitrogen atom in one tablet.(6pts) 6.A simple model of "a particle in a box" was applied to demonstrate the existence of quantized electronic energy levels. Using Schrodinger equation Hf(x)=Ef(x),to calculate the energy (E) of a particle in a box. 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 equation for energy (b)Assuming butadiene(C4H6)is a lineal molecular, the effective chain length for the movement of π-electrons is 5.78A, calculate the wavelength of lowest energy transition,where h=6.626x10^-34Js and m=9.11x10^-31kg(16pts) 7.(a)What is the meaning of "orbital"in the Bohr model and in the wave equation model for the hydrogen atom? (b)Why does Bohr's model of the hydrogen atom fail? (c)Although orbital are mathematical functions-solutions to modified Schrodinger equation, can you give a model to verify whether the orbital exist? (16pts) 8.Explain why the energy level is proportional to(n^2) in a box, ut is proportional to (1/n^2) in hydrogen atom by using wave equation,where n is an integer(1,2....)(8pts) 9.Using the Schrodinger equation to solve the hydrogen atom ,three quantum numbers were obtains for the construction of the periodic table (a)Describe the relationship among n ,l ,ml, (b)If n=4, list the possible values for m and ml?(10pts) 10. (a) What is the e- configuration for the most stable ion for 34Se 35Br and 38Sr (b)Order their ionic size(6pts) 11.(a)Draw all possible Lewis structures of SCN-and (b)determine which one is the most probable one withe you justification.(8pts) 12.Indicate the hybridization schemes for the central atoms in each of the following molecules:C2N2 and HNCO.Are the four atoms of each molecule in the line?(6pts) 13.Give the hybridization and predict the geometry of each atom in the moleculars or irons:IF2+, BF3, OSF4, XeF4 and IF5(10pts) 14.Draw MO of CN+ and CN-,which has the stronger bond? Is either of these ions paramagnetic? 15.The enthalpy of sublimation of Na(s), the ionization energy of Na(g), the bond energy of Cl2 and energy of electron affinity of Cl(g) are 107,496,244 and -349kJ/mol, respectively. In addition the lattice energy of NaCl(s) is -787kJ/mol.Calculate the overall reation of Na(s)+1/2Cl2(g)→NaCl(s).Explain why sodium chloride exists as NaCl,not as Na2+Cl2- 16.It is known that CO can bond to iron in hemoglobin through carbon atom. (a)On the basis of electronegativities, which atom would you expect to bond to iron (b)On the basis of formal charges ,which would you expect to bond to iron? (c)In the MO model, bonding MOs place more electron density near the more electronegative atom, while anti-bonding MOs place more electron density near the less electronegativities atom in the diatomic molecule.Use the MO model to predict which atom should bond to iron?(10pts) 17.Quantum mechanical model provides the possible energy levels (HΨ = EΨ) and the probability of the electron in the orbital (∫Ψ*Ψdx). 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 using variation method. Note that there are two delocalized π-electrons. H=ΣHi and Ψ=ΠΦi, where Φi=ΣCijΨij and assuming <ΨiJ︱Hi︱ΨiJ'>=α if J=J', <ΨiJ︱Hi︱ΨiJ'>=β if J and J' are neighbor, <ΨiJ︱Hi︱ΨiJ'>=0 otherwise. (a)Calculate the resonance energy for secular equation and draw energy diagram. (b)Drive the wave function (c)Calculate electron density of the ground state and first excited state of Oa and Ob atoms in O3 molecule (d)Following question 16,predict which O atom should bond to Cl- ion? --

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