※ [本文转录自 NTU-Exam 看板] 作者: NBASCIDM (战神) 看板: NTU-Exam 标题: [试题] 97下 林雅凡 普化丙 期中考 时间: Sun Apr 19 18:03:24 2009 课程名称︰普通化学丙 课程性质︰大一必修 课程教师︰林雅凡 开课学院：生农学院 开课系所︰生物产业机电工程学系 考试日期（年月日）︰2009/04/17 考试时限（分钟）：10:20~12:30(130 minutes) 是否需发放奖励金：yes,thanks （如未明确表示，则不予发放） 试题 : 1.Write formulas for the following compound.(5 points) (a)Gallium Hrdroxide (b)Cesium Peroxide (c)Potassium Nitrite (d)Lithium Dihydrogen phosphate (e)Iodorous acid 2.Name the following compound.(10 points) (a)Mn(CN)2 (b)As4O10 (c)Sr(ClO)2 (d)Ba(HSO4)2 (e)Cr2O3 3.The mass spectrum of elemental bromine (Br2) is shown below. The peaks are at 79,81,158,160 and 162. (a)It is known that the principal isotope of bromine might be 80Br. However,this isotope does not occur naturally. Please account for the observed weighted average atomic mass.(2 points) (b)Why is the peak at 160 about twice the height of the ones at 158 and 162? (3 points) 4.The mass ratio of oxygen to magnesium in the compound magnesium oxide is 0.6583:1. What mass of magnesium oxide will form when 2.000g of magnesium is completely converted to magnesium oxide by burning in pure oxygen gas? (5 points) Which law can be used to calculate the pervious answer? Also describe the law briefly.(5 points) (Atomic weight:Mg:24.31;O:16.00) 5.Predict the shapes of the following species and their electron-group geometries. Also describe the hybridization scheme in each of them,and then predict which would have resultant dipole moments.(12 points) A.NO2F B.XeF4 C.XeF2 6.Hydrogen azide,HN3,is an acid in aqueous solutions. Its salts are quite reactive. The structures of hydrogen azide is indicated below. (a)White all of the possible Lewis structures and assign the formal charges in each of them.(4 points) (b)Propose hybridzation and bonding schemes consistent with each structure. (4 points) (c)Explain the resultant bonds length and bond angles of HN3 as indicated below.(4 points) 124pm 113pm N—N—N ／113度 171度 H 7.Choose the proper answer according to the given 10 sets of quantum numbers with the order of (n,l,ml): A.(4,0,0) B.(2,1,-1) C.(3,1,2) D.(4,3,1) E.(1,1,0) F.(3,1,0) G.(4.2.-2) H.(3,2,0) I.(2,0,-2) J.(5,1,-1) (Do not forget to give the reason of yor choices!)(12 points) (a)For all atoms,which sets of quantum numbers would indicate the p orbitals? (b)For all atoms,which sets of quantum numbers are not permissible? (c)For the krypton atom,which sets of quantum numbers may be occupied only in the transition state? (d)For the Hydrogen atom,which sets of quantum numbers represent the degenerate oribtals? 8.Explain the following statments from bonding viewpoints or their electron properties.(18 points) (a)Both C and Si atom are the elements of IVA Group. However,CO2 is a simple molecular compound while SiO2 is the covalent network solid. (b)In normal state,hydrogen exists as a diatomic molecule while helium exist as a mono-atomic structure. (c)V2O5 is diamagnetic while V2O3 is paramagnetic. (d)The 4th ionization energy of aluminum is over four times its value for I3. However,I4 for gallium is only about twice its value for I3. (e)Se2-,Br-,Rb+ and Sr2+ are isoelectronic with each other. (f)In Se2-,Br-,Rb+ and Sr2+,Se2-,Se2+ is the largest and Sr2+ is smallest. 9.(a)Draw the Molecular orbitals of C2,N2 and O2.(6 points) (b)Use MOT to compare C2 and C2 2-,O2 - and O2 2-,with respect to bond order and magnetic properties.(8 points) 10.Do you think MgCl2(s) is more stable than MgCl(s)?Explain. Enthalpy of sublimation of Mg,150KJ/mol;first ionization energy of Mg(g),738KJ/mol; second ionization energy of Mg(g),1451KJ/mol;enthalpy of dissociation of Cl2(g),243KJ/mol;electron affinity of Cl(g),349KJ/mol;and lattace energy of MgCl(s) and MgCl2(s),676 and 2500KJ/mol,with respective. (You need to judge whether it is an exothermic or endothermic reaction in each values.)(12 points) 11.The hydrgen radial probability distribution functions of 2s and 3s are shown below. (a)Indicate their spherical nodes(express by r/a0). What do they mean in these figures?(5 points) (b)According to these distribution functions,do you expect 2s or 3s is larger? Explain your answer.(4 points) (c)What is the meaning of Ψ^2? What is the meaning of 4πr^2Ψ^2?(6 points) 12.Two structures(π bonds are not shown)can be drawn by cyanuric acid: H H ︳ ︳ O N O O N O ╲ ╱ ＼ ／ ／ ╲ ╱ ╲ ／ C C H C C ︳ ︳ ︳ ︳ N N N N ／ ╲ ╱ ╲ ＼ ／ H C H C ︳ ︳ O O ╲ H (a)Finish the Lewis structure in each molecule, and indicate how many σ and π bonds there are in each of them. Also give the hybirdization of the carbon and nitrogen atoms in each structure.(6 points) (b)Are these two "resonance" structures? Why or why not?(5 points) (c)Use bond energies to predict which form is more stable;that is,which contains the strongest bonds?(10 pionts) --

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