※ [本文转录自 NTU-Exam 看板] 作者: abacada (力量的极限) 看板: NTU-Exam 标题: [试题] 90年下 周必泰 普通化学甲下期中考partB 时间: Fri Jan 28 00:51:18 2005 单选题(3%*20=60%) 1.Li(s) → Li(g) heat of sublimation of Li(s)=166 KJ/mol HCl(g) → H(g) + Cl(g) bond energy of HCl=427 KJ/mol Li(g) → Li(g)+ + e- ionization energy of Li(g)=520 KJ/mol Cl(g) + e- → Cl-(g) electron affinity of Cl=-349 KJ/mol Li(g)+ + Cl-(g) → LiCl(s) lattice energy of LiCl(s)=-829 KJ/mol H2(g) → 2H(g) bond energy of H2(g)=432 KJ/mol Calculate the net change in energy for the reaction: 2Li(g) + 2HCl(g) → 2LiCl(s) + H2(g) a)363 KJ b)-562 KJ c)-179 KJ d)-73 KJ e)non of above 2.Which of the following is the correct order of molecules from most to least polar? a)CH4 > CF2Cl2 > CF2H2 > CCl4 > CCl2H2 b)CH4 > CF2H2 > CF2Cl2 > CCl4 > CCl2H2 c)CF2Cl2 > CF2H2 > CCl2H2 > CH4 = CCl4 d)CF2H2 > CCl2H2 > CF2Cl2 > CH4 = CCl4 e)CF2Cl2 > CF2H2 > CCl4 > CCl2H2 > CH4 3.Which of the following is NOT a valid resonance structure for N3-? .. .. .. - a) [ Ｎ＝Ｎ─Ｎ: ] '' '' .. - b) [ Ｎ≡Ｎ─Ｎ: ] '' '' .. - c) [:Ｎ—Ｎ≡Ｎ: ] '' .. .. - d) [ Ｎ＝Ｎ＝Ｎ ] '' '' 4.Which molecule has the smallest bond angle? a)O3 b)OF2 c)HCN d)SSe3 5.Which element does E represent in the formula below? 　　 :Ｏ: a)Si .. ∥ - b)S [:Ｏ－Ｅ－Ｈ] c)As ''　∣ d)Xe 　　 :Ｏ: e)B '' 6.Consider the compound crotonaldehyde H H H H | | | | H─C1─C2─C3─C4─O | H How many nonbonding electrons appear in the Lewis structure of this molecule ? a)2 b)4 c)6 d)8 e)10 7.In the following Lewis structure 　　Ｈ　　　Ｈ Ｈ 　　｜　..　｜ │ .. Ｈ─Ｃ─Ｏ─Ｃ─Ｃ≡Ｃ─Ｃ＝Ｎ─Ｈ │　''　│1 2 3 4 　　Ｈ　　　Ｈ What is the hybridization of the oxygen atom and carbon atoms 1,2,and 4, respectively? O C-1 C-2 C-4 a)sp3 sp3 sp sp2 b)sp sp3 sp sp c)sp sp2 sp sp2 d)sp2 sp3 sp2 sp3 e)sp sp3 sp2 sp 8.Which of the following has the largest bond energy? a)O2 b)O2 - c)O2 2- d)O2 + e)O2 2+ 9.Order the molecules C2, B2, H2 and N2 from the shortest to largest bond length a)H2, N2, C2, B2 b)N2, C2, B2, H2 c)C2, N2, H2, B2 d)C2, B2, H2, N2 10.Which statement is NOT true? a)Electrons are never found in an antibonding molecular orbital b)All antibonding molecular orbitals are higher in energy than the atomic orbitals of which they are composed c)Antibonding molecular orbitals have electron density mainly outside the space between the two nuclei 11.Which of the following statements about the CO3 2- ion is FALSE? a)The orbitals on the carbon atom are sp2 hybridized b)The ion is expected to be diamagnetic c)One C-O bond is shorter than the other d)The ion has a total of 24 electrons 12.A wave function is expressed as Ψ = (1/81√(3π))((Z/a0)^(3/2))(27-18σ+2σ^2)e^(-σ/3) specify the corresponding orbital? a)1s b)2s c)2pz d)2px e)3dz^2 f)3s 13.The hybridization of the central atom in SeF4 is a)sp b)sp2 c)sp3 d)dsp3 e)d2sp3 14.Use the energy-level diagram for the hydrogen atom. Select the TRUE statement. a)A transition from n=5 to n=3 involves greater energy than one from n=4 to n=2 b)The transition from n=4 to n=2 emits radiation of longer wavelength than the transition from n=5 to n=1 c)All transitions from states for which n>1 to the n=1 state involve the absorption of energy by the atom d)A transition from n=2 to n=∞ corresponds to the ionization energy of the H atom 15.Which of the following is a reasonable criticism of the Bohr model of the atom? a)It makes no attempt to explain why the negative electron does not eventually fall into the positive nucleus b)It does not adequately predict the line spectrum of hydrogen c)It does not adequately predict the ionization energy of the valence electron(s) for elements other than hydrogen d)It does not adequately predict the ionization energy of the first energy level electrons for one-electron species for elements other than hydrogen e)It shows the electrons exist outside the nucleus 16.Which is the electron configuration of the element with atomic number 109? a)[Rn]7s2 5f14 6d7 b)[Rn]7s2 6f14 6d1 7p6 c)[Rn]8s2 7f14 6d7 d)[Xe]7s2 5f14 6d7 e)[Re]7s2 6d7 17.An element with the electron configuration [Kr]4d10 5s2 5p2. The formula for the fluoride of E is most likely a)EF14 b)EF4 c)EF d)EF6 e)EF8 18.Choose the pair of sequences that arranges, respectively, the atomic radius and ionization energy from the smallest to largest? a)S, O, F and F, O, S b)F, S, O and O, S, F c)S, F, O and S, F, O d)F, O, S and S, O, F 19.What is the probability of finding a particle in a one-dimensional box in energy level n=4 between x=L/4 and x=L/2? (L is the length of the box) a)12.5% b)25% c)33% d)37.5% e)50% 20.A first-order reaction is 35% complete after 55 minutes. What is the lifetime of this reaction? a)530 min b)0.028 min c)88 min d)128 min e)176 min f)none of these 解答:edabb baeaa cfdbc abdbd --

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