北京化工大学《无机化学》(双语)期末考试模拟试卷-A-答案.pdf

北京化工大学 北京化工大学 Model of Final Examination of Inorganic Chemistry bi lingual course Course code 课程代码 C H M 2 1 7 0 T Class No Class No Name and ID Name and ID Items 题号 Items 题号 一一二二三三四四五五六六Total score 总分 Total score 总分 Score 得分 Score 得分 一 是非题 判断下列叙述是否正确 正确的在括号中画一 是非题 判断下列叙述是否正确 正确的在括号中画 错误的画 错误的画 不必 写在答题纸上 不必 写在答题纸上 本大题共 10 小题 每题 1 分 共 10 分 1 x 2 x 3 x x 4 5 5 6 6 7 x 8 x 9 x 10 x 7 x 8 x 9 x 10 x 二 选择题 在下列各题中 选择出符合题意的答案 将其代号填入括号内 二 选择题 在下列各题中 选择出符合题意的答案 将其代号填入括号内 本大题共 20 题 每题 1 5 分 共 30 分 1 B 2 D 3 B 4 A 5 C 6 B 7 D 8 A 9 D 10 B 11 B 12 B 13 B 14 C 15 A 16 C 17 B 18 B 19 B 20 D 三 三 Please fill in the blank with correct words symbol or data according to the requirements 10 questions 2 score question 20 score in total 1 六氟合硅 IV 酸四氨合镍 II Co H2O 2 NH3 4 Cl3 2 a b 3 12 39 0 011 4 HNO3 He2 H2 B4H10 H3PO4 5 Formation of new matter break and form of new chemical bonds change of energy 6 Same minium energy principle Pauling incompatibility principle and Hund rule 7 1s2 1s 2 2s2 2s 2 2p3 1 5 a paramagnetic 8 4 3x10 6 8 63 9 Na2CO3 CaCO3 MgCO3 CuCO3 第 1 页 Al2O3 AlF3 AlCl3 10 HgO 2e H2O Hg 2OH Zn 2e 2OH Zn OH 2 NaO Zn s Zn OH 2 s OH aq HgO s Hg s 四 四 Please balance the following chemical equations 5 equations 2 points for each one 10 points in total 1 PbCl2 H2O Pb OH Cl HCl 2 B2H6 g 6 H2O l 2H 3BO3 6H2 3 2 Ni OH 2 ClO 2NiO OH Cl H2O 4 2 KMnO4 5 H2O2 3 H2SO4 2MnSO 4 5 O2 K2SO4 8H2O 5 Hg22 4 I excess Hg HgI42 五 五 Simple questions two questions 5 points for each one 10 points in total 1 Anwser O as its valence electron shell is 2s22p4 When one e is removed more energy is required to remove the second e when the p orbital is half filled which is stable in view of energy 2 Answer Addition of excess NaOH to the solution of Zn2 Co2 and Al3 results in precipitate of Co OH 2 and formation of soluble Al OH 4 and Zn OH 4 complexes Separate the precipitate Co OH 2 by centrifugation from the solution then add HCl NH3 H2O acetone KSCN subsequently to Co OH 2 blue color will be observed indicating the presence of Co2 To the solution of Al OH 4 and Zn OH 4 complexes is added HCl and NH3 H2O then Al OH 3 precipitate will form which is separated and identified by forming red solid after reaction with HAc and Al regeant the Zn2 is identified by formation of white ZnS after reaction of Zn2 with Na2S 六 六 Answer the following questions according to requests 4 questions 20 points in total 1 5 points 1 Anwser 1 AgCl Ag Cl At equilibrium x 0 05 第 2 页 0 05x Ksp AgCl 1 77 x 10 10 x 3 54 x 10 9 molL 1 Ag 2NH3 Ag NH3 2 Initial 0 1 y 0 At equilibria 3 54 x 10 9 y 2 0 1 3 54 x 10 9 0 1 3 54 x 10 9 0 1 3 54x10 9 3 54 x 10 9 y 2 0 1 3 54 x 10 9 2 Kf Ag NH3 2 1 12 x 107 y 1 79 molL 1 the total concentration of NH3 is 1 79molL 1 2 AgI Ag I 3 54x10 9 0 001 3 54x10 9 x 0 001 3 54 x 10 12 Ksp AgI 8 52 x 10 17 So AgI precipitates 2 5 points Anwser p SbCl5 initial nRT V 0 0125mol x8 314J K 1 x 521K 3 50L 15 47KPa SbCl5 g SbCl3 g Cl2 g Initial KPa 15 47 0 0 At equilibria 15 47 x x x X 100 2 15 47 x 100 KP 1 07 x P SbCl3 P Cl2 13 71Kpa P SbCl5 15 47 13 71 1 76kpa Ptotal 1 76 13 71 x 2 29 17kpa 3 5 points Anwser Ag2SO4 s 2Ag SO42 0 01 x 0 012x Ksp Ag2SO4 1 4 x 10 5 X 0 14 CaSO4 s Ca2 SO42 0 01 y 0 01y Ksp CaSO4 9 1 x 10 6 y 9 1 x 10 4 So Ca2 precipitates first 第 3 页 When Ag begins to precipitate CaSO4 s Ca2 SO42 z 0 14 z2 x 0 14 Ksp CaSO4 9 1 x 10 6 z 6 5 x 10 5 M 4 5 points Anwser 1 Cu2 aq 2e Cu s 1 rGm 1 zFE1 2F x 0 3394V Cu aq e Cu s 2 rGm 1 zFE2 1F x 0 5180V 1 2 x 2 3 Cu 2 aq Cu s 2 Cu aq 3 rGm 3 RTlnK rGm 1 2 rGm 2 rGm 3 2F x 0 3394 2 x 1F x 0 5180 RTlnK 2 x 96485 x 0 3394 2 x 96485 x 0 5180 8 314 x 298 ln K K 9 1 x 10 7 2 Cu2 aq 2e Cu s 1 rGm 1 zFE1 2F x 0 3394V Cu aq e Cu s 2 rGm 1 zFE2 1F x 0 5180