六、推断题（10分）
某橙黄色粉末状固体A，放入稀硝酸中加热，可以看到无色透明溶液B中产生一种棕黑色沉淀C，取出无色溶液，向此溶液中通入硫化氢气体，有黑色沉淀D析出，此沉淀用水洗净后放入过氧化氢溶液中摇荡，会渐渐转变成白色沉淀E；这种白色沉淀可溶于浓硫酸中，生成无色溶液F，该溶液稀释后又得到白色沉淀E，E也可溶于过量氢氧化钠溶液中，生成另一种无色溶液G，向无色溶液G中加入次氯酸钠溶液，又可以生成黑色沉淀C；C与浓盐酸反应，产生黄绿色气体H，在稀硝酸中，A与硫酸锰溶液反应，生成紫红色溶液I和无色溶液B。 1．试写出A → G的化学式。
2．写出 (1) A生成I、(2) D与H2O2反应、(3) G与次氯酸钠溶液反应的化学（或离
子）方程式。
七、计算题（10分）
?2N2(g) + O2(g)，从实验测出不同温度时各 N2O(g)的热分解反应为2N2O(g)??个起始压力与半衰期值如下：
反应温度 T / K
967 967 1030 1030
初始压力 p0 / kPa
156.787 39.197 7.066 47.996
半衰期 t1/2 / s
380 1520 1440 212
k 1．求反应级数和两种温度下的速率常数 2．求该反应的活化能Ea
3．若1030K时N2O(g)的初始压力为54.00kPa，求压力达到64.00kPa时所需时间。
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Additional Exam (20 points)
1．Each of the questions or incomplete statements below is followed by four suggested answers or completions. Please give your answer that is best in each case.
(1) Which of the following statements, if any, about the nitrosyl halides is incorrect? ( ) (A) All three known nitrosyl halides, FNO, CINO, and BrNO, are bent molecules.
(B) The nitrosyl halides, CINO and BrNO, are prepared by treating nitric oxide with the
corresponding halogen.
(C) Stability is in the order FNO ＞ CINO ＞ BrNO. (D) The nitrosyl halides are powerful reducing agents.
(2) The nitrating mixture of HNO3 and 2H2SO4 in cryoscopic work shows and i factor of 4.
The species responsible are ( )
－
(A) SO42? NO2+ 2H3O+ (B) NO2+ 2HSO4 H3O+
－－－
(C) NO3 HSO4 H3O+ NO+ (D) NO+ 2HSO4 H3O+
(3) The total number of combinations of water that can be mad from 1H1, 1H2, 1H3 and 8O16,
1718
8O and 8O is ( ) (A) 6 (B) 9 (C) 18 (D) 27
(4) Which of the following is a superacid? ( ) (A) mixture of HCl and HNO3 (B) mixture of HSO3F and SbF5 (C) mixture of H2SO4 and HNO3 (D) mixture of HF and HNO3
(5) K3P should hydrolyze to form ( ) (A) phosphine (B) phosphorous
(C) phosphoric acid (D) hypophosphorous acid
(6)A positive catalyst ( ) (A) shifts equilibrium concentrations
(B) lowers the energy of activation of a given reaction
(C) is usually consumed during the process of the reaction (D) is needed for every reaction
(7) Borazine, an inorganic analogue of benzene ( ) (A) will not react with HCl (B) is not isoelectronic with benzene
H2H2BB(D) can be prepared by treating B2H6 (C) has the structure H2BBH2
with NH3 BBH2H2 (8) In chemical kinetics an important assumption with respect to the concentration of an
unstable intermediate in a reaction system is known as the ( ) (A) steady-state principle (B) principle of variability (C) equilibrium principle (D) uncertainty principle
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(9) A set of acceptable styx numbers, B9H15, is ( ) (A) ( 4 5 2 2 ) (B) ( 8 1 5 ?2 ) (C) (7 3 5 3 ) (D) ( 6 3 3 0 )
(10) In comparison with HCl, the bond energy of DCl is ( ) (A) higher for DCl (B) lower for DCl (C) the same for both DCl and HCl
(D) sometimes higher and sometimes lower for DCl, depanding on the temperature and
the concentration
2．(5 point) The following mechanism has been proposed for the decomposition of O3(g) to O2(g): (1) O3
k1k 12? 2O2 O2 + O K = k1 / k?1 (2) O + O3 ??k (a) Derive a general expression for the rate law.
(b) To what simple expression does this rate law reduce if the first step is rate determining? (c) To what simple expression does this rate law reduce if the second step is rate determining? (d) How could you distinguish between the two?
3．(2 point) Suggest a structure for the S4(NH)4 molecule. Explain your reasoning.
4．(3 point) trans-Tetrazene (N4H4) consists of a chain of four nitrogen atoms with each of the two end atoms bonded to two hydrogen atoms. Use the concepts of steric number and hybridization to predict the overall geometry of the molecule. Give the expected structure of cis-tetrazene.
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