山东大学：《物理化学》课程教学资源（讲义资料）2020-2021 Third Quarter-exam paper-with answers

山东大学 Physical Chemistry(2)课程试卷 20202021学年_Fal|学期 号国國五六[七九团十分分人 分■人 2020-2021 Academic Year Fall Semester IL Fill the blanks with the best answers (5 points of each question, totally Third Quarter of Physical Chemistry(2) [2-1]For capillary with radius Ri and R2 made from the same material, water can rise to hI 舞分[人 and hl, respectively, as shown in Fig.(a)as the standard. l. Choose the best answer for the following questions (5 points for each (2) If we first make water to rise to a height higher than hI, and then let these capillaries question, totally 25 points) r-l During dialysis, the electrodynamic potential (4) of Fe(OH) colloidal i free, in which capillaries will the water attain h? c, d increasing the dialysis time () If we plug capillary more into the water surface, the water in which can rise to a (A)decreases, (B) increases, (C)keep unchanged; (D) first increases and then [1-2] For salting-out of protein, which of the following electrolyte is more suitable? A)LiCl; (B)KCl; (C)(NH42SO4; (D)NH4NO3 封 [-3] To purify water from Yellow River, the following electrolytes is usually used, which is the most powerful and with least pollution? [Hint: dissoluble salt is pollutant difficult to (A)FeCl]; (B) MgSO4, (C)KAl(SO4)12H20: (D) polysilicate aluminum 2-2]For dropping mercury electrode(DME), when the electrode is negatively charged, [1-4] At 293 K, the surface tension of water, mercury and water/mercury interface is 72.8, ropping rat at the same liquid pressure 483.0 and 375.0 mN m-I. What statement is correct? (increases/decreases/keeps unchanged) 22-3] When we purge SOz gas into 2S solution, S sol with light yellow color can be (B) water cannot spread over Hg, (C)No definite conclusion can be reached; (D) Hg is hydrophobic. obtained. Write the equation for this preparation 2HiS+ SO2-3S(sol)+ 2H20. If HS serves as stabilizer, write the notation of this colloid. [1-5] For the distance to define the thickness of compact layer of electric double layer(d1) San(HS )(n-x)H'TxH+ and the distance to define slide plane for electrodynamic potential (d), c du (A)>,(B)<(C)=,(D)uncertain [2-4] For a surfactant with large hydrophilic head and small hydrophobic tail, it benefits the formation emulsion (OWW, W/O; uncertain) 1-6 CH:OH decomposes on ZnO/AlzO; catalyst forming CO and Hz, the process can be[2-5]At 293.2 K, the saturated pressure of water is 2.338 kPa. If we want water of 70% expressed as CH3 OH+M= CH:OH-M(0)+C0+2H2+M. At high pressure, the. to condense in a capillary, the diameter of this capillary is_6.0_.The surface tension of water is 72.8 mN m-l, density is 0.998x10 kg m, assuming complete wettable (A)first order;(B)second order; (C)zero order; (D)without definite order 第 页共2页

题号 一 二 三 四 五 六 七 八 九 十 总分 总分人 得分 2020-2021 Academic Year Fall Semester Third Quarter of Physical Chemistry (2) ---------------------------------------------------------------------------------------------- 得分 阅卷人 1. Choose the best answer for the following questions (5 points for each question, totally 25 points) [1-1] During dialysis, the electrodynamic potential () of Fe(OH)3 colloidal will ____ with increasing the dialysis time (A) decreases; (B) increases; (C) keep unchanged; (D) first increases and then decreases. [1-2] For salting-out of protein, which of the following electrolyte is more suitable? (A) LiCl; (B) KCl; (C) (NH4)2SO4; (D) NH4NO3 [1-3] To purify water from Yellow River, the following electrolytes is usually used, which is the most powerful and with least pollution? [Hint: dissoluble salt is pollutant difficult to handle] (A) FeCl3; (B) MgSO4; (C) KAl(SO4)12H2O; (D) polysilicate aluminum. [1-4] At 293 K, the surface tension of water, mercury and water/mercury interface is 72.8, 483.0, and 375.0 mN m-1 . What statement is correct? (A) Water can spread over Hg; (B) water cannot spread over Hg; (C) No definite conclusion can be reached; (D) Hg is hydrophobic. [1-5] For the distance to define the thickness of compact layer of electric double layer (d1) and the distance to define slide plane for electrodynamic potential (d2), d2___ d1 (A) >; (B) <; (C) =; (D) uncertain. [1-6] CH3OH decomposes on ZnO/Al2O3 catalyst forming CO and H2, the process can be expressed as CH3OH + M CH3OH⎯M() ⎯→ CO + 2H2 +M. At high pressure, the apparent reaction order is (A) first order; (B) second order; (C) zero order; (D) without definite order. 得分 阅卷人 II. Fill the blanks with the best answers (5 points of each question, totally 35 points) [2-1] For capillary with radius R1 and R2 made from the same material, water can rise to h1 and h1, respectively, as shown in Fig. (a) as the standard. (1) In which capillary can water rise to h1? ___c_____; (2) If we first make water to rise to a height higher than h1, and then let these capillaries free, in which capillaries will the water attain h1? ___c, d_________; (3) If we plug capillary more into the water surface, the water in which can rise to a more height? __d____. [2-2] For dropping mercury electrode (DME), when the electrode is negatively charged, the dropping rate will ___________ at the same liquid pressure (increases/decreases/keeps unchanged) [2-3] When we purge SO2 gas into dilute H2S solution, S sol with light yellow color can be obtained. Write the equation for this preparation _2H2S+ SO2_⎯→ 3S (sol) + 2H2O____. If HS￾serves as stabilizer, write the notation of this colloid. __[Smn(HS- )(n-x)H+ ] x- xH+_________________. [2-4] For a surfactant with large hydrophilic head and small hydrophobic tail, it benefits the formation of _____________________ emulsion. (O/W; W/O; uncertain) [2-5] At 293.2 K, the saturated pressure of water is 2.338 kPa. If we want water of 70% R.H. to condense in a capillary, the diameter of this capillary is _6.0 nm___. The surface tension of water is 72.8 mN m-1 , density is 0.998103 kg m-3 , assuming complete wettable. 山东大学 Physical Chemistry (2) 课程试卷 学院 专业 级 学号 姓名 … … … … … … … … … … … … … … 密 … … … … … … … … … … 封 … … … … … … … … … … 线 … … … … … … … … … … … … … 第 1 页 共 2 页 2020-2021 学年 Fall 学期

山东大学 Physica| Chemistry(2)课程试卷 2018-2019学年Fa|学期 舞分[舞 分L Ill Give brief answer to the following questions:Totally 20 points) IV Calculation(totally 20 points): 13-1)(12 points)NHs can decompose on metal catalyst for preparation of hydrogen for +-1[12 points)At 298 K, the dependence of surface tension of alcohol solution on molarity industry use. The decomposition rate law is found to be r=k PNh concentration(mol dm")isa(mN m")=728-0.5c (I) Calculate the surface cohol on the solution surface when cao.6 mol dm (1)14 points] Please give explanation to this fact based the competing adsorption of NHs and Ta-c(da)=1.46x10-5mol m2 Ha on the catalyst. (2)[4 points] Compare the adsorption coefficient of NHs and H2 on the catalyst surface (2)Calculate the capillary rise of this solution in a glass capillary of 10-m in (3)(4 points] explain the changing tendency of the order of the reaction. Assuming complete wettable and the density of solution of 0.986x10 kg m3, (1) 2)The adsorption coefficient of Hz is much stronger than that of NH3. (3)Change from l-order to no definite order to o-order (3)At what concentration will the surface excess of alcohol attain the maximum. 13-21(8 pints) It was found that the diffusion coeficient(D)of Fe(OH) colloidal particle is The maximum cannot be reached. about 1000 times less than Fel cation, but their mobilities (U) are close. Please give[1-2)(8 poins] For a colloidal particle of 4.2 nm in diameter, at 2981I K, the viscosity of 封 quantitative or semiquantitative explanation to these facts. the dispersion medium is r-0 00I Pa s. (1)The diffusion of Fe(OH)s colloidal particle is due to Brownian motion(the random (1)Calculate the diffusion coefficient of the colloidal particle, collision of water molecules), according to Einstein-Brownian diffusion law D=RT_,its RT= radius is about 1000 times larger than that of Fe". (2) Due to Brownian motion, what distance does this particle diffuse in one second? (2)For electric transfer, U-25,E2 tatic force exerted on tI x=√2D=1.02×105m colloidal particle is ca. 1000 times larger than Fe. 第2页共2页

得分 阅卷人 III. Give brief answer to the following questions: (Totally 20 points) [3-1] [12 points] NH3 can decompose on metal catalyst for preparation of hydrogen for industry use. The decomposition rate law is found to be 3 2 NH H p r k p = . (1) [4 points] Please give explanation to this fact based the competing adsorption of NH3 and H2 on the catalyst. (2) [4 points] Compare the adsorption coefficient of NH3 and H2 on the catalyst surface. (3) [4 points] explain the changing tendency of the order of the reaction. (1) 3 3 3 3 2 2 NH NH NH NH H H 1 b p r k b p b p = + + means H H NH NH 2 2 3 3 b p b p  +1 , (2) The adsorption coefficient of H2 is much stronger than that of NH3. (3) Change from 1-order to no definite order to 0-order. [3-2] [8 pints] It was found that the diffusion coefficient (D) of Fe(OH)3 colloidal particle is about 1000 times less than Fe3+ cation, but their mobilities (U) are close. Please give quantitative or semiquantitative explanation to these facts. (1) The diffusion of Fe(OH)3 colloidal particle is due to Brownian motion (the random collision of water molecules), according to Einstein-Brownian diffusion law 6 RT D r = , its radius is about 1000 times larger than that of Fe3+ . (2) For electric transfer, r 0 2 3 U     = , the electrostatic force exerted on the colloidal particle is ca. 1000 times larger than Fe3+ . , 得分 阅卷人 IV. Calculation (totally 20 points): 4-1 [12 points] At 298 K, the dependence of surface tension of alcohol solution on molarity concentration c (mol dm-3 ) is 1 (mN m ) 72.8 0.5c − = − . (1) Calculate the surface excess of alcohol on the solution surface when c = 0.6 mol dm-3 . p c d RT dc     = −     =1.4610-5 mol m-2 (2) Calculate the capillary rise of this solution in a glass capillary of 10-3 m in radius. Assuming complete wettable and the density of solution of 0.986103 kg m-3 , gravity acceleration g = 9.80 N kg-1 . 2 cos h gR    = =1.50 cm (3) At what concentration will the surface excess of alcohol attain the maximum. The maximum cannot be reached. [4-2] [8 poins] For a colloidal particle of 4.2 nm in diameter, at 298.1 K, the viscosity of the dispersion medium is =0.001 Pa s. (1)Calculate the diffusion coefficient of the colloidal particle; 6 RT D r = =5.210-11 m2 s -1 (2) Due to Brownian motion, what distance does this particle diffuse in one second? x Dt = 2 =1.0210-5 m 山东大学 Physical Chemistry (2) 课程试卷 学院 专业 级 学号 姓名 … … … … … … … … … … … … … … 密 … … … … … … … … … … 封 … … … … … … … … … … 线 … … … … … … … … … … … … … 第 2 页 共 2 页 2018-2019 学年 Fall 学期