山东大学 Phys ical Chemistry(2)课程试卷 2020-2021学年_Fa|学期 [1-10] At which conditions will the viscosity of a protein solution increase? d that the scattering intensity of this solution is times higher (B) In salting-out state, than the unknown one. Then the concentration of the unknown S sol is possibly of (C)Protein at its isoelectric point; (D)solution at higher temperature. 0.0125 mol dm 26] At certain conditions, the electrophoresis distance of serum(血清蛋白) varies with pH Il. Fill the blanks with the best answers(2 points for one question, Totally 22 Ax/cm 0.936 0.238 0.234 The isoelectric point is 4.51, At low pH, serum is tively/negatively) 密 [2-1]For polybutadiene rubber used in tire industry, what kind of light can cause aging( charged. 化)oft?428.76mm [2-2]Hg sol can be prepared by purging Hg vapor into dilute NaoH solution in which OH- 分■人 serving as stabilizer. The structure notation of the as-prepared Hg sol is__I(Hgho-nOH(n- Ill. Give brief answer to the following questions:(Totally 28 points) r)Na]"xNa If this Hg sol can be precipitated by 2 mmol dm"MgSO4, then the 3-11 [16 points] For I g hydrophilic adsorbent with micropores(ffL) its adsorpt precipitating value of MgClz isotherm for water at 298.2 K is shown in the following figure. It was found that Vm,I18.0 [2-3]In Cd-Ni battery, cd powder is used as the negative material and Ni( OOH) as the positive cm, Vm, 25.2 cm(STP). For water at 298.I K, the saturated pressure is 3. 168 kPa, pl is material with concentrated KOH solution serving as the electrolyte. Ni net is used as current 38 kPa, the surface tension is 71.94 mN m, and density is 0.997 g cm collector for both positive and negative electrodes. Please write the cell notation of this battery. ()[2 points] Please draw the corresponding desorption isotherm in the figure. Ni(s)Icd(s)I cd(oHhl KoH Ni(OH INi(ooH)INi(s) electrode reaction occurring on the positive plate during discharge. Ni(OOH)+H:O+ le -Ni(OH)+ OH- The theoretical electrochemical capacity of Ni(ooH)is 292.4 mAh g[Ni=S8.68: O=16.00, H-1.008]. The standard electrode potential of oe(Cd(OH)/Cd) is -0.783 V, oe(Cd*/Cdi-0403 V, the ksp of CH(OH) at 298.2K is 96500916883.6=2924mAhg [2-4]For a certain reaction A-P, its rate constant is 2.31x10-2s-l mol-l dm. If the initial/4)6 points] Please give explanation to the shape of adsorption isotherm by defining the concentration of A is 1.00 mol dm-3 then the half-life of the reaction is 43.29 s process corresponds to(), (2)and(3) [2-5] In order to determine the concentration of an unknown S sol, a student synthesized a s () monolayer adsorption; (2)capillary condensation; (3)surface liquidation. 第2页共3页2020-2021 学年 Fall 学期 [1-10] At which conditions will the viscosity of a protein solution increase? (A) In salting-in state; (B) In salting-out state; (C) Protein at its isoelectric point; (D) solution at higher temperature. 得分 阅卷人 II. Fill the blanks with the best answers (2 points for one question, Totally 22 points) [2-1] For polybutadiene rubber used in tire industry, what kind of light can cause aging (老 化) of it? ___ 428.76 nm ___. [2-2] Hg sol can be prepared by purging Hg vapor into dilute NaOH solution in which OH￾serving as stabilizer. The structure notation of the as-prepared Hg sol is ___ [(Hg)mnOH-  (n￾x)Na+ ] x- xNa+___. If this Hg sol can be precipitated by 2 mmol dm-3 MgSO4, then the precipitating value of MgCl2 _________ (>, <, =) 2 mmol dm-3 . [2-3] In Cd-Ni battery, Cd powder is used as the negative material and Ni(OOH) as the positive material with concentrated KOH solution serving as the electrolyte. Ni net is used as current collector for both positive and negative electrodes. Please write the cell notation of this battery. _Ni(s)Cd(s)Cd(OH)2KOHNi(OH)2Ni(OOH)Ni(s)______________. Write the electrode reaction occurring on the positive plate during discharge.__Ni(OOH) + H2O + 1e- ⎯→Ni(OH)2 + OH-_____. The theoretical electrochemical capacity of Ni(OOH) is 292.4__mAh g-1 .[Ni=58.68; O=16.00, H=1.008]. The standard electrode potential of (Cd(OH)2/Cd) is -0.783 V, (Cd2+/Cd)=-0.403 V, the ksp of Cd(OH)2 at 298.2K is __1.42×10-13________. (96500/91.688)/3.6 = 292.4 mAh g-1 [2-4] For a certain reaction A⎯→P, its rate constant is 2.3110-2 s -1 mol-1 dm3 . If the initial concentration of A is 1.00 mol dm-3 , then the half-life of the reaction is __43.29 s_____. [2-5] In order to determine the concentration of an unknown S sol, a student synthesized a S sol of 0.1 mol dm-3 , and found that the scattering intensity of this solution is 8 times higher than the unknown one. Then the concentration of the unknown S sol is possibly of _0.0125___ mol dm-3 . [2-6] At certain conditions, the electrophoresis distance of serum (血清蛋白) varies with pH pH 3.76 4.20 4.82 5.58 x/cm 0.936 0.238 0.234 0.710 The isoelectric point is __4.51__. At low pH, serum is _______(positively/negatively) charged. 得分 阅卷人 III. Give brief answer to the following questions: (Totally 28 points) [3-1] [16 points] For 1 g hydrophilic adsorbent with micropores (微孔), its adsorption isotherm for water at 298.2 K is shown in the following figure. It was found that Vm, 1= 18.0 cm3 , Vm, 2= 25.2 cm3 (STP). For water at 298.1 K, the saturated pressure is 3.168 kPa, p1 is 2.338 kPa, the surface tension is 71.94 mN m-1 , and density is 0.997 g cm-3 . (1) [2 points] Please draw the corresponding desorption isotherm in the figure. (2)[6 points] Please give explanation to the shape of adsorption isotherm by defining the process corresponds to (1), (2) and (3). (1) monolayer adsorption; (2) capillary condensation; (3) surface liquidation. 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 3 页