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单选题 在Zn电极上H2的过电势是0.75V,现电解一含Zn2+的浓度为10-5mol/dm的溶液,为了不使 H2析出,问溶液的pH值应控制在多少才行?已知φ⊖(Zn2+/Zn)=-0.763V
学科：物理化学
时间：2023-12-11 12:21:50
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题目1单选题
在 298K 时,试从标准生成自由能计算下述电池的电动势:Ag(s)│AgCl(s)│NaCl(a=1)│Hg2Cl2(s)│Hg(l)已知 AgCl(s) 和 Hg2Cl2(s)的标准生成自由能分别为-109.57和-210.35 kJ·mol-1A. -0.04554 VB. 1.0445 VC. 0.04554 VD. -1.0445 V
题目2单选题
某电导池内装有两个面积均为3.20cm2的互相平行的银电极.两极之间的距离为10.00cm,今在该电导池内装满0.02mol/dm的AgNO3溶液,施加30伏的电压,测得电流强度为0.022安培,试计算该溶液的电导G,电导率k,摩尔电导率A. 1363.6 S,0.229 S/m,2.13×104 S·m2·mol-1B. 7.33×10-4 S,2.347×10-7 S/m,1.173×10-8 S·m2·mol-1C. 1363.6 S,4.26×105 S/m,2.13×104 S·m2·mol-1D. 7.33×10-4 S,0.229 S/m,0.01145 S·m2·mol-1
题目3单选题
25℃时,电池 H2(p)|HCl(m)|AgCl-Ag;当p为101325Pa,mB=0.1mol/Kg,γ±=0.798时,测得E=0.3522V,计算:反应H2(g)+2AgCl=2Ag+ 2HCl(0.1m)的平衡常数A. 3.32×107B. 2.08×1014C. 17.3D. 1.12×107
题目4单选题
在Zn电极上H2的过电势是0.75V,现电解一含Zn2+的浓度为10-5mol/dm的溶液,为了不使 H2析出,问溶液的pH值应控制在多少才行?已知φ⊖(Zn2+/Zn)=-0.763VA. 11.28B. 1.32C. 2.72D. 12.68
题目5单选题
试根据下列反应设计一个原电池:Cu(s)+Cl2 (p=1atm) = Cu2+(a=1)+2Cl-(a=1)A. Cu(s)|CuCl2|Cl2|PtB. Pt|Cl2|CuCl2|Cu(s)C. Cu(s)|Cu2+(a=1)|Cl-(a=1)|Cl2|PtD. Pt|Cl2|Cl-(a=1)|Cu2+(a=1)|Cu(s)
题目6单选题
Cr和Fe同时沉积就能进行不锈钢电镀.(1)若 Cr2+的浓度为1mol/kg,则Fe2+的浓度为多少?假定两个电极都不考虑超电势.(2)若电解 Cr2+浓度 2.5mol/kg,Fe2+浓度 0.5mol/kg的混和液,假定 Cr 没有超电势,计算 Fe 析出的超电势.已知:φ⊖(Cr2+/ Cr)=-0.56V,φ⊖(Fe2+/Fe)=-0.44VA. 4.32×10-5mol/kg,0.10VB. 8.83×10-5mol/kg,0.20VC. 4.32×10-5mol/kg,0.20VD. 8.83×10-5mol/kg,0.10V
题目7单选题
用 Debye-Huckel 极限公式计算 298K 时 0.002mol·kg-1的CaCl2的平均活度系数.已知:A=0.509 (mol·kg-1)-0.5A. 0.7885B. 0.8339C. 0.9132D. 0.6955
题目8单选题
电池 Hg│Hg2Br2(s)│Br-│AgBr(s)│Ag 在p⊖下25℃附近时,该电池电动势与温度的关系是:E/V=0.06804+0.312×10-3(T-298).写出通过1F电量时电极反应与电池反应【在上传扫描件上完成】,求算在p⊖和25℃时该电池反应的ΔrGm、ΔrHm、ΔrSm,若通过2F电量则电池作电功为多少?A. -6.566 kJ/mol,30.108 kJ/K/mol,2412.5 J/K/mol,-13.13kJ/molB. 6.566 kJ/mol,30.108 J/K/mol,2412.5 J/K/mol,-13.13kJ/molC. -6.566 kJ/mol,30.108 J/K/mol,2412.5 J/K/mol,-13.13kJ/molD. -6.566 kJ/mol,30.108 J/K/mol,2412.5 J/K/mol,13.13kJ/mol
题目9填空题
选词填空 (请填写正确答案序号) Directions: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank. You may not use any of the words in the bank more than once. Do you dream of taking each day as it comes? Are you ready, as a new college graduate, to (1) down with a job you'll stick to for years? How would you like a solo adventure abroad instead? If you worry you've had very little money (2) up, why not consider a working holiday? Sightseeing and meeting new people sound really exciting, right? Quickly (3) with shooting photos and videos around? Yes, to (4) amazing scenes and memorable moments! For once, you don't have to think about the job market at home. Nonetheless, you'd better be forewarned. The idea of taking a working holiday abroad may mean uncertainty and anxiety as a result of stepping outside your comfort zone. For example, you won't have the (5) support readily available from your family and friends. People you will meet daily don't speak your language and may not (6) the same cultural beliefs as yours. Besides, in the first few days you have no (7) how to find a job and end up (8) out. So here are the tips: Going on (9) first to find friends who've been in the country longer than you and who can recommend you to their previous workplace. Using a working holiday program (10) to your arrival that helps you find a job, get a tax number, open a bank account, and more. Looking for work classifieds on street posts, your hostel job board and online job boards like GumTree. A.awkward B. browse C. capture D. clue E. embrace F. emotional G. excursions H. obsessed I. prior J. remainder K. saved L. settle M. stressed N. tackled O. versions题目10填空题
选词填空 (请填写正确答案序号) 方向:在本节中,有一段有十个空白的段落.您需要从单词库中给出的选项列表中为每个空白选择一个单词.您不得多次使用银行中的任何词语. 你梦想着过好每一天吗?作为一名应届大学毕业生,你准备好了(1) 放弃一份你会坚持多年的工作了吗?你希望独自出国冒险吗?如果你担心你的钱 很少(2), 为什么不考虑打工度假呢? 观光和结识新朋友听起来真的很令人兴奋,对吧?快速 (3) 拍摄照片和视频?是的,( 4) 令人惊叹的场景和难忘的时刻!这一次,您不必考虑国内的就业市场.尽管如此,你最好事先得到警告.在国外打工度假的想法可能意味着走出舒适区会带来不确定性和焦虑.例如,您不会 从家人和朋友那里获得 (5) 支持.你每天会遇到的人不会说你的语言,也可能 (6) 与你的文化信仰不同.此外,在最初的几天里,你没有 (7) 如何找到工作并最终 (8) 出局.所以这里有一些提示: 首先要(9)找到比你在这个国家呆得更久的朋友,他们可以把你推荐到他们以前的工作场所. 在抵达时使用打工度假计划 (10), 帮助您找到工作、获得税号、开设银行账户等. 在街头帖子、您的宿舍工作委员会和 GumTree 等在线工作委员会上寻找工作分类广告. A.笨拙 B.浏览 C.捕捉 D.线索 E.拥抱 F.情感 G.短途旅行 H.痴迷 I.先行 J.余下 K.保存 L.安顿 M.强调 N.处理 O.版本下载 题海APP
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