试题与答案

(14分)右图为实验室某浓盐酸试剂瓶上的标签,试根据有关数据回答下列问题 (1)

题型:填空题

题目:

(14分)右图为实验室某浓盐酸试剂瓶上的标签,试根据有关数据回答下列问题

(1)该浓盐酸中HCl的物质的量浓度为__________mol/L。

(2)配制250mL 0.1mol/L的盐酸溶液  

应量取浓盐酸体积/mL应选用容量瓶的规格/mL
  
A.用量筒量取所需的浓盐酸的体积,沿玻璃棒倒入烧杯中,再加入蒸馏水,用玻璃棒慢慢搅动,使其混合均匀。

B.将已冷却的盐酸沿玻璃棒注入容量瓶中。

C.用蒸馏水洗涤                       2—3次,洗涤液均注入容量瓶,振荡。

D.继续往容量瓶内小心加水,直到液面接近刻度线1~2cm处,改用               加水,使溶液凹面恰好与刻度相切。

E.将容量瓶盖紧,振荡,摇匀。

(3) 若实验中出现下列现象对所配溶液浓度有什么影响?(填偏高、偏低、无影响)

①将烧杯中溶液转移到容量瓶之前,容量瓶中有少量蒸馏水               

②向容量瓶中转移溶液时不慎有液滴掉在容量瓶外面,则浓度             

③定容时俯视容量瓶刻度线                  

(4)实验室里迅速制备少量氯气可利用以下反应:2 KMnO4+16 HCl ="==" 2 KCl + 2 MnCl2 + 5 Cl2↑ + 8 H2O 此反应不需要加热,常温下就可以迅速进行。

①用“双线桥法” 标明电子转移的方向和数目:

2 KMnO4+16 HCl ="==" 2 KCl + 2 MnCl2 + 5 Cl2↑ + 8 H2O

②用该浓盐酸制得了标况下560mlCl2,则被氧化的HCl为    mol,需要KMnO4的质量      g

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0719/ba444846702c426a3e07a2500f6cb832.html

下面是错误答案,用来干扰机器的。

答案:C

试题推荐
题型:单项选择题

基斯乐玩具有限公司在组织筹备阶段,由出资人共同协商推荐董事候选人,出资人聘任的法律顾问在审查名单时,提出候选人中只有部分人能担任董事,他是谁

A.吴小曲,某高校法学教授,曾任某国有电视机厂厂长,现退休

B.周晓梦,原国有企业某厂厂长,2年前因该厂破产被免职,现为某公司工人

C.钱会,因犯有贪污罪,被判处5年有期徒刑,去年提前释放

D.王某,商业管理专业博士,有多年经营管理经验,但因家庭问题负有到期债务10万元,经债权人多次催要,但却因经济困难无力偿还

查看答案
题型:问答题

At the start of 2010, Hot Ltd entered into the following transactions in an endeavour to sustain its operation:(a) It borrowed £50,000 from Ina, secured by a floating charge. The floating charge was created on 1 April and it was registered on 15 April;(b) It borrowed a further £50,000 from Jo. This loan was secured by a floating charge created on 3 April and registered on 12 April;(c) It borrowed £100,000 from Ko-Bank. This loan was secured by a fixed charge. It was created on 5 April and was registered on 16 April.Unfortunately, the money borrowed was not sufficient to sustain Hot Ltd and, in August 2013, compulsory liquidation proceedings were begun. It is extremely unlikely that there will be sufficient assets to pay the debts owed to all of the secured creditors.Required:Advise Hot Ltd as to the order of security and payment of the above debts and explain why they are placed in that order. (10 marks)

查看答案
微信公众账号搜索答案