问题 填空题

某化学兴趣小组为探究SO2的性质,按下图所示装置进行实验。

请到答F列问题:

(1)装置A中盛放亚硫酸钠的仪器名称是             ,其中发生反应的化学方程式为           

(2)实验过程中,装置B、C中发生的现象分别是                    ,这些现象分别说明SO2具有的性质是                   ;装置B中发生反应的离子方程式为                 

(3)装置D的目的是探究SO2与品红作用的可逆性,请写出实验操作及现象                  

(4)尾气可采用            溶液吸收。

答案

(1)蒸馏烧瓶   Na2SO3+H2SO4(浓)= Na2SO4+ H2O+SO 2

(2)溶液由紫红色变为无色 无色溶液中出现黄色浑浊 

还原性  氧化性    5SO2 + MnO4- + 2H2O = 2Mn2+ + 5SO42- + 4H+

(3)品红溶液褪色后,关闭分液漏斗的旋塞,点燃酒精灯加热,溶液恢复为红色

(4)NaOH

题目分析:该实验为制备SO2并检验其性质,则A为SO2的发生装置,B、C、D为检验装置;B中为酸性高锰酸钾溶液。它具有强氧化性能把SO2氧化成H2SO4,它本身被还原为Mn2+,溶液的紫色变浅或褪去。故可用于检验SO2的还原性;C中为硫化钠溶液,其具有强还原性二者发生反应产生难溶于水的S单质,看见溶液变浑浊,故可用于检验SO2的氧化性;D中为品红溶液,可检验SO2的漂白性;SO2的漂白是结合漂白,产生的无色物质不稳定,受热容易分解而恢复原来的红色。SO2是大气污染物,它是酸性氧化物,可用碱性溶液NaOH来消除其危害。2的实验室制法及性质的检验。

单项选择题
阅读理解

阅读理解。

    Someday a stranger will read your email without your permission or scan the websites you've

visited. Or perhaps someone will casually glance through your credit card purchases or cell phone

bills to find out your shopping preferences or calling habits.

    In fact, it's likely some of these things have already happened to you. Who would watch you

without your permission? It might be a girlfriend, a marketing company, a boss, a policeman or a

criminal. Whoever it is, they will see you in a way you never intended to be seen-the 21st century

equal to being caught naked(裸露的).

    Psychologists tell us boundaries are healthy, though it's important to reveal(透露) yourself to

friends, family and lovers in stages, at appropriate times. Actually few boundaries remain.

The digital breadcrumbs(面包屑) you leave everywhere make it easy for strangers to reconstruct

who you are, where you are and what you like. In some cases, a simple Google search can reveal

what you think, like it or not, increasingly we live_in_a world where you simply cannot keep a secret.

    The key question is:Does that matter? For many Americans, the answer apparently is "no".

    When opinion polls ask Americans about privacy, most say they are concerned about losing it.

A survey found a majority of people are pessimistic about privacy, with 60 percent of respondents

saying they feel their privacy is "slipping away, and that bothers me".

    But people say one thing and do another.  Only a small part of Americans change any  behaviors

in an effort to preserve their privacy. Few people turn down a discount at tollbooths(收费亭) to avoid

using the EZPass system that can track(跟踪) automobile movements. And few turn down supermarket

loyalty cards. Privacy economist Alessandro Acquits has run a series of tests that reveal people will

submit personal information like Social Security numbers just to get their hands on a pitiful 50centsoff

coupon(优惠券).

     But privacy does matter-at least sometimes. It's like health; when you have it, you don't notice it.

     Only when it's gone do you wish you'd done more to protect it.

1. What would psychologists advise on the relationships between friends?

A. There should be a distance even between friends.

B. There should be fewer quarrels between friends.

C. Friends should always be faithful to each other.

D. Friends should open their hearts to each other.

2. Why does the author say "we live in a world where you simply cannot keep a secret"?

A. There are always people who are curious about others' affairs.

B. Many search engines profit by revealing people's identities.

C. People leave traces around when using modern technology.

D. Modern society has finally developed into an open society.

3. What do most Americans do with regard to privacy protection?

A. They change behaviors that might disclose their identity.

B. They talk a lot but hardly do anything about it.

C. They rely more and more on electronic equipment.

D. They use various loyalty cards for business deals.

4. According to the passage, privacy is like health in that________.

A. its importance is rarely understood

B. it is something that can easily be lost

C. people will make every effort to keep it

D. people don't treasure it until they lose it