问题 选择题

各可逆反应达平衡后,改变反应条件,其变化趋势正确的是(  )

A.

B.

C.

D.

答案

A、CH3COOH溶液中加入CH3COONa固体,使CH3COOH溶液中CH3COO-浓度增加,电离平衡逆向移动,则c(H+)减小,pH逐渐增大,与图中不符合,故A错误;

B、因该反应中K+、Cl-实际不参加反应,则加入KCl对平衡体系无影响,化学平衡不移动,铁离子的浓度不变,与图中不符合,故B错误;

C、恒温恒压,加入Ar,各反应物的物质的量不变,体积变大,各物质的量浓度成倍减小(等效于减压),化学平衡朝体积增大方向移动,H2的改变量减小,

起始量不变,转化率减小,图中不符合,故C错误;

D、因反应为吸热反应,则体积、压强不变时,升高温度,平衡正向移动,则甲醚的转化率增大,与图中相符合,故D正确;

故选D.

阅读理解

British society is considered to be divided into three main groups of classes-the upper class,the middle class.and the lower or working class.This is known as the class system and it is important to know something about it if you mean to understand British people and society.Most British people grow up with a deep knowledge and understanding of the class system even if they are not very conscious(意识到的)of it.As a result,more people know which class they belong to and are able to tell which class other people come from by the way they speak,the kind of clothes they wear,their interests and hobbies or even the type of food they eat.

Social class is not only about behavior and attitudes.For example,although many upper class people are rich and may own a lot of land,having a lot of money does not necessarily make a person one member of the upper class.It is also important to come from a particular kind of family,have friends who are considered suitable,have been to a certain type of private school and speak with the right kind of accent.There are people who are poor but who do not think of themselves as working class because their family background,education,political opinions,etc.are basically different from those of most working-class people.Many people do not like the class system but it is impossible to pretend that these differences do not exist or that British people do not sometimes form opinions in this way.

小题1:The idea of the class system in Britain __________.

A.exists only in the mind of foreigners

B.is deeply rooted in the British people

C.is now under attack

D.is regarded as a long custom小题2:If an Englishman has a lot of money,__________.  

A.he belongs to the middle class

B.he must be a member of the upper class

C.he is not likely to be from the upper class

D.he may buy an upper class title with money小题3:What does the second paragraph mainly discuss?

A.Many rich people do not belong to the upper class.

B.Today many British people do not like the class system.

C.Many poor people do not consider themselves a lower class.

D.An Englishman’S social class is determined by many factors.小题4:What would be the best title for the passage?

A.An Unequal Society

B.Social Class in Britain

C.British People and Society

D.Information about Britain

问答题 简答题