问题 填空题

(2011年广东,22题)下面是实验室制取和收集气体的装置,请按要求作答:

(1)仪器a的名称是________。

(2)用B装置制取气体并能随时停止反应,上部与下部对接应选_______(填“b”、“c”)。

(3)从装置A~D中选择:加热KMnO4制取O2并用排水法收集,应选用图中的________(填字母);实验室制取并收集CO2应选用图中的_______(填字母)。

(4)用装置E排空气收集H2,气体应从导管的________(填“d”、“e”)端进入;若制取O2用F装置排水收集,请将图F补画完整。

(5)右下图为制取H2并还原Fe3O4的微型实验装置,针筒与青霉素瓶组合部分相当于上图装置____ _______(填字母);检查此装置气密性的具体操作是___ ___________,若现象为_______ ________,则气密性良好。

答案

(1)酒精灯(2)c(3)AD;BC(4)e(5)B;将尖嘴导管插入水中,向后拉针筒活塞;水进入导管

分析:(1)熟记常用仪器的名称、连接、使用;

(2)用B装置制取气体并能随时停止反应,选择有带孔塑料片的;

(3)从装置A~D中选择:加热KMnO4制取O2并用排水法收集,根据反应需要加热和气体的气密性和水溶性,选择仪器装置;同理,实验室选择仪器装置,制取并收集CO2

(4)用装置E排空气收集H2,根据氢气的密度比空气的小,气体应从短管进,以便排净空气;若制取的O2用F装置排水收集,由短管进,以便排净水;

(5)如图为制取H2并还原Fe3O4的微型实验装置,针筒与青霉素瓶组合部分能控制反应速率,相当于上图装置装置B;了解检查此装置气密性的具体操作.

解答:解:(1)熟记常用仪器:仪器a的名称是酒精灯;

(2)用B装置制取气体并能随时停止反应,上部与下部对接应选择有带孔塑料片的c试管;

(3)从装置A~D中选择:加热KMnO4制取O2并用排水法收集,根据反应需要加热和气体的气密性和水溶性,应选用图中的A、D;同理,实验室制取并收集CO2应选用图中的B、C;

(4)用装置E排空气收集H2,根据氢气的密度比空气的小,气体应从导管的e端进入,以便排净空气;若制取的O2用F装置排水收集,则如图,以便排净瓶内水.

(5)如图为制取H2并还原Fe3O4的微型实验装置,针筒与青霉素瓶组合部分能控制反应速率,相当于上图装置装置B;检查此装置气密性的具体操作:用热水浸泡(或手握)青霉素瓶一会儿;若现象为针筒活塞略向左移动,则气密性良好.

故答为:(1)酒精灯;(2)c;(3)AD;BC;(4)e;

(5)B;用热水浸泡(或手握)青霉素瓶一会儿;针筒活塞略向左移动

单项选择题

Personality is to a large extent inherent. A-type parents usually (1) A-type offspring. But the environment must also have a profound effect (2) if competition is important to the parents, it is (3) to become a major factor in the lives of their children.

One place where children (4) A characteristics is school, which is, (5) its very nature, a highly competitive institution. Too many schools (6) the "win at all costs" moral standard and measure their success by sporting achievements. The current (7) for making children compete against their classmates or against the (8) produces a two-layer system, in which competitive A types seem in some way better than their B type fellows. Being too (9) to win can have dangerous consequences: remember that Pheidippides, the first marathon runner, (10) dead seconds after saying. "Rejoice, we conquer!"

(11) the worst form of competition in schools is the disproportionate emphasis on examinations. There is, for example, a (12) school that allows pupils to concentrate on those things they do well. The (13) of competition by examination are somewhat questionable, but competition in the certain (14) of failure is positively harmful.

(15) , it is neither practical nor desirable that all A youngsters change into B’s. The world needs types, and schools have an important duty to try to (16) a child’s personality to his possible future employment. It is top management.

If the preoccupation of schools with academic work was (17) , more time might be spent teaching children surer values. Perhaps selection (18) the caring professions, especially medicine, could be made less by good grades in chemistry and more by such (19) as sensitivity and sympathy. It is surely a mistake to choose our doctors exclusively from A type stock. B’s are important and should be (20) .

9()

A.liable

B.ready

C.keen

D.fond

单项选择题