问题 问答题

请你用已经掌握的实验室有关气体制取和净化等知识回答下列问题:

⑴写出上图中a、 b仪器名称:a             , b               。

⑵实验室用高锰酸钾制取氧气时,可选用的发生装置是      (填装置代号),若用C装置收集氧气,如何确定气体已经收集满               ,实验结束时的正确操作顺序为:先        后        ,写出该反应的化学方程式:                 。

⑶若用F装置收集O2,则O2应从导管口          (填“c”或“d”)通入。

⑷若用E装置收集某种气体,则该种气体应具备的性质是              ,试写出一个制取该种气体的化学方程式:                                  。

⑸某课外小组的同学用上图B装置使草酸分解并用如下装置探究草酸分解的产物:

①该装置中,A的作用是  ,C的作用是  , A、B   (填“能”或“不能”)互相交换。

②实验观察到A处无水硫酸铜变蓝,B和F处澄清石灰水都变浑浊,C处澄清石灰水无浑浊现象,E处黑色粉末变成红色,说明草酸分解的产物是                。

答案

⑴ 酒精灯  水槽

⑵ B  瓶口有气泡冒出时证明气体已收集满    把导管移出水面 熄灭酒精灯

2KMnO4K2MnO4 + MnO2 + O2↑        

⑶ c  

⑷ 密度比空气小       Zn + H2SO4 ="=" ZnSO4 + H2↑  (合理即可)

⑸① 检验产物是否有水     检验CO2是否已除尽  不能      

② H2O、CO2、CO

分析:(1)根据常见仪器的名称来回答;

(2)根据实验室制取氧气的常用装置及注意事项回答;

(3)根据收集气体的常用方法回答;

(4)根据向上排气法收集气体的性质回答;

(4)根据生成物的性质和所见实验现象回答.

解答:解:(1)仪器名称为:a:酒精灯;  b:水槽;

(2)实验室用高锰酸钾制取氧气时,应选“固固加热”型装置,故选B.判断排水法集满时只需要看集气瓶口是否有气泡冒出;为防止水倒吸到试管内,实验结束后应先从水槽中移出导气管,再停止加热;其反应的化学方程式为:2KMnO4K2MnO4+MnO2+O2↑;

(3)氧气的密度比空气大,所以收集时应从底进上出;

(4)用向上排空气法收集气体,该气体的密度应比空气轻,如氢气,其化学方程式为:2HCl+Zn=ZnCl2+H2↑;

(5)无水硫酸铜的作用是检验是否有水生成,若变蓝色就有水生成;C的作用是检验二氧化碳是否被B吸收完全;实验观察到A处无水硫酸铜变蓝,说明有水生成,B处澄清石灰水都变浑浊,说明有二氧化碳生成,C处澄清石灰水无混浊现象,E处黑色粉末变成红色,F处澄清石灰水都变浑浊,说明有一氧化碳生成;

故答案为:

(1)酒精灯;水槽;

(2)B;集气瓶口有气泡冒出;移出导气管;停止加热;

2KMnO4K2MnO4+MnO2+O2↑;

(3)c;

(4)密度比空气小;2HCl+Zn=ZnCl2+H2↑;

(5)①检验是否有水生成;检验二氧化碳是否被除净;②水、二氧化碳、一氧化碳.

阅读理解

In the past ten years, many scientists have studied the differences between men and women. And they all got the same answer: The sexes(性别) are different, because their brains are different. And this, the scientists say, makes men and women see the world in different ways.

Boys, for example, generally are better than girls at mathematical ideas. Boys also generally are better than girls at the kind of hand and eye movements necessary for ball sports. Girls, on the other hand generally start speaking earlier than boys. And they generally see better in the dark than boys and are better at learning foreign languages.

What makes men and women better at one thing or another? The answer is the brain. The brain has two sides connected by nerve(神经) tracks. The left side generally is used for mathematics, speech and writing. The right side is used for artistic creation(创造) and the expression for emotions(情感). In men and women, different areas in each side of the brain develop differently. In boys, for example, it’s the area used for mathematics. In girls, it is the area used for language skills. Another interesting difference is that the two sides of a man’s brain are connected by a smaller number of nerves than the two sides of a woman’s brain are.

小题1:Which of the following is the best title of the article?

A.Research on the Brain

B.Men and Women are Different in Brain

C.People’s Different Brains

D.Who Are Better, Boys or Girls小题2:__________ men and women think differently.

A.The different brains make

B.Sex makes

C.The different experiences make

D.The influences(影响) of society make小题3:According to the article, girls are generally better than boys at __________ in your school.

A.mathematics

B.physics

C.English

D.chemistry小题4:Which of the following is true?

A.The left side of brain in boys generally develops better than that in girls.

B.The left side of brain in girls generally develops better than that in boys.

C.Men are better than women in all things.

D.The area in girls used for language skills develops better.小题5:60. The number of nerves connecting the two sides of the brain in men __________.

A.is the same as women’s

B.is different from women’s

C.is larger than women’s

D.is twice as large as women’s

选择题