问题 实验题

根据如下所示实验装置图回答(填代号):

(1)写出图中注有编号的仪器名称:①_______ ,②_______ ,③_______ ,④_______

(2)实验室用高锰酸钾制取氧气时,应选用的发生装置是______.实验时应注意:①实验前要检查装置的______性; ②试管口要塞一小团棉花,其目的是________________________; ③当用排水法收集好气体停止加热时,先要_________,然后再_________,其目的是_________________.

(3)实验室制取二氧化碳时,应选用的发生装置是______,收集装置是______,长颈漏斗末端管口要伸入液面下的原因是________________ .写出该反应的文字表达式(注上化学式):________________________________________

答案

(1)酒精灯;铁架台;长颈漏斗;集气瓶.

(2)A;①气密性;②防止加热过程中高锰酸钾进入导管;③撤出导管;熄灭酒精灯;防止水倒流入试管,引起试管炸裂.

(3)B;D;防止生成的气体逸出;大理石+稀盐酸=氯化钙+水+二氧化碳(CaCO3 +2HCl=CaCl2 +H2O+CO2↑).

单项选择题 A3型题
阅读理解

Pressure too much?

In our daily life we are used to hearing these words, “I can't wait for my holiday,” “I wish I could stay home today” And “I'm very tired.” These words come from pressure at work. Now the “iron rice bowl”(铁饭碗) is being broken into pieces. Workers may be fired if they don’t perform their duties well. They have to do their jobs better.

People feel pressure not only because they might find themselves out of work but also because they get no real pleasure from their work. For most of the workers, work is just a way of earning money. It appears to be meaningless and worthless.

But pressure is a natural part of work. There is no way to keep away from it. We should face up to it.

Work should be a cause of happiness and pride rather than a punishment or a burden .In fact, a certain amount of pressure can provide challenge and chance for learning. To a modern man who is worried and low in spirit, developing a hobby and finding a new interest is of first importance. I like listening to pop music, which makes me calm and gives me pleasure.

If pressure becomes difficult to deal with, we should turn to our friends or families. We can have a drink with our friends and talk about the problem. We should always discuss our problems with our families. Good advice, warmth and happiness that families bring to us can reduce our pressure and encourage us to smooth away all difficulties.

小题1:Peopel feel pressure at work mainly because ______.

A.they will lose their jobs

B.most of them find less interest in their work

C.they can make more money after work.

D.they want to stay at home.小题2:Which of the following is WRONG in the writer’s opinion?

A.Where there is work there is pressure.

B.Work shouldn’t be regarded as punishment or burden.

C.All modern men are worried and low in spirit.

D.A certain amount of pressure is necessary.小题3:From the text we can know that when pressure is too big, ________.

A.we should drink coffee with our friends

B.we can get help and comfort from our friends or families.

C.we can go home because it is warm

D.to talk out the problem to our friends and families is the best way.