问题 问答题

根据下图所示实验装置回答有关问题.

(1)写出标有序号的仪器名称:①______,②______.

(2)实验室用过氧化氢溶液和二氧化锰制取氧气的化学方程式______.

(3)实验室制取二氧化碳气体,其反应的化学方程式为______,应选择的发生装置为______(填写装置的字母代码,下同),收集装置为______,检验二氧化碳是否收集满的方法是______.

答案

(1)依据常见仪器的认识可知:仪器①是试管②是长颈漏斗.

(2)二氧化锰制取氧气时二氧化锰做催化剂,产物是水与氧气,然后利用对化学方程式书写的要求书写出化学方程式,要注意条件和生成物状态的标注.

(3)实验室用稀盐酸与碳酸钙的反应制取二氧化碳,是固液制气不需加热,制气装置应选择B,由于二氧化碳密度比空气大且能溶于水,所以收集装置要用向上排空气法.

故答案为:(1)试管;长颈漏斗(2)2H2O2

 MnO2 
.
 
2H2O+O2↑(3)CaCO3+2HCl=CaCl2+CO2↑+H2O;用燃着的木条伸到集器瓶口进行检验,熄灭即满.

完形填空

阅读下面短文,根据短文内容用完整的句子回答问题。(请将答案写在答题卷上相应番号后的横线上)。(共5小题;每小题2分,满分10分)

You will probably try harder to get more sleep once you see how much better you feel with even 30 minutes more sleep.

Getting more sleep is sometimes merely a matter of scheduling. In the next couple of weeks, try to get rid of one or two things from your morning and evening routine. If morning is your downfall, shift(转移) some of your morning routines to the night before or putting something off until your break at lunch. If late afternoon and night are your downfalls, do the same.

You don’t really need to watch the news. It’s depressing. If something important happens today, you will find out tomorrow at work. At least skip(略过) the weather. Right after dinner, go to a major search engine, and type in “national weather” and the name of your town. You will see a two-line weather report from the National Weather Service. This will save you several minutes of watching the weather on television.

If reading helps you, take a boring book or magazine to bed with you. Paperbacks(平装本) are not as heavy and are easier to read in bed. 

If you have a partner or roommate, maybe you can take turns with a neck and shoulder massage at night instead of television.

Make sure you are ready for sleep when you go to bed. __________ such as televisions, computers, and video games wake us up. Avoid them for at least an hour before you plan to go to bed. 

小题1:What is the best title of the passage? (Please answer within 10 words.)

小题2:Please fill in the blank in the last paragraph with proper words or phrases to complete the sentence. (Please answer within 5 words.)

小题3:Which sentence in the passage can be replaced by the following one?

Often, sleeping more depends on how you manage your time.

小题4:Translate the underlined sentence in the fourth paragraph into Chinese.

小题5:As a senior student, how can you make sure you get enough sleep?  (Please answer within  30 words.)

单项选择题