问题 实验题

实验室提供如图所示的仪器:   

(1)仪器④的名称是____,请你写出该仪器的一种用途____.   

(2)实验室欲用上述仪器完成高锰酸钾制取氧气的实验,需要用到的仪器有(填仪器序号)____,装配制取装置时还须补充的一种用品是____.某同学用该方法制取一集气瓶氧气后经检测发现,它并不能使带火星的木条复燃,老师说他收集的氧气浓度太低,请帮他分析可能的原因:  ①________________;    ②________________.   

(3)实验室欲利用上述仪器中的③⑦⑨作制氧气的发生装置,应使用的药品是____和____,其中____起催化作用,反应的文字表达式是____.   

(4)氨气(NH3)在通常情况下是一种无色有刺激性气味的气体,密度比空气的小,极易溶于水,水溶液称为氨水.实验室常用加热氯化铵和熟石灰两种固体的混合物来制取氨气.实验室制氨气应选用上述仪器中的(填仪器序号)____作发生装置,收集氨气应采用____方法,收集满氨气的集气瓶应____放在桌子上.

答案

(1)烧杯 ; 配制溶液(或作大量试剂的反应容器等)  

(2)①②⑤⑥⑧ ;棉花  

①装置气密性不严 ;②过早开始收集气体(或用排水法收集时集气瓶内水未装满,或其它合理答案)

(3)过氧化氢 ;二氧化锰 ;二氧化锰 ;  

(4)①②⑤⑩ ; 用向下排空气 ;倒

填空题
阅读理解

Long ago, in days of the Roman Empire, people used to believe a god of farmings called “Saturn”. They believed that Saturn could make the weather good or bad, and that he had the power to control how much rain would fall.

Before a Roman farmer would plant his fields, he would try to get Saturn to give him good weather. He believed that if he killed an animal for Saturn, that would make Saturn happy. Then Saturn would make sure that the weather was good.

Not only did the people name a planet after Saturn but they also name a day of the week after him. They called this day “Saturni dies”, Latin words which mean “day of Saturn”. In English those words became Saturday.

6. What was Saturn believed to be in charge of?

A. Rainfall.    B. The power of nature.   C. Farming.    D. Days in a week.

7. Why did a Roman farmer kill an animal before planting his fields?

Because      .

A. killing an animal would bring him good luck

B. Saturn enjoyed eating animals

C. Saturn was happy to see animals being killed

D. he wanted to please Saturn so that Saturn would make the weather good for his planting

8. Which of the following is NOT TRUE?

A. Saturn is also the name of planet.

B. The Roman people used to believe Saturn to be their god.

C. Saturn was named for the last day of the week.

D. Saturn had three meanings.

9. What’s the aim of the author in writing this passage?

A. How the Romans worshipped (崇拜) Saturn.

B. Why the Romans believed in Saturn.

C. The different meanings of the word Saturn.

D. How Saturday got its name.