问题 填空题

根据图回答问题:

(l)图中a的仪器名称      

(2)用高锰酸钾制取氧气的化学方程式为                   ,收集氧气所选用的装置是  (填字母,下同).

(3)用大理石和稀盐酸制取二氧化碳时,所选用的发生装置是        ,反应的化学方程式为                                   

(4)如图F所示装置有多种用途,下列说法正确的是         

A.除去氧气中的水蒸气——瓶内盛放浓硫酸

B.检验二氧化碳气体——瓶内盛放氢氧化钠溶液

C.用排空气法收集氢气——气体从装置的b端通入

D.用排水法收集氧气——瓶内先装满水,气体从b端通入.

答案

(1)试管

(2)2KMnO4K2MnO4+MnO2+02↑      CE

(3)B    CaCO3+2HCl═CaCl2+CO2↑+H2O; (4)ACD.

题目分析:

(1)a是试管;

(2)用高锰酸钾制氧气时,反应物是高锰酸钾,生成物是锰酸钾、二氧化锰、氧气,反应条件是加热,因此反应的化学方程式为:2KMnO4K2MnO4+MnO2+02↑;氧气不易溶于水且密度大于空气,所以既可以用排水法收集,也可以用向上排空气法收集;

(3)实验室用稀盐酸与大理石反应制取二氧化碳,其中的碳酸钙与盐酸反应生成氯化钙、水和二氧化碳,反应的方程式:CaCO3+2HCl=CaCl2+H2O+CO2↑;属于固体和液体在常温下的反应,因此应选用的发生装置是B;

(4)A、浓硫酸具有吸水性,与氧气不反应,可以干燥氧气,故选项正确; 

B、检验二氧化碳气体应该用澄清的石灰水,通入氢氧化钠溶液无变化,故选项错误;

C、氢气的密度比空气小,排空气法收集氢气﹣气体从装置的短管b端通入;故选项正确;

D、氧气的不易溶于水,应该从短管进入,故选项正确;故选ACD.

填空题
阅读理解

阅读理解。

     Tina is my friend. She comes from Australia. She is a ten-year-old girl. She is quiet and beautiful.

She lives in Jinan now. She has many Chinese friends. Her father and mother are teachers. They teach in

our school.

     Tina likes Chinese very much. She thinks Chinese is very interesting, but very difficult. She often plays with her Chinese friends. We teach her Chinese, and she teaches us English. Tina can speak some

Chinese.

      But she can't write it. Her favorite sport is ping-pong. We play with her on weekends.

1.Where is Tina from?         

A. Jinan.                                 

B. Australia.         

C. America.                        

D. China.

2. How old is Tina?         

A. 13.                  

B. 12.          

C. 11.      

D. 10.

3. Tina thinks ______.         

A. Chinese is very easy         

B. Chinese is very interesting         

C. she writes Chinese well         

D. Chinese is not interesting

4. We learn ______ from Tina.         

A. Chinese          

B. French         

C. English                        

D. ping-pong

5. Tina may play ping-pong with us on ______.      

A. Sundays                        

B. Fridays

C. Tuesdays                      

D. Mondays