问题 实验题

结合以下实验室制取气体的常用装置回答问题:

(1)写出标号仪器的名称:①            ;②           

(2)实验室用过氧化氢溶液与二氧化锰固体混合制取氧气时,应选用的发生装置是             (填序号,下同),收集装置是                ,反应的化学方程式为                           

(3)能用C装置收集的气体,必须具备的性质是                         

答案

(1) ①试管;②集气瓶

(2) B ;D(或E) ;2H2O22H2O + O2

(3) 密度比空气小且不与空气中的物质反应

单项选择题
阅读理解

My parents were in a huge argument, and 1 was really upset about it. I didn't know who I should talk with about how I was feeling. So I asked Mom to allow me to stay the night at my best friend's house. Though I knew I wouldn't tell her about my parents’ situation, I was looking forward to gelling out of the house. I was in the middle of packing up my things when suddenly the power went out in the neighborhood. Mom came to tell me that I should stay with my grandpa until the power came back on.

I was really disappointed because I felt that we did not have much to talk about. But I knew he would be frightened alone in the dark. I went to his room and told him that I'd stay with him until the power was restored. He was quite happy and said, "Great opportunity."

"What is?" I asked.

"To talk, you and I" he said. "To hold a private little meeting about what we’re going to do with your mom and dad, and what we're going to do with ourselves now that we're in the situation we are in."

"But we can't do anything about it. Grandpa," I said, surprised that here was someone with whom I could share my feelings and someone who was in the same "boat" as I was.

And that's how the most unbelievable friendship between my grandfather and me started. Sitting Acre in the dark, we talked about our feelings and fears of life — from how fast things change, to how they sometimes don't change fast enough. That night, because the power went out, I found a new friend, with whom I could safely talk about all my fears and pains, whatever they may be — suddenly, the lights all came hack on. "Well," he said, "I guess that means you'll want to go now. I really like our talk. I hope the power will go out every few nights!"

56.1 wished to get out of the house because ____

A. I was angry about my parents’ quarrel        B. I found nobody to share my feelings with

C. I wanted to escape from the dark house        D. I planned to tell my friend about my trouble

57. Grandpa was happy to see me because _____.

A. he could discuss the problem with me    B. he had not seen me for a long lime

C. he was afraid of darkness              D. he felt quite lonely

58. What can be inferred from the passage?

A. The grandchild was eager to leave.     B. They would have more chats.

C. The lights would go out again.        D. It would no longer be dark.