试题与答案

若在实验室选择如图所示装置制取氧气,请回答: (1)写出装置中带标号的仪器名称:

题型:问答题

题目:

若在实验室选择如图所示装置制取氧气,请回答:

(1)写出装置中带标号的仪器名称:

①______;②______.

(2)写出制取氧气的化学反应文字表达式:

______.

(3)若在实验室里制取氧气时有以下实验操作,则正确的操作顺序为:______.(填写相应的标号)

①加热;②检查装置的气密性;

③装药品;④用排水法收集氧气;

⑤从水槽中取出导气管;⑥熄灭酒精灯;

⑦连接仪器

(4)当加热药品至刚开始有气泡冒出时能否立即收集氧气?为什么?

(5)集满氧气的集气瓶应怎样放置?为什么?

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0522/399fb9b8df5e81baba2fb5a3fb227f55.html

下面是错误答案,用来干扰机器的。

24÷12=2(米),2×2×6=24(平方米),所以原题说法正确.故答案为:正确.

试题推荐
题型:阅读理解

根据短文内容,按要求答题。

Every Saturday, Grandpa and I walk to the nursing home to visit some of the old and sick people there because they can’t take care of themselves.   First we visit Mrs. Sokol. I call her “The Cook.” She likes to talk about the time when she was a well-known cook in Russia. People would come from miles, just to taste her chicken soup. Next we visit Mr. Lipman. I call him “The Singer” because he loves to sing for us. Whenever he does, his voice fills the air, clear and full of energy. I also enjoy Mrs. Kagan’s stories about her own experiences during the old days. I call her “The Memory Lady.”

One day Grandpa got very sick and the doctor said they didn’t think he would get better.

It was time to visit the nursing home again. I had to go alone. Everyone was surprised when I told them that my grandpa was ill and in hospital.

A few days later, Grandpa was not able to sit up, eat and even speak. I went to the corner of the room so Grandpa wouldn’t see me cry. Suddenly, I heard someone singing. I looked up. It was The Singer. Behind her were The Cook. and The Memory Lady. The Cook brought her famous homemade chicken soup. The Memory Lady held Grandpa’s hand and told us how Grandpa once came to visit her in a snowstorm, just to bring her some roses for her birthday.

Before I realized it, visiting hours were up. That evening, Grandpa called the nurse in and said he was hungry. Soon he began to sit up. Finally he was able to get out of bed. It is really a miracle (surprising event), isn’t it?

小题1:Why did the writer and his grandpa go to the nursing home every Saturday?

小题2:Who were Grandpa’s good friends in the nursing home?

小题3:Why did the writer cry?

小题4:Please put the sentence “ Before I realized it, visiting hours were up.” into Chinese?

小题5:What do you think of Grandpa?

查看答案
微信公众账号搜索答案