问题 问答题

(1)水煤气是将水蒸气通过灼热的焦炭而生成的气体,主要成分是一氧化碳、氢气及少量的二氧化碳和水蒸气.某课题组同学为验证水煤气的成分,做了以下准备:

(一)资料收集:①H2+CuO

.
Cu+H2O②CO+CuO
.
Cu+CO2③无水硫酸铜遇水由白色变为蓝色④氢氧化钠溶液能够吸收二氧化碳气体⑤浓硫酸有吸水性,可作干燥剂.

(二)设计实验装置

请分析上面信息后回答:

①你认为验证水煤气中各成分的顺序依次是______;

②装置C的目的是______,装置D的作用是______;

③装置E内观察到的现象是______;

④实验中两次用到装置B,其目的分别是______,

______;

请你设计一种尾气处理方案:______.

答案

①由题意可知,无水硫酸铜由白色变为蓝色、澄清的石灰水变浑浊、黑色的氧化铜转变成红色的铜及

无水硫酸铜由白色变为蓝色、澄清的石灰水变浑浊,分别验证水煤气中各成分的顺序依次是:H2O、CO2、H2、CO;

②由于氢氧化钠能与二氧化碳反应,装置C的目的是:吸收二氧化碳.浓硫酸具有吸水性,装置D的作用是:除去水蒸气;

③氧化铜是黑色的铜石红色的,在加热的条件下,一氧化碳和氢气能将氧化铜还原为铜.所以,装置E内观察到的现象是:黑色变成红色;

④实验中两次用到装置A,其目的分别是验证水煤气含有水蒸气,通过验证生成物中有水蒸气来证明水煤气中含有氢气,尾气一般要收集火、点燃,所以尾气处理方案:将玻璃管改成尖嘴点燃;

故答为:①H2O、CO2、H2、CO;②吸收二氧化碳气体,除去水蒸气;③反应物由黑色变成红色;④验证水煤气含有二氧化碳气体;通过验证生成物中有二氧化碳来证明水煤气中含有一氧化碳;将玻璃管改成尖嘴点燃或用气球收集.

阅读理解

阅读理解

     Our school is always asking students to take part in school activities. Every week there is a Film Night of popular

Chinese and English films. After the films, there are group discussions, where the audience can share their ideas and

ask questions about the films. Every two weeks, on Wednesday, there is a Cooking Night. Students come and cook

delicious Chinese dishes. The first Thursday night of each month is a Fun Night. Students come to play computer

games or to sing karaoke songs. There arc karaoke competitions, so young people can come and show off their voices.

     There are also a few short classes on such subjects as Chinese handwriting and the history of China. They are open

to the whole city. Every year we have a special activity with the name"China Night". It is our most exciting and biggest

activity of the year. There is traditional and modem Chinese singing, dancing and acting. What a great night it is!

1.The students can ________every week.

A. play computer games

B. cook Chinese food

C. see films

D. enjoy modem dancing

2.From Children's Day to June 30,the students can cook Chinese dishes ________.

A. once

B. twice

C. three times

D. four times

3.The students can play computer games and sing karaoke songs on ________.

A. June 5

B. June l2

C. June 19

D. June 26

4.Short Chinese handwriting class are for ________in the city.

A. all the students

B. teachers and students

C. parents and students

D. everyone

5.The biggest activity of the year is ________.

A. Film Night

B. Cooking Night

C. Fun Night

D. China Night

单项选择题