问题 问答题

环境污染人类的威胁,已成为全世界的共同问题.保护环境,创建绿色家园是每个人的责任.请你回答下列有关问题;

(1)如图中所列实验不会造成环境污染的是______(填序号).

(2)写出图②所示实验中发生反应的化学方程式______.

(3)请从上述你认为能造成环境污染的实验中选取一个,就此设计一个消除或减少污染的实验______.

答案

首先,明确造成空气污染的主要污染物有颗粒物质、一氧化碳、二氧化硫、氮的氧化物、碳氢化合物等;然后,回顾三个化学实验,硫燃烧生成二氧化硫有污染,可利用氢氧化钠溶液吸收或在密闭的容器内点燃;一氧化碳还原氧化铁时实验步骤是:①先通入CO一会儿,②加热 ③停止加热 ④继续通入CO到玻璃管冷却为止,由此可知,实验过程中①④的一氧化碳并未参加化学反应,排放到大气中造成污染,可利用一氧化碳的可燃性将其点燃.

故答案为:

(1)③

(2)Fe2O3+3CO

  △  
.
 
2Fe+3CO2

(3)①实验时应盖上玻璃片,再用氢氧化钠溶液吸收二氧化硫或在密闭的容器内点燃;或②用酒精灯将尾气点燃.

阅读理解

阅读理解。

     Tea bag drinking is most Westerns' favorite way of drinking tea. Do you know how it came about?

     The tea bag was invented in 1908 by Thomas Sullivan, an American tea seller. He was sending out free

tea in silk (丝绸) bags for people to try. People put the bags together with the tea leaves into the cup and

added hot water. The tea tasted good, and people thought it was easy to clean the cup. They were not happy

when Sullivan started sending them loose (散的) tea again.

     Sullivan realized that he had a hot new thing in his hands, and he built a machine to pack the bags. As tea

bags became popular, they were changed from silk to gauze (薄纱) and later paper. In 1952, Lipton Tea

made the tea bag even more popular with its invention of the four-sided tea bag. Tea bags were soon a hit

in the UK, and today 85% of the tea in the UK is packed in paper bags.

     However, many people still prefer loose-leaf tea. This is because some tea companies put not very good

tea in their tea bags. But for most drinkers, tea bags are still the easy, tasty way to go.

1. Who invented the tea bag?

A. An English tea seller.

B. Chinese.

C. Lipton.

D. Thomas Sullivan.

2. The tea in silk bags was welcome because ________.

A. the tea in bags was free and very good

B. the tea tasted good and the cup was easy to wash

C. people were happy with the loose tea

D. people didn't know any better way to enjoy the tea

3. The material of the tea bags is usually ________ now.

A. silk

B. gauze

C. paper

D. plastic

4. The underlined sentence "Tea bags were soon a hit in the UK" probably means"________ in the UK".

A. Tea bags soon became popular

B. Tea bags surprised everyone very much

C. Tea bags kicked (踢) the loose-leaf tea out of the market

D. Tea bags weren't allowed to be sold

5. The reading mainly talks about ________.

A. the invention of tea

B. the way of drinking tea

C. the history of tea bags

D. people's favorite tea in the world

单项选择题