皮皮学，免费搜题
登录
搜题
【简答题】
乙醇是以高粱、玉米、薯类等为原料，经发酵、蒸馏而制得，属于可再生能源。 在汽油中加入适量乙醇作为汽油燃料，可节省石油资源，减少汽车尾气的污染。2001年4月2日国家技术监督局发布《乙醇汽油》国家标准，并于同年4月15日开始实施。乙醇(C 2 H 5 OH)完全燃烧时生成CO 2 和H 2 O。如果氧气不充足，乙醇燃烧可能还生成CO。现用以上装置进行实验，确证乙醇燃烧产物中有CO、CO 2 和H 2 O。请回答下列问题： (1)能确证产物中有H 2 O的现象是无水CuSO 4 变蓝；能确证产物中有CO的现象是_______________ (2)实验时，可观察到装置B中石灰水变浑浊，D中石灰水无变化。B装置的作用是_____________；C装置的作用是______________；D装置的作用是_________________。 (3)若乙醇燃烧产物中CO和CO 2 的总质量为25.2 g，其中碳元素与氧元素的质量比为2：5，则参加化学反应的乙醇的质量为______________，反应产物中H 2 O的质量为______________。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】(Section B passage 1) 1.
A.
Children know how to handle a real gun.
B.
Children are not interested in real guns.
C.
Children know not to touch a real gun.
D.
Children won't know where a gun is hidden.
【单选题】Section B passage 1
A.
The sky is space.
B.
High in the sky the air is thin.
C.
There is nothing in the sky.
D.
The sky is all around the world.
【单选题】(Section B passage 1) 5.
A.
She fought against gun violence.
B.
She called on the Government to have gun control.
C.
She always put a gun in her car.
D.
She asked people to support gun ownership.
【简答题】( A ) Dear Jack, I am in China now. I have many new friends here. They are very friendly. I often have dinner with them. I like many kinds of Chinese food, like Sichuan food, Hunan food and Guan...
【单选题】(Section B passage 1) 3.
A.
She tried to get her gun.
B.
She crawled on the floor.
C.
She rushed to the madman.
D.
She ran to the door.
【简答题】Section B Passage 1
【单选题】(Section B passage 1) 2.
A.
They are 3-7 years old.
B.
They are 5-9 years old.
C.
They are 8-12 years old.
D.
They are 10-14 years old.
【单选题】(Section B passage 1) 2.
A.
They were serving customers at the restaurant.
B.
They were talking outside the restaurant.
C.
They were waiting for their car to be repaired.
D.
They were having lunch in the restaurant.
【单选题】(Section B passage 1) 3.
A.
Only a few.
B.
Half of the children.
C.
All of the children.
D.
Most of the children.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
