问题 实验题

乙醇是以高粱、玉米、薯类等为原料,经发酵、蒸馏制得,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《车用乙醇汽油国家标准》并于同年4月15日开始实施。 乙醇(C2H5OH)完全燃烧时生成CO2和H2O。如果氧气不足,乙醇燃烧可生成多种物质。现用下图装置进行实验,确证乙醇燃烧产物中有CO、CO2和H2O。

请回答下列问题:

(1)能确证产物中有H2O的现象是________________________;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)为了保护环境,应在装置的排气管口采取的措施是________________________。

答案

(1)装置A中白色粉末变蓝;装置D中石灰水变浑浊(或装置E中黑色粉末变成亮红色;装置F中石灰水变浑浊。)

(2)检验产物中有无CO2;吸收产物中含有的CO2;检验C装置是否将产物中含有CO2完全吸收。

(3)点燃

填空题
阅读理解

阅读理解。

     Young women are more adventurous than young men when traveling abroad in gap years.One in

three female backpackers visits more than three countries during a year out and travels alone, according

to new research.

     By contrast, the majority of their male counterparts(对手方) visit only one country and tend to travel

in groups, says a survey by the Gap Year company, which provides information and services for students

considering taking a year out.

     More women than men say that their prime reason for taking time off is to see the world and

experience different cultures.Men were more likely to rank "having fun" higher on their list of priorities.Women were more likely to value the challenge of a foreign trip, and many cited reasons such as learning

a language and meeting new people.

     The more adventurous gap years taken by women seem to work to their benefit; more than three

quarters of those surveyed reported increased confidence, self-reliance and independence, whereas only

half of the men had that experience.

     The research also showed that women were more likely to do voluntary work while travelling, with

more than one in ten helping with teaching or development projects.One of the reasons given for this is

a wish to see the country in an authentic(真正的) light.

     A greater proportion(比率) of women than men faced objections or criticism from their families over

their gapyear plans.Among the men surveyed, lack of money was the main barrier to travel.

     Carolyn Martin, a doctor from London, was a typically confident female traveller.Starting in Cape

Town, she travelled around southern Africa and Australia with a string of unusual and sometimes

dangerous jobs.

     "I had one job chasing elephants off the runway in Africa by banging a stick against a pan," she re

called."It was OK but one day I did get chased by one."

     She said that she had travelled alone because "you meet more people".

1.According to the article, ________.

A.most of the women students will travel abroad during the summer holidays

B.one third of the women students will travel abroad in a year

C.women students are more likely to travel abroad alone in gap years

D.women students are willing to travel abroad in a group

2.More women than men say that their prime reason for taking time off is______ .

A. to make a study of history

B. to have fun

C. to see the world and experience different cultures  

D. to do voluntary work

3.Which of the following statements is TRUE?

A.Men students will travel less during the gap year because of their parttime jobs.

B.Women students will travel more but face more objections.

C.The article suggests that women travelling alone will have dangerous experiences.

D.Men students prefer to travel inside their own country to going abroad.

4.Which of the following would be the main point of the passage?

A.Girls Get the Best out of Gap Years

B.Boys Lack Courage in Gap Years

C.For Fun or for Adventure?

D.Young Women Are More Adventurous