问题 实验题

在呼吸面具和潜水艇中可用过氧化钠作为供氧剂。请选用适当的化学试剂和实验用品,用上图中的实验装置进行实验,证明过氧化钠可作供氧剂。

(1)A是制取CO2的装置。写出A中发生反应的化学方程式:_________________

(2)填写表中空格:

(3)写出过氧化钠与二氧化碳反应的化学方程式:                                              

(4)试管F中收集满气体后,下一步实验操作是:                      

答案

(1)CaCO3+2HCl=CaCl2+H2O+CO2

(2)

(3)2Na2O2+2CO2=2Na2CO3+O2

(4)把E中的导管移出水面,关闭分液漏斗活塞,用姆指堵住试管口,取出试管,立即把带火星的木条伸入试管口内,木条复燃,证明试管中收集的气体是氧气。

阅读理解

Do you know the open-air art gallery in London's Blackall Street? Probably -not. Not many  Londoners know it either, but Henri does and he is willing to show it to you.

Henri used to sleep in parks until he met a charity(慈善机构) that helps homeless people get  back on their feet by becoming tour guides.

Rather than show traditional London sights, “Unseen Tours" take people off the beaten track. Henri has been teaching tourists about the history and architecture of Shoreditch, where he slept on public benches for three years.

When he felt separated from the society, contact with the volunteer network "The Sock Mob" gave Henri hope. "Not everyone just looked down on me," he said. The tours aren't the only actions trying to help those who have suffered a misfortune to stand tall again.

An innovative(创新的) college for homeless people in London, the first of its kind in the country, is attracting hundreds of students. The Recovery College, set up by St Mungo's charity, is providing courses designed to improve technical skills and life skills.

According to Andy Williams, who helps to organize the college, the most popular courses have proved to be about raising self-confidence and developing self-pride.

Steve, now in his 50s, told a reporter how much of a difference it makes to "have a bit of confidence". He had difficulty learning to read and had to leave school when he was 12. Because Steve's problem was not recognized at the time, he was "seen to be unable to read or write", and suffered with depression and alcohol addiction. He says the status of "student" is itself important for people who are used to being treated as outcasts(被遗弃者)

Some charities aim not only to help the homeless become independent but also to make them popular. The Homeless World Cup started ten years ago. Today the tournament draws teams from 48 countries made up of players-men and women-who are, or have been, living in the streets.  It gives them a chance to become football heroes.

小题1:The underlined part "take people off the beaten track" means "take people to______.”

A.famous galleries

B.traditional sights

C.unusual places

D.public benches小题2:How does the Recovery College help the homeless people?

A.By training them to be guides

B.By offering them different courses.

C.By keeping in contact with them.

D.By asking more students to help them.小题3:At the age of 12, Steve _______ .

A.wasn't treated as a normal student

B.had much confidence in himself

C.didn't want to study at school

D.left school because of depression小题4:The purpose of the Homeless World Cup is to help the homeless people _______.

A.become football stars

B.improve life skills

C.gain self-confidence

D.find proper jobs小题5:Which is the best title for the passage?

A.Confidence Back Now.

B.London Tour.

C.The Popular Homeless.

D.Football Heroes.

单项选择题