问题 实验题

下图是铜与稀硝酸反应的两个实验装置图,请回答下列问题:

(1)I实验装置中能否证明铜与稀硝酸反应生成的是NO气体______________(填“能”或“不能”),简述理由________________。

(2)①若用Ⅱ实验装置进行实验,以证明铜与稀硝酸反应生成的气体是NO,则检查气密性的操作是_____________________________________。

②在烧杯中加入一定体积的稀硝酸,打开止水夹,用注射器慢慢抽取干燥管内的空气,稀硝酸沿着干燥管慢慢上升,直到充满整个干燥管,停止抽拉注射器,关闭止水夹,观察到干燥管内的现象为____________________。

③反应停止后,打开止水夹,用注射器抽取干燥管内的气体(事先已将注射器内原有的空气推出),关闭止水夹后取下注射器,并抽取一定量的空气,观察到的现象是________。

(3)上述实验完成后,将注射器内的气体通入到NaOH溶液中,其目的是__________。

(4)铜与1mol/L的硝酸反应。如果NO3-浓度下降0.2mol/L,则溶液中c(H+)同时下降_____________mol/L

答案

(1)不能;因为圆底烧瓶中有空气,空气中的氧气会与NO反应生成NO2,出现红棕色

(2)①关闭止水夹,将干燥管放入带有水的烧杯中,若干燥管内的液面比烧杯中的液面低,且过一段时间后干燥管内的液面位置保持不变,则表明该装置的气密性良好。(或其它合理答案);②铜片溶解,且表面有无色气泡产生,溶液变成蓝色,液面下降;

③有红棕色气体产生

(3)防止污染环境

(4)0.8

阅读理解

An Australian man who has been donating his extremely rare kind of blood for 56 years has saved the lives of more than two million babies.

James Harrison has an antibody in his plasma(血浆)that stops babies dying from Rhesus disease, a form of severe anaemia. He has enabled countless mothers to give birth to healthy babies, including his own daughter, Tracey, who had a healthy son thanks to her father's blood.

Mr. Harrison has been giving blood every few weeks since he was 18 years old and has now racked up a total of 984 donations. When he started donating, his blood was deemed so special that his life was insured for one million Australian dollars.

He was also nicknamed the “man with the golden arm” or the “man in two million”. He said, “I've never thought about stopping. Never!” He made a pledge to be a donor aged 14 after undergoing major chest surgery in which he needed 13 liters of blood. “I was in hospital for three months,” he said. “The blood I received saved my life so I made a pledge to give blood when I was 18.”

Just after he started donating he was found to have the rare and life-saving antibody in his blood. At the time, thousands of babies in Australia were dying each year of Rhesus disease. Other newborns suffered permanent brain damage because of the condition. The disease creates an incompatibility between the mother's blood and her unborn baby's blood. It stems from one having Rh-positive blood and the other Rh-negative.

His blood has since led to the development of a vaccine called Anti-D. After his blood type was discovered, Mr. Harrison volunteered to undergo a series of tests to help develop the Anti-D vaccine. “They insured me for a million dollars so I knew my wife Barbara would be taken care of,” he said. “I wasn't scared. I was glad to help. I had to sign every form going and basically sign my life away.”

Mr. Harrison is Rh-negative and was given injections of Rh-positive blood. It was found his plasma could treat the condition and since then it has been given to hundreds of thousands of women. It has also been given to babies after they are born to stop them developing the disease.

It is estimated he has helped save 2.2 million babies so far. Mr. Harrison is still donating every few weeks now.

小题1:What does the underlined phrase “two million” refer to?

A.mothers

B.babies

C.dollars

D.blood小题2:Why did James decide to donate his blood? Because _____.

A.his daughter asked him to help her son

B.he has a golden arm worth a million dollars

C.a vaccine called Anti-D is to be developed

D.someone else’s blood saved his life小题3:The sentence “The disease creates an incompatibility between the mother's blood and her unborn baby's blood” (underlined in Paragraph 5) suggests that _____.

A.the mother and the baby have different types of blood

B.babies suffer permanent brain damage before born

C.Rhesus disease contributes to permanent brain damage

D.all the patients have a rare antibody in their blood小题4:What can we infer from the sixth paragraph?

A.His wife Barbara needed to be taken care of badly then.

B.Mr. Harrison was not glad to help develop a new vaccine.

C.Some of the tests to develop the vaccine are dangerous.

D.His blood type was accidentally discovered after tests

单项选择题