问题 阅读理解

Female Chinese space pioneers?

CHINA plans to recruit(招募) women astronauts thanks to the lobbying(游说) of the leading women’s organization. Gu Xiulian, president of the All-China Women’s Federation(ACWF) (全国妇联), said on Saturday that she put forward a proposal that women be trained for space missions after the manned space flight last October. And it was accepted by the central authorities, local media reported. But the plan to recruit female astronauts has yet to be worked out, according to sources close to the astronaut-training programme.

Beijing needs mental health care

MORE than 1,000 people committed suicide(自杀) in Beijing last year, and experts have been encouraging the capital to set up a mental health care system as soon as possible, local media reported last week. About 20 percent of the people of Beijing live in unhealthy conditions, with 3 percent of these suffering from affective disorder and 5 percent reporting symptoms of depression, according to the Beijing Mental Health Service Center.

No need to fear your licence plate

CAR licence plates in Shenzhen and Guangzhou, Guangdong Province, will not have the number “four” from this month on ---a move that has led to heated discussion among officials, schools and residents. The word for “four” sounds like “death” in Cantonese. The number has been cleared away from the computer data banks that generate the six-digit licence numbers for local cars. Some say that, for the first time, a public agency service has considered local customs and bans. Others worry it will encourage superstitious(迷信的) beliefs.

83.We can infer from the news that ____.

A.there are several female astronauts in China now

B.people in Guangdong province hate number “four”

C.the mental disorder concerns everybody all over the country

D.the city government of Beijing has promised to set up a mental health care system

84.The underlined sentence in the third news means that __    __.

A.there is no number “four” in the computers in Shenzhen

B.computer is used to print six-digit car licence numbers

C.local cars will be protected to use six-digit car licence numbers

D.number “four” will no longer appear in the six-digit car licence numbers

85.What is the message of the first news?

A.China only needs male astronauts.

B.Gu Xiulian wants to be the first space woman.

C.Society doesn’t discriminate(歧视) against women in China.

D.The  proposal of female astronaut training hasn’t been approved.

86.Which word has the same meaning as the underlined word “symptoms”?

A.symbol        B.signs           C.sorts      D.shocks

答案

83---86   BDCB

实验题

亚硝酸钠(NaNO2)是重要的防腐剂。某化学兴趣小组尝试制备亚硝酸钠,查阅资料:①HNO2为弱酸,在酸性溶液中,NO2-可将MnO4-还原为Mn2且无气体生成。

②NO不与碱反应,可被酸性KMnO4溶液氧化为硝酸

探究一 亚硝酸钠固体的制备

以碳和浓硝酸为起始原料,设计如下装置利用一氧化氮与过氧化钠反应制备亚硝酸钠。(反应方程式为2NO+Na2O2=2NaNO2,部分夹持装置和A中加热装置已略)

(1)写出装置A烧瓶中发生反应的化学方程式                          

(2)有同学认为装置C中产物不仅有亚硝酸钠,还有碳酸钠和氢氧化钠,为排除干扰应在B、C装置间增加装置E,E中盛放的试剂应是         (填字母)。

A.浓H2SO4   B.碱石灰  C.无水CaCl2

探究二 亚硝酸钠固体含量的测定及性质验证

称取装置C中反应后的固体4.000g溶于水配成250mL溶液,取25.00mL溶液于锥形瓶中,用0.1000

mol/L酸性KMnO4溶液进行滴定,实验所得数据如下表所示:

滴定次数1234
KMnO4溶液体积/mL20.6020.0220.0019.98
 

(3)第一组实验数据出现异常,造成这种异常的原因可能是        (填字母)。

A.酸式滴定管用蒸馏水洗净后未用标准液润洗

B.锥形瓶洗净后未干燥

C.滴定终了仰视读数

(4)根据表中数据,计算所得固体中亚硝酸钠的质量分数                    

(5)亚硝酸钠易溶于水,将0.2mol·L-1的亚硝酸钠溶液和0.1mol·L-1的盐酸等体积混合,混合后溶液呈酸性,则混合后溶液中离子浓度由大到小的顺序为           

探究三  反应废液的处理

反应后烧瓶A中仍然存在一定量的硝酸,不能直接排放,用NaOH溶液调成中性,再用电化学降解法进行处理。25℃时,反应进行10min,溶液的pH由7变为12。电化学降解NO3-的原理如右图所示。

(6)电源正极为       (填A或B),阴极反应式为                       

解答题