（6分）Q、W、X、Y、Z为5种短周期元素，且原子序数依次增大。W、_爱下问搜题

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问题填空题

（6分）Q、W、X、Y、Z为5种短周期元素，且原子序数依次增大。W、X与Y同周期，Y与Z同主族。Q与W可以按照原子个数比4∶1形成化合物甲，且甲分子中含有10个电子。Q与X形成化合物乙，乙可与Z的最高价氧化物的水化物按照物质的量之比2∶1反应形成盐丙。

（1）甲的电子式是。

（2）Q和Y形成的既含极性键又含非极性键的共价化合物的化学式是。

（3）向少量丙溶液中加入浓Ba(OH)₂溶液至过量并加热，反应的离子方程式是。

答案

（1）（2）H₂O₂

（3）2NH₄⁺ + SO₄²^－ + Ba²⁺ + 2OH^－BaSO₄↓ + 2NH₃↑+ 2H₂O

Q与W可以按照原子个数比4∶1形成化合物甲，且甲分子中含有10个电子。甲是CH₄，依据Q、W、X、Y、Z原子序数依次增大，所以Q为H，W为C。 Q与X形成化合物乙，乙可与Z的最高价氧化物的水化物按照物质的量之比2∶1反应形成盐丙。X为N，Y为O，Z为S。

完形填空

Soon it would be the holidays, but before that, there were year exams. All the in the school had been working hard for some time, reviewing their lessons for the exams. If they didn’t , they would have to retake(重考) them in September. There were usually a few who , but Jane didn’t want to be one of them. She had worked hard all year, just before the exams she was working so hard that her sister Barbara was about her. She went to bed too . The night before the first exam, Barbara that she have an early night and take a pill. She promised to wake up in the morning.
As she was falling asleep, Jane was afraid that she might oversleep. Her kept jumping from subject to subject. At last, with the help of , she went to sleep. In no time at all, she was sitting in the examination hall, looking at the examination , but she couldn’t answer any of the questions. around her was writing pages and pages. she thought hard, she couldn’t find anything to write . She kept looking at her . Time was running out. There was only an hour to go. She started one question, wrote two sentences, and tried another one. With only half an hour left, she wrote another two sentences. By this time she was so worried that she started . Her whole body shook. It shook so much that she up. She was still in bed and it had all been a dream. A minute later, Barbara called her name.

B．her parents

C．the lessons

D．the medicine

A．The teacher

B．The students

C．look around

D．thought over

单项选择题

飞机以一定速度逆风起飞时（）

A.升力将减小

B.升力将增大

C.阻力增大升力减小