问题 选择题

已知,A为空气中含量最多的单质。根据下图转化关系,回答下列问题:

(1)写出下列物质的化学式:

A         、D         

(2)E→C的反应方程式为                    

(3)久置的E的浓溶液常常呈黄色,原因是                      

(4)实验室制取B的化学方程式为____________________________________。

(5)现有1.00mol·L-1的E溶液,从中取出10.00 mL。此10.00 mL溶液的物质的量浓度为   mol·L-1。将前面取出的E溶液配制成0.100mol·L-1的稀溶液,所需的玻璃仪器除烧杯、玻璃棒外,还需         和          。在配制过程中定容时俯视,则所配溶液浓度       (填“偏大”或“偏小”或“无影响”)。

答案

(1)N2    NO2(每空1分,共2分)

(2)3Cu + 8HNO3 = 3Cu(NO)3 + 2NO↑+ 4H2O(2分)

(3)硝酸分解产生NO2溶解在硝酸中(2分)

(4)2NH4Cl + Ca(OH)2 = CaCl2 + 2NH3↑+ 2H2O(2分)

(5)1.00  100毫升容量瓶 胶头滴管 偏大(每空1分,共4分)

题目分析:分析:当A为空气中含量最高的单质气体时,应为N2,则C为NO,B为NH3,D为NO2,E为HNO3;(1)写出下列物质的化学式:A、N2;NO2;答案:N2    NO2;(2)E→C的反应方程式为3Cu + 8HNO3 = 3Cu(NO)3 + 2NO↑+ 4H2O,答案:3Cu + 8HNO3 = 3Cu(NO)3 + 2NO↑+ 4H2O;(3)E为HNO3,久置的E的浓溶液常常呈黄色,原因是硝酸分解产生NO2溶解在硝酸中,答案:硝酸分解产生NO2溶解在硝酸中;(4)B为NH3,实验室制取B的化学方程式为2NH4Cl + Ca(OH)2 CaCl2 + 2NH3↑+ 2H2O,答案:2NH4Cl + Ca(OH)2 CaCl2 + 2NH3↑+ 2H2O;

⑸溶液有均一性和稳定性,E为HNO3,1.00mol·L-1的E溶液,从中取出10.00 mL。此10.00 mL溶液的物质的量浓度为 1.00mol·L-1,将前面取出的E溶液配制成0.100mol·L-1的稀溶液,所需的玻璃仪器除烧杯、玻璃棒外,还需100毫升容量瓶和胶头滴管,在配制过程中定容时俯视,定容体积偏小,则所配溶液浓度偏大。 答案:1.00  100毫升容量瓶 胶头滴管 偏大

单项选择题
完形填空

The Chinese New Year is a great holiday to choose to celebrate Chinese culture with your child. Here are few fun ways to bring a bit of fun and  1  into your home through the festivities of the Chinese New Year.

1.Add a lucky red door. Red is a traditional color of   2 . It's an important part of the Chinese New Year to   3 on doing what one can to bring about good luck for the New Year. If you don't want to  4  the door red, how about wrapping it up like a present with red wrapping paper. If changing your front door's color is not workable, how about the door to your child's bedroom?

2.Eat. A huge part of most cultures is that of food and the Chinese New Year is not   5 , it's eating jiaozi at midnight on New Year's Eve, or longevity noodles on day seven of the festivities to    6 long life. The Chinese New Year celebrations mean many fancy meals that your child will   7 .

3.Create a lantern. Sara Naumann, the Guide to China Travel, shares a bit about the legend of the Lantern Festival or Yuanxiao, which occurs on the   8 day of the Chinese New Year festivities. It's a   9 that includes an emperor, a young woman who misses her family, and tricking the God of Fire. Your kids should love this story. After   10 it with them, or while reading the story, enjoy making your own paper lantern to display.

4.Give lucky money. The Guide to Mandarin Language shares that another very popular   11 during the Chinese New Year is that of the gift of red envelopes with   12 in them. These gifts are given to children and usually follow a bit of superstition(迷信) in that the money needs to be given in even amounts and never contain   13 numbers, such as four. Therefore, four dollars is not a good gift. The envelopes are also decorated with lucky symbols and New Year   14 .

5.Give a small gift. The giving of simple gifts is also an appropriate way to   15 the Chinese New Year. What better gift than that of a children's book about the Chinese New Year or the Chinese Culture.

6.Make some noise. Just like in America, the Chinese use   16 in ringing in their New Year. In the Chinese culture it began as a way to   17  away any demons(鬼) that threaten to bring a profitable and lucky New Year, but today it's also about excitement and   18  . Consider setting off a few firecrackers of your own, if allowed in your area. If not, make a cute firework picture with a bit of glitter and glue. A pretend firecracker is another great craft that could also be considered a festive way to decorate your New Year table.

7.Sing Happy Birthday to your dog. The second day of the Chinese New Year is   19 the birthday of all dogs. Why not   20 your child to throw Fido a birthday celebration? Perhaps an extra ride in the car or new chew toy is in order? I know my dog would appreciate a few extra belly rubs too.

(    ) 1. A. tradition           B. culture             C. civilization       D. habit

(    ) 2. A. wealth              B. disaster             C. belief                      D. luck

(    ) 3. A. focus                      B. accuse              C. adapt                D. mind

(    ) 4. A. boil                 B. paint                C. wash                D. purchase

(    ) 5. A. same                B. similar             C. common           D. different

(    ) 6. A. come about       B. take about         C. bring about       D. get out

(    ) 7. A. bore                 B. destroy             C. enjoy                      D. absorb

(    ) 8. A. last                  B. first                 C. second              D. next

(    ) 9. A. play                 B. story                C. novel                      D. history

(    ) 10. A. sharing           B. listening           C. reading             D. making

(    ) 11. A. invention               B. story                C. race                 D. tradition

(    ) 12. A. food                      B. clothes             C. money              D. jewels

(    ) 13. A. unclear           B. unlucky            C. unfair               D. uncertain

(    ) 14. A. wishes            B. signs                C. presents            D. happiness

(    ) 15. A. spend             B. envy                C. buy                  D. celebrate

(    ) 16. A. firecrackers     B. songs                      C. dances              D. goods

(    ) 17. A. take                      B. scare                C. get                   D. burn

(    ) 18. A. fun                B. relax                C. sleep                D. travel

(    ) 19. A. fixed              B. named              C. considered               D. marked

(    ) 20. A. order              B. accompany       C. tease                D. allow