问题 单项选择题

制氢装置中,加氢反应过程的氢油比一般控制体积比为()

A、80~100

B、120~150

C、150~200

D、200~250

答案

参考答案:A

填空题

(7分)今年湛江市化学实验操作考察实验之一是“用高锰酸钾制取氧气”。现摘录某同学的实验过程如下:

选择适当仪器,组装成如图所示的实验装置;

②检查装置气密性,装置气密性良好;

③向集气瓶中加大半瓶水,并倒置于盛有水的水槽中,集气瓶 底部出现气泡;

④将药品平铺于干燥试管底部,在导管口放置蓬松的棉花团,塞上橡皮塞,固定于铁架台上;

⑤点燃酒精灯加热,待导管口有气泡产生,立即用集气瓶进行收集;

⑥气体收集完毕,用毛玻璃片将集气瓶口盖好,从水中取出并正放在桌面上;

⑦先熄灭酒精灯,后将导管从水槽中取出;

请回答下列问题:

(1)写出用高锰酸钾制氧气的文字表达式(或化学符号表达式):               

(2)欲调整试管高度,应调节图中A、B、C哪个旋钮:            

(3)步骤②的操作观察到的现象是:                               ;若装置无破损,加热一段时间后,观察到高锰酸钾已大量分解,但导管口仍未产生明显气泡,可能的原因是                                                                

(4)上述实验步骤中,可能导致集气瓶中收集的氧气不纯净(水蒸气不计)的是      ;(填步骤序号)

(5)步骤⑦中的操作,可能引起                                     

阅读理解

第三部分:阅读理解(共20小题,满分40分)

第一节:阅读下 * * 篇短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。(共15小题,满分30分)

Frank Woolworth was born in Rodman, New York., in 1852. His family were very poor farmers, and there was never enough to eat. Frank decided he did not want to be farmer. He took a short business course, and went to work as a salesman in a large city.

Woolworth realized he had a natural skill for showing goods to attract people’s interest, but he soon learned something more important. One day his boss told him to sell some odds and ends (小商品 ) for as much as he could get. Frank put all these things on one table with a sign which said FIVE CENTS EACH. People fought and pushed to buy the things and the table was soon cleared.

Soon afterwards, Woolworth opened his own store., selling goods at five and ten cents. But he had another lesson to learn before he became successful. That is, if you want to make money by selling low-price goods, you have to buy them in large quantities directly form the factories. Once, for example, Woolworth went to Germany and placed an order for knives. The order was so large that the factory had to keep running 24 hours a day for a whole year. In this way, the price of the knives was cut down by half.

By 1919, Woolworth had over 1000 stores in the US and Canada, and opened his first store in London. He made many millions and his name became famous throughout the world. He always run his business according to strict rules, of which the most important was: “ THE CUSTOMER IS ALWAYS RIGHT.”

51. Frank took a short business course in order to ____________.

A. earn more money for his family    B. learn something from a salesman

C. get away from the farm           D. get enough to eat.

52. Frank sold the odds and ends quickly because _____________.

A. he knew how to get people to buy his goods.     B. he cut down the price by half

C. he had put the goods on a table in a very nice way.

D. the sign he put on the table was well designed.

53. The price of the knives was cut down by half because ______________.

A. the factory workers worked 24 hours a day.

B. knives were ordered in large quantities directly from the factory.

C. the knives were made in Germany, where labour (劳动力) was cheap.

D. the knives were produced in one factory.

54. _____________ make Woolworth a world-famous man.

A. His business skills and his wealth.     B. The low price of the goods he sold.

C. His trip to Germany and his huge order of knives.   

D. His natural skill for showing things.

55. The belief that : “ The customer is always right” suggests that _______________.

A. whenever there is a quarrel between the customer and shop assistant, the customers are always right.

B. If you want to succeed, the rule is the only way.

C. stores must always follow the customer’s orders if they want to make more money.

D. stores should do their best to meet the customer’s needs if they want to be successful.