问题 问答题

(10分)实验室常用下图A与B装置制取气体,回答相关问题:

(1)写出图中标有③的仪器名称:③____________

(2)小高要制取二氧化碳气体,应选择图中的______装置(填字母),该反应的化学方程式_______________________________。

(3)小明要用A装置制取干燥的气体,则瓶①应盛放_______(填序号)。

A.氢氧化钠溶液        B.浓盐酸       C.浓硫酸

(4)写出用B装置制取气体的一个化学反应方程式_____________________________________。

答案

(1)酒精灯(2)A,CaCO3+2HCl=CaCl2+CO2↑+H2O(3)C  (4)2KMnO4="K2MnO4+MnO2+O2"

(1)识别一些简单仪器,故答案味:酒精灯。

(2)二氧化碳的实验室制法中的反应物是碳酸钙和盐酸,并且不用加热,故答案味:A; CaCO3+2HCl=CaCl2+H2O+CO2↑ (注意注明气体符号).

(3)二氧化碳是酸性气体,只能用酸性物质干燥,浓硫酸具有吸水性,故答案为:C   

(4)发生装置是固体和固体加热的装置,收集装置是排水法收集,结合所学知识,氧气符合这套装置;故答案为:2KMnO4="K2MnO4+MnO2+O2" 条件为加热。

单项选择题

Celebrate. Celebrate. Physicians are delighted with a Food and Drug Administration (FDA) advisory panel’s recommendation earlier this year that Vioxx and its cousins Bextra and Celebrex (all medicines known as Cox-2 inhibitors) should remain on the market, despite evidence they increase heart disease risk in some people. The panelists reached their decision after weighing all the data and concluding the benefits of these pain-relieving drugs outweighed the risks.
Specifically, these scientists acknowledged that, for some patients, these prescription drugs were uniquely effective in reducing pain from arthritis and other causes. For others—concerned about ulcers associated with aspirin and other OTC analgesics—the Cox-2 inhibitors offered the advantage of minimizing potentially serious effects of stomach irritation.
Now is an appropriate time for everyone to take a fresh look at the benefit-risk equation for Vioxx and the other Cox-2 inhibitors.
The risks-increased risk of heart disease in some who use the drugs—have been well publicized. Much less publicity has been given to a spectrum of real and potential benefits that go way beyond reduced risk of stomach irritation. These little-discussed benefits would have been lost, perhaps permanently-had Vioxx, Bextra and Celebrex been driven from shelves in pursuit of perfect safety, an unattainable goal.
For example, there is substantial evidence Cox-2 inhibitors can reduce development of colon polyps, which may become colon canceL Indeed. Celebrex is FDA-approved for those genetically prone to colon cancer. Ironically, the 2004 study that revealed the elevated heart attack risk of Vioxx was primarily designed to further establish the drug’s effectiveness in protecting against colon cancer. And while the results of that interrupted trial have not yet been published, there is good reason to believe they will confirm the protective effects against colon cancer established in research over the last 10 years.
At the time of its withdrawal from the market last fall, studies of Vioxx as well as the other Cox-2 drugs suggest that they had other anti-cancer properties as well, possibly reducing the risk of malignancies of a number of sites, including the lung and esophagus.
Had these drugs been dismissed, their untapped promise for prevention would have evaporated well before it was evaluated and applied to save lives. Fortunately, cooler and wiser heads prevailed.

The word "unattainable" underlined in Paragraph 4 is closest in meaning to ______.

A.unrealizable

B.undoable

C.unachievable

D.impossible

多项选择题