问题 实验题

如图所示下列装置,请根据题目要求,回答下列问题

(1)写出仪器①和②的名称 _________ _________

(2)实验室可用高锰酸钾固体或氯酸钾固体等制取氧气.高锰酸钾为 _________ 色固体,氯酸钾为 _________ 色固体.

(3)检验E装置的气密性的方法是_________

(4)利用高锰酸钾固体,制取和收集纯净的氧气,应选择的装置为(填序号)_________,发生反应的文字表示式为__________________

答案

(1) 试管 、 酒精灯 .

(2) 紫黑 ; 白 .

(3) 将导管一端放入烧杯内的水中,双手紧握试管壁,若导管口有气泡冒出,说明装置不漏气 .

(4) A和F, 高锰酸钾锰酸钾+二氧化锰+氧气 .

填空题
单项选择题

Democrats on the Senate Judiciary Committee vented their fury over high gasoline prices at executives of the nation’s five largest oil companies on Wednesday, grilling the oilmen over their multimillion-dollar pay packages and warning them that Congress was intent on taking action that could include a new tax on so-called windfall profits. Such showdowns between lawmakers and oil titans have become a familiar routine on Capitol Hill. But with gas prices nearing $ 4 a gallon, and lawmakers headed home for a weeklong Memorial Day recess where they expect to get an earful from angry constituents, there is added urgency for Congress to appear active.

But while momentum is building for several measures, including a bill that would allow the Organization of the Petroleum Exporting Countries to be sued in American courts under antitrust laws, there is little sign that any of the proposals would do much, if anything, to lower prices quickly. And the oil executives warned that government intervention might only make things worse. Instead, they called on Congress to allow more drilling and exploration for domestic oil.

The increasing urgency to seem aggressive about gasoline prices was apparent on Tuesday when the House voted by an overwhelming 324 to 84 to approve the bill, commonly referred to as NOPEC, which classifies OPEC as a monopoly in violation of the Sherman Antitrust Act. Senate Democrats have included that measure as part of a package of legislation intended to address the high price of gasoline, along with the tax on windfall profits and a measure to tamp down speculation in the oil futures market that many lawmakers think is contributing to the run-up in prices.

At the Judiciary Committee hearing, Democratic senators struggled to have the executives explain how oil prices had risen so high. The senators expressed doubt that basic laws of supply and demand were at work and suggested instead a more sinister combination of monopolistic behavior by oil-producing countries, speculation in the futures markets and sheer corporate greed.

On Monday, President Bush signed a bill temporarily suspending the purchase of crude oil for the nation’s Strategic Petroleum Reserve. Mr. Bush had initially opposed such action but relented after the House and Senate approved the bill by wide margins. Senator Richard J. Durbin, Democrat of Illinois and a p supporter of Senator Baraek Obama’s presidential bid, made a particularly pointed attack, in which he seemed to warn the oil executives that they would soon no longer have such a good friend in the White House. He also suggested that Mr. Bush should be doing more to press the oil companies to help lower prices at the pump, while acknowledging that it would be difficult to pass a windfall profits tax while Mr. Bush was still in office.

Senate Democrats were angry with the oilmen because()

A. they get tax-free pay packages

B. Congress took on actions but in vain

C. the showdowns were merely a routine

D. oil prices had risen so high