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问题 填空题

一氧化碳与水蒸气的反应为：CO(g) + H2O(g)CO2(g)+H2(g) 在密闭容器中，将1.0 mol CO与1.0mol

H2O混合加热到434℃，在434℃的平衡常数K1 =9

（1）跟踪测定H2O的物质的量浓度，如图所示，则0-20min，H2O的反应速率是____________。

（2）请在图中用实线绘制出在该温度下加入正催化剂后，H2O的物质的量浓度变化图线。

（3）从434℃升温至800℃，800℃的平衡常数K2=1，则正反应为________（填“放热反应”或“吸热反应”或“不能确定”）。

（4）求在800℃反应达平衡时，CO转化为CO2的转化率（写出必要的计算过程）

答案

（1）4.5×10-4 mol/(L·min)　

（2）

（3）放热反应　

（4）50

单项选择题

参与蛋白质合成的核苷酸是（）。

A.CTP

B.UTP

C.GTP

D.ADP

E.GMP
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单项选择题

Drug use is rising dramatically among the nation’ s youth after a decade of decline. From 1993 to 1994, marijuana use among young people (1) from 12 to 17 jumped 50 percent. One in five high school seniors (2) marijuana daily. Monitoring the Future, which (3) student drug use annually, reports that negative attitudes about drugs have declined for the fourth year in a row. (4) young people see great risk in using drugs. Mood-altering pharmaceutical drugs are (5) new popularity among young people. Ritalin, (6) as a diet pill in the 1970s and now used to (7) hyperactive children, has become a (8) drug on college campuses. A central nervous system (9) , Ritalin can cause strokes, hypertension, and seizures. Rohypnol, produced in Europe as a (10) tranquilizer, lowers inhibitions and suppresses short-term memory, which has led to some women being raped by men they are going out with. (11) taken with alcohol, its effects are greatly (12) . Rock singer Kurt Cobain collapsed from an (13) of Rohypnol and champagne a month before he committed (14) in 1994. In Florida and Texas, Rohypnol has become widely abused among teens, who see the drug as a less expensive (15) for marijuana and LSD. Alcohol and tobacco use is increasing among teenagers, (16) younger adolescents. Each year, more than one million teens become regular smokers, (17) they cannot legally purchase tobacco. By 12th grade, one in three students smokes. In 1995, one in five 14-year-olds reported smoking regularly, a 33 percent jump (18) 1991. Drinking among 14-year-olds climbed 50 percent from 1992 to 1994,and all teens reported substantial increases in (19) drinking. In 1995, one in five 10th graders reported having been drunk in the past 30 days. Two-thirds of high school seniors say they know a (20) with a drinking problem.

17（）

A. even though

B.as if

C. as long as

D. as soon as
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