题目

在不同的条件下进行合成氨反应,N2 (g)+3H2 (g)2NH3(g),根据下列在相同时间内测得的结果判断,生成氨的反应速率最快的是()A. v(NH3)=0.1mol/(L·min) B. v(NH3)=0.2mol/(L·min)C. v(N2)=0.3mol/(L·min) D. v(H2)=0.4mol/(L·min) 答案：【答案】C【解析】化学反应速率之比等于相应的化学计量数之比，根据方程式N2+3H22NH3可知如果都用氢气表示反应速率，A为0.15 mol/（L·min）、B为0.3 mol/（L·min）、C为0.9mol/（L·min）、D为0.4 mol/（L·min），所以反应速率最快的是C；答案选C。完形填空 （每小题1分，共10分）根据短文内容，从各题的四个选项中选出一个最佳答案，使短文完整、正确，并将符合题意的选项用2B铅笔涂在答题卡的相应位置上.Many people go to school for an education. They learn languages, history, geography, physics, chemistry and math. Others go to school to learn a skill _ _ they can make a living. School education is very important and useful, but no one can learn_ _ from school. A teacher, no matter how much he_ _, can’t teach his students everything they want to know. The teacher’s job is to show his students how to read and _ to think. So much more is to be learned out of school _ _ the students themselves.It is always more important to know how to study by oneself than to memorize some _ _ or formulas (公式). It is actually quite _ _ to learn a certain fact in history or a formula in mathematics. But it is very difficult to use a formula in _ _ a math problem. Great scientists, such as Einstein, Newton and Galileo, didn’t learn many things from school, but they were all _ _ _ and invented many things for mankind.The _ _ for their success is that they knew how to study. They read books that were not taught at school. They worked hard all their lives, wasting not a single moment. They would ask many questions as they read and they did thousands of experiments.1.A. even if B. so that C. because D. once2.A. everything B. something C. anything D. nothing3.A. teaches B. knows C. learns D. practices4.A. what B. which C. how D. why5.A. by B. with C. on D. in6.A. meanings B. books C. history D. facts7.A. necessary B. easy C. different D. common8.A. setting about B. working out C. making up D. doing with9.A. criminals B. popular C. successful D. patient10.A. experiment B. reason C. result D. way