Which of the following is the main idea of the passage? A. Evolution has equipped all creatures with a regular pattern of sleeping and walking B. The study of the sleep is an important part of the evolutionary theory C. Sleeping pattern must be taken into consideration in the designing of the robot D. The sleeping pattern of a living creature is determined by the food it eats C Ask any person who is successful in whatever he or she is doing what motivates him/her, and very likely the answer will be "goals". Goal Setting is extremely important to motivation and success. So what motivates you? Why are you in college? If you are in college because that's what your parents want, you may find it difficult to motivate yourself. Sure, it's possible to succeed with someone else providing the motivation for you. ("If you graduate from college, I'll give you a car!" or worse "If you don't graduate from college, you won't get a car.") But motivation that comes from within really makes the difference. Certainly, you need some intelligence, knowledge base, study skills, and time management skills, but if you don't have motivation, you won't get far. Think about this analogy. You have a car with a full tank of gas, a well-tuned engine, good set of tires, quadraphonic CD system, and a sleek, polished exterior. There it sits. This car has incredible potential. However, until a driver sits behind the wheel, puts the key in the ignition, and cranks it up, the car doesn't function. You guessed it; the KEY is MOTIVATION. Interest is an important motivator for a student. So is a desire to learn. When you link these two things together, you create success. Often success in an endeavor leads to more interest and a greater desire to learn, creating an upward spiral of motivation toward a goal you have established. So be honest with yourself. Are you genuinely interested in being in college? Have you set realistic goals for yourself? How can you develop the internal motivation that really counts? When it comes to motivation, KNOWING is not as important as DOING. 查看更多

 

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1898年,IUPAC(International Union of Pure and Applied Chemistry,国际纯粹与应用化学联合会)建议用1~18列代替原周期表中主族、副族序号,请问原第IVA族应该在第几列?(  )
A、第4列B、第14列C、第5列D、第15列

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中国科技大学的研究人员于2010年9月14日宣布,验证了通过电化学催化重整方法,可从生物油有效地生产氢气.这一工作成果已发布在《中国化学物理杂志(Chinese Journal of Chemical Physics)》上.下列有关电化学的示意图中正确的是(  )

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2011年被联合国大会定为“国际化学年”(International Year of Chemistry),以表彰化学学科所取得的成就以及对人类文明的贡献.下列说法正确的是(  )

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2011年被联合国大会定为“国际化学年”(International Year of Chemistry),以表彰化学学科所取得的成就以及对人类文明的贡献.下列说法正确的是(  )

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长期以来一直认为氟的含氧酸不存在.但是至1971年斯图杰尔和阿佩里曼(美)成功地合成了次氟酸后,这种论点被剧烈地动摇了.他们是在0℃以下将氟化物从细冰末的上面通过,得到毫克量的次氟酸.
(1)以下两种结构式,能正确表示次氟酸结构的是
A
A
.A、H-O-F    B、H-F-O
(2)次氟酸中氧元素的化合价为
0
0
,次氟酸的电子式为
,次氟酸分子中共价键的键角
180°(填“<”或“=”).
(3)下面给出了几个分子和基团化学键的键能:
H2 O2 F2 OH OF HF
E/(kJ/mol) 432 494 155 424 220 566
请计算反应 2HOF(g)=2HF(g)+O2(g)的反应热(△H),近似为
-338
-338
kJ/mol.从计算结果预测次氟酸的一条化学性质:
具有强氧化性
具有强氧化性

(4)次氟酸能被热水瞬间分解,生成一种常见的物质M,M是18e-,且被称为“绿色氧化剂”.写出次氟酸与热水反应的化学方程式:
HOF+H2O=△=HF+H2O2
HOF+H2O=△=HF+H2O2

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