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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，國際純粹與應(yīng)用化學(xué)聯(lián)合會(huì)）建議用1～18列代替原周期表中主族、副族序號(hào)，請問原第IVA族應(yīng)該在第幾列？（　�。�
A、第4列B、第14列C、第5列D、第15列

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中國科技大學(xué)的研究人員于2010年9月14日宣布，驗(yàn)證了通過電化學(xué)催化重整方法，可從生物油有效地生產(chǎn)氫氣．這一工作成果已發(fā)布在《中國化學(xué)物理雜志（Chinese Journal of Chemical Physics）》上．下列有關(guān)電化學(xué)的示意圖中正確的是（　�。�

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2011年被聯(lián)合國大會(huì)定為“國際化學(xué)年”（International Year of Chemistry），以表彰化學(xué)學(xué)科所取得的成就以及對人類文明的貢獻(xiàn)．下列說法正確的是（　�。�

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2011年被聯(lián)合國大會(huì)定為“國際化學(xué)年”（International Year of Chemistry），以表彰化學(xué)學(xué)科所取得的成就以及對人類文明的貢獻(xiàn)．下列說法正確的是（　　）

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長期以來一直認(rèn)為氟的含氧酸不存在．但是至1971年斯圖杰爾和阿佩里曼（美）成功地合成了次氟酸后，這種論點(diǎn)被劇烈地動(dòng)搖了．他們是在0℃以下將氟化物從細(xì)冰末的上面通過，得到毫克量的次氟酸．
（1）以下兩種結(jié)構(gòu)式，能正確表示次氟酸結(jié)構(gòu)的是
A
A
．A、H-O-F    B、H-F-O
（2）次氟酸中氧元素的化合價(jià)為
0
0
，次氟酸的電子式為
，次氟酸分子中共價(jià)鍵的鍵角
＜
＜
180°（填“＜”或“=”）．
（3）下面給出了幾個(gè)分子和基團(tuán)化學(xué)鍵的鍵能：
H2 O2 F2 OH OF HF
E/（kJ/mol） 432 494 155 424 220 566
請計(jì)算反應(yīng)　2HOF（g）=2HF（g）+O2（g）的反應(yīng)熱（△H），近似為
-338
-338
kJ/mol．從計(jì)算結(jié)果預(yù)測次氟酸的一條化學(xué)性質(zhì)：
具有強(qiáng)氧化性
具有強(qiáng)氧化性
．
（4）次氟酸能被熱水瞬間分解，生成一種常見的物質(zhì)M，M是18e-，且被稱為“綠色氧化劑”．寫出次氟酸與熱水反應(yīng)的化學(xué)方程式：
HOF+H2O=△=HF+H2O2
HOF+H2O=△=HF+H2O2
．

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