...arge, whereas the other atom gets a partial positive charge. Then the bond becomes a polar covalent bond. When this molecule meets another molecule that has a dipole moment like this, the negative and positive charges tend to attract each other. And, this attraction force is called a hydrogen bond. ...
...imal peptide bonds. This means the COOH group of C terminal of the peptide becomes COCH3 while the NH2 group of N terminal becomes NHCH3. Ex: alanine dipeptide is CH3CONHCH(CH3)CONHCH3. 二肽是水解酶作用的结果,即二肽基肽酶。在我们的胃肠道内,食物中的蛋白质消化...
什么是债券(a bond)? 债券是以借款为目的,在一定期限内发行的金融工具。债券发行时,向持有人承诺,在规定的日期,按照预定的利率(票面利率)支付固定金额的利息,通常为半年、一年等,直至债券到期并在到期...
...t is the strongest type of chemical bond that exists. In liquid form, they become excellent conducting materials as the i*** are free to travel. I*** can be atomic or molecular in nature. i.e. CO32- is a molecular anion. In the case of H+ (Hydrogen) being the cation, the compound is called an acid a...
...数。 这篇文章解释道, 1.什么是粘结顺序和粘结长度 2.如何计算债券顺序和债券长度-如何计算债券顺序-如何计算债券长度 什么是键顺序和键长(bond order and bond length)? 键长和键序是与共价键相关的两个参数。键序是两个原子之...
...ic bonds)? Certain atoms tend to donate or receive electr*** in order to become more stable by completely occupying their outermost orbit. Atoms with very few electr*** in their outermost shell tend to donate the electr*** and become positively charged i***, while atoms with more electr*** in thei...
在化学学科中,一个人需要学习并有一个了解化学键如何工作的内在机制。键的字面定义是通过与原子相互作用来保持原子之间的结合。化学键又可分为许多种,如共价键和极性键。两个主要的化学键是Sigma键和Pi键。西格玛键(s...
...即时联系的机会。有关在新城市生活的其他建议,请查看如何充分利用你的新城市。如何在任何一个新城市结交新朋友[Lifehack.org]
...席演讲主题建议 为什么习惯或常规有用习惯或例行公事如何导致无聊? 天气如何影响你的情绪? 为什么你最喜欢的球队在上一场比赛、比赛或竞争中赢了或输了? 你为什么要找新工作? 是什么让你分手/结束了上一段关系? ...
π键(π键)是两个相邻原子的无键p轨道之间形成的共价键。 一个原子中的未束缚p轨道电子与相邻原子的未束缚平行p轨道电子形成电子对。这个电子对形成π键。 原子间的双键和三键通常由一个西格玛键和一个或两个π键...